BiVO_(4)is one of the most promising photoanode materials for photoelectrochemical(PEC)solar energy conversion,but it still suffers from poor photocurrent density due to insufficient light‐harvesting efficiency(LHE),...BiVO_(4)is one of the most promising photoanode materials for photoelectrochemical(PEC)solar energy conversion,but it still suffers from poor photocurrent density due to insufficient light‐harvesting efficiency(LHE),weak photogenerated charge separation efficiency(Φ_(Sep)),and low water oxidation efficiency(Φ_(OX)).Herein,we tackle these challenges of the BiVO_(4)photoanodes using systematic engineering,including catalysis engineering,bandgap engineering,and morphology engineering.In particular,we deposit a NiCoO_(x)layer onto the BiVO_(4)photoanode as the oxygen evolution catalyst to enhance theΦ_(OX)of Fe‐g‐C_(3)N_(4)/BiVO_(4)for PEC water oxidation,and incorporate Fe‐doped graphite‐phase C_(3)N_(4)(Fe‐g‐C_(3)N_(4))into the BiVO_(4)photoanode to optimize the bandgap and surface areas to subsequently expand the light absorption range of the photoanode from 530 to 690 nm,increase the LHE andΦ_(Sep),and further improve the oxygen evolution reaction activity of the NiCoO_(x)catalytic layer.Consequently,the maximum photocurrent density of the as‐prepared NiCoO_(x)/Fe‐g‐C_(3)N_(4)/BiVO_(4)is remarkably boosted from 4.6 to 7.4 mA cm^(−2).This work suggests that the proposed systematic engineering strategy is exceptionally promising for improving LHE,Φ_(Sep),andΦ_(OX)of BiVO_(4)‐based photoanodes,which will substantially benefit the design,preparation,and large‐scale application of next‐generation high‐performance photoanodes.展开更多
As one of the most common cathode materials for aqueous zinc-ion batteries(AZIBs),manganese oxides have the advantages of abundant reserves,low cost,and low toxicity.However,the electrochemical mechanism at the cathod...As one of the most common cathode materials for aqueous zinc-ion batteries(AZIBs),manganese oxides have the advantages of abundant reserves,low cost,and low toxicity.However,the electrochemical mechanism at the cathode of aqueous zinc-manganese batteries(AZMBs) is complicated due to different electrode materials,electrolytes and working conditions.These complicated mechanisms severely limit the research progress of AZMBs system and the design of cells with better performance.Hence,the mechanism of AZMBs currently recognized by most researchers according to the classification of the main ions involved in the faradaic reaction is introduced in the review.Then a series of reasons that affect the electrochemical behavior of the battery are summarized.Finally,the failure mechanisms of AZMBs over prolonged cycling are discussed,and the current insufficient research areas of the system are explained,along with the direction of further research being prospected.展开更多
TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and th...TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and therefore reduce the lightening power of TiO2. In the present work, a uniform, amorphous, 2.9-nm-thick TiO2 protective layer was deposited onto the surface of anatase TiO2 pigments according to pulsed chemical vapor deposition at room temperature, with Ti Cl4 as titanium precursor. Amorphous TiO2 coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO2 coating with amorphous SiO2 and SnO2 layers. However, the lightening power of amorphous TiO2 layer is higher than those of amorphous SiO2 and SnO2 layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity.展开更多
The lithiated covalent organic framework(named TpPa-SO_(3) Li),which was prepared by a mild chemical lithiation strategy,was introduced in poly(ethylene oxide)(PEO)to produce the composite polymer electrolytes(CPEs).L...The lithiated covalent organic framework(named TpPa-SO_(3) Li),which was prepared by a mild chemical lithiation strategy,was introduced in poly(ethylene oxide)(PEO)to produce the composite polymer electrolytes(CPEs).Li-ion can transfer along the PEO chain or across the layer of TpPa-SO_(3) Li within the nanochannels,resulting in a high Li-ion conductivity of3.01×10^(-4)S/cm at 60℃.When the CPE with 0.75 wt.%TpPa-SO_(3) Li was used in the LiFePO_(4)‖Li solid-state battery,the cell delivered a stable capacity of 125 mA·h/g after 250 cycles at 0.5 C,60℃.In comparison,the cell using the CPE without TpPa-SO_(3) Li exhibited a capacity of only 118 mA·h/g.展开更多
Up to now,three kinds of ion-storage mechanisms are summarized towards anode materials in lithium/sodium-ion batteries,but they have low capacity and poor cyclic performance.Therefore,it is necessary to develop a new ...Up to now,three kinds of ion-storage mechanisms are summarized towards anode materials in lithium/sodium-ion batteries,but they have low capacity and poor cyclic performance.Therefore,it is necessary to develop a new approach to optimize ion storage.Herein,we report an adsorption/desorption storage route through engineering electronic structure of cation-deficient Ti_(1-x)O_(2)nanosheets.Ti_(1-x)O_(2)nanosheets indeed exhibit higher capacity(332.1 mA h g^(-1)vs.137.7 mA h g^(-1)for LIBs,195.7 mA h g^(-1)vs.111 mA h g^(-1)for SIBs),and more stable cyclic performance(296 mA h g^(-1)vs.99 mA h g^(-1)for LIBs,178.1 mA h g^(-1)vs.80.2 mA h g^(-1)for SIBs after 100 cycles)at 0.1 A g^(-1)than TiO_(2)nanosheets.Kinetics analysis and density functional theory(DFT)calculations reveal that electronic structures of vacancy within Ti_(1-x)O_(2) nanosheets encourage a novel adsorption-desorption storage route.These results highlight the benefits of the engineered electronic structures within electrode material and implement novel ion-storage mechanism towards broad energy storage applications.展开更多
Bi VO_(4)is a promising semiconducting photoanode for photoelectrochemical(PEC)water splitting due to its suitable bandgap.However,the dissolution of V^(5+)and sluggish reaction kinetics at the surface in the oxygen e...Bi VO_(4)is a promising semiconducting photoanode for photoelectrochemical(PEC)water splitting due to its suitable bandgap.However,the dissolution of V^(5+)and sluggish reaction kinetics at the surface in the oxygen evolution reaction(OER)limit its applications.Herein,we report a convenient strategy to change the microenvironment by adding Fe(Ⅲ)into the electrolyte.During the PEC process,Fe(Ⅲ)ions not only improve the current density,but also show excellent stability toward Bi VO_(4).Consequently,the current increases by more than 1.7 times compared to that without Fe(Ⅲ).Photoelectrochemical,morphological,and structural characterizations reveal that the FeOOH co-catalyst produced in situ on the Bi VO_(4)photoanode by cyclical formation of the intermediates at the electrode/electrolyte interface during OER accelerates the OER kinetics and prevents photo-corrosion by suppressing the dissolution of V^(5+).The results reveal a new strategy for the multifunctional modification of photoanodes for efficient solar conversion.展开更多
Amorphous carbons are promising anodes for high-rate potassium-ion batteries.Most low-temperature annealed amorphous carbons display unsatisfactory capacities.Heteroatom-induced defect engineering of amorphous carbons...Amorphous carbons are promising anodes for high-rate potassium-ion batteries.Most low-temperature annealed amorphous carbons display unsatisfactory capacities.Heteroatom-induced defect engineering of amorphous carbons could enhance their reversible capacities.Nevertheless,most lignocellulose biomasses lack heteroatoms,making it a challenge to design highly heteroatom-doped carbons(>10 at%).Herein,we report a new preparation strategy for amorphous carbon anodes.Nitrogen/sulfur co-doped lignin-derived porous carbons(NSLPC)with ultra-high nitrogen doping levels(21.6 at%of N and 0.8 at%of S)from renewable lignin biomacromolecule precursors were prepared through a supramolecule-mediated pyrolysis strategy.This supermolecule/lignin composite decomposes forming a covalently bonded graphitic carbon/amorphous carbon intermediate product,which induces the formation of high heteroatom doping in the obtained NSLPC.This unique pyrolysis chemistry and high heteroatom doping of NSLPC enable abundant defective active sites for the adsorption of K+and improved kinetics.The NSLPC anode delivered a high reversible capacity of 419 mAh g^(-1)and superior cycling stability(capacity retention of 96.6%at 1 A g^(-1)for 1000 cycles).Potassiumion hybrid capacitors assembled by NSLPC anode exhibited excellent cycling stability(91%capacity retention for 2000 cycles)and a high energy density of 71 Wh kg^(-1)at a power density of 92 W kg^(-1).展开更多
A novel coronavirus of zoonotic origin(SARSCoV-2)has recently been recognized in patients with acute respiratory disease.COVID-19 causative agent is structurally and genetically similar to SARS and bat SARS-like coron...A novel coronavirus of zoonotic origin(SARSCoV-2)has recently been recognized in patients with acute respiratory disease.COVID-19 causative agent is structurally and genetically similar to SARS and bat SARS-like coronaviruses.The drastic increase in the number of coronavirus and its genome sequence have given us an unprecedented opportunity to perform bioinformatics and genomics analysis on this class of viruses.Clinical tests like PCR and ELISA for rapid detection of this virus are urgently needed for early identification of infected patients.However,these techniques are expensive and not readily available for point-of-care(POC)applications.Currently,lack of any rapid,available,and reliable POC detection method gives rise to the progression of COVID-19 as a horrible global problem.To solve the negative features of clinical investigation,we provide a brief introduction of the general features of coronaviruses and describe various amplification assays,sensing,biosensing,immunosensing,and aptasensing for the determination of various groups of coronaviruses applied as a template for the detection of SARS-CoV-2.All sensing and biosensing techniques developed for the determination of various classes of coronaviruses are useful to recognize the newly immerged coronavirus,i.e.,SARS-CoV-2.Also,the introduction of sensing and biosensing methods sheds light on the way of designing a proper screening system to detect the virus at the early stage of infection to tranquilize the speed and vastity of spreading.Among other approaches investigated among molecular approaches and PCR or recognition of viral diseases,LAMP-based methods and LFAs are of great importance for their numerous benefits,which can be helpful to design a universal platform for detection of future emerging pathogenic viruses.展开更多
Hard carbon is considered as the most commercially applicable anode for sodium-ion batteries.Lignin has the characteristics of sustainable,low cost,high carbon content(>60%)and abundant oxygen functional groups,whi...Hard carbon is considered as the most commercially applicable anode for sodium-ion batteries.Lignin has the characteristics of sustainable,low cost,high carbon content(>60%)and abundant oxygen functional groups,which is expected to be used as a promising candidate precursor for low-cost hard carbons.The structure and electrochemical performances of hard carbons could be regulated by adjusting carbonization temperature.The microstructure and electrochemical performance of LDHC anode are highly dependent on the carbonization tem-perature.Increasing carbonization temperature could reduce specific surface area and improve initial coulombic efficiency.The slope and plateau capacity of the LDHC anode could also be adjusted by changing the carboniza-tion temperature.The LDHC prepared at 1200℃showed the best sodium-ion storage performance,with an initial coulombic efficiency of 78.9%and a reversible sodium-ion storage capacity of 284.7 mAh g^(−1).展开更多
Bimetallic nanoparticles exhibit a synergistic effect that critically depends on their surface composition,but such promotion mechanisms become vague with varying surface compositions.Here,alumina supported Ag@Pd core...Bimetallic nanoparticles exhibit a synergistic effect that critically depends on their surface composition,but such promotion mechanisms become vague with varying surface compositions.Here,alumina supported Ag@Pd core–shell and PdAg alloy structure with controlled size and surface compositions were prepared to demonstrate synergetic mechanisms,particularly,ligand and strain effects on activity and ethylene selectivity for acetylene hydrogenation.The performance evaluation indicates that Ag@Pd catalysts with well-controlled Pd-shell thickness can effectively lower apparent activation energy and improve ethylene selectivity.Hydrogenation activity increases from 0.019 to 0.062 s^(-1) with decreasing Pd-shell thickness under mild conditions,which is 3–6 times higher than their alloyed and monometallic counterparts.Combined characterizations and density functional theory are conducted to reveal such shell-thickness-dependent performance.The ligand effect arising from Ag alloying in the interface of Ag@Pd2ML observes the strongest binding of acetylene,but it diminished sharply and the strain effect gets more prevailing with increasing shell thickness.The competition of ethylene desorption and deephydrogenation were also investigated to understand the selectivity governing factors,and the selectivity descriptor(0.5BE(C_(2)H_(4))–BE(H))was built to match the contribution of ligand and strain effect on the different surfaces of Pd-Ag bimetallic NPs.The exploration of synergetic mechanisms among bimetallic NPs with varied structure and surface compositions in this work can help us to deepen the understanding catalyst structure–activity relationship and provide a feasible way to optimize the overall catalytic performance.展开更多
In recent years,metal phosphosulfides have attracted great attention as the promising anode materials in sodium/potassium batteries because of their incorporation of the advantages of metal phosphides and sulfides.How...In recent years,metal phosphosulfides have attracted great attention as the promising anode materials in sodium/potassium batteries because of their incorporation of the advantages of metal phosphides and sulfides.However,they are also confronted with the problem of unstable battery performance due to the heavy volume expansion and sluggish ion reaction kinetics.Herein,yolk-shell cobalt phosphosulfide nanocrystals encapsulating into multi-heterogeneous atom(N,P,S)-doped carbon framework(Co_(9)S_(8)/CoP@NPSC)were constructed by employing dodecahedral ZIF-67 as precursor and a polymer as carbon sources through simultaneous sulfidation and phosphorization processes.The synergistic effect of Co_(9)S_(8)and CoP component and the yolk-shell structure greatly improve the bettery performance and structural stability.In addition,the multiple hetero-atoms doped carbon frameworks enhance the conductivity of the electrode materials and increase the spacing of carbon layers to supply sufficient active sites and facilitate the Na^(+)/K^(+)transport.The electrochemical results demonstrated that Co_(9)S_(8)/CoP@NPSC exhibited the pleasant reversible capacity(360.47 mAh/g at 1 A/g)after 300 cycles and an unpredictable cycling stability(103.22 mAh/g after 1000 cycles)in the SIBs application.The ex-situ XRD and XPS analyses were further applied to study the sodium ion storage mechanism and the multi-step phase transition reaction of the yolk-shell heterogeneous structure.This work provides new perspectives for the preparation of novel structure metal phosphosulfide and their applications in anode materials for sodium/potassium batteries and other secondary batteries.展开更多
The graded density impactor(GDI)dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons.The accuracy and timeliness of GDI structural design are key to ...The graded density impactor(GDI)dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons.The accuracy and timeliness of GDI structural design are key to achieving controllable stress-strain rate loading.In this study,we have,for the first time,combined one-dimensional fluid computational software with machine learning methods.We first elucidated the mechanisms by which GDI structures control stress and strain rates.Subsequently,we constructed a machine learning model to create a structure-property response surface.The results show that altering the loading velocity and interlayer thickness has a pronounced regulatory effect on stress and strain rates.In contrast,the impedance distribution index and target thickness have less significant effects on stress regulation,although there is a matching relationship between target thickness and interlayer thickness.Compared with traditional design methods,the machine learning approach offers a10^(4)—10^(5)times increase in efficiency and the potential to achieve a global optimum,holding promise for guiding the design of GDI.展开更多
Sodium-ion batteries(SIBs)have emerged as a promising alternative to commercial lithium-ion batteries be-cause of the similar properties of Li and Na as well as the abundance and accessibility of sodium resources.The ...Sodium-ion batteries(SIBs)have emerged as a promising alternative to commercial lithium-ion batteries be-cause of the similar properties of Li and Na as well as the abundance and accessibility of sodium resources.The devel-opment of anode materials with a high capacity,excellent rate performance,and long cycle life is the key to the indus-trialization of SIBs.Biomass-derived carbon(BDC)anode materials synthesized from resource-rich,low-cost,and re-newable biomass have been extensively researched and their excellent sodium storage performance has been proven,making them the most promising new low-cost and high-performance anode material for SIBs.This review first intro-duces the sources of BDCs,including waste biomass such as plants,animals,and microorganisms,and then describes sev-eral methods for preparing BDC anode materials,including carbonization,chemical activation,and template methods.The storage mechanism and kinetic process of Na^(+)in BDCs are then considered as well as their structure control.The electrochemical properties of sodium-ion storage in BDCs with different structures are examined,and suggestions for future re-search are made.展开更多
Sodium-ion batteries are receiving more and more attention due to their low cost and abundant sodium storage capacity,and are considered to be a promising alternative to lithium-ion batteries.A large number of studies...Sodium-ion batteries are receiving more and more attention due to their low cost and abundant sodium storage capacity,and are considered to be a promising alternative to lithium-ion batteries.A large number of studies have shown that constructing heterostructures are considered an effective strategy to solve the hysteresis problem of electronic and ion dynamics in sodiumion battery anode materials.Herein,a nickel-cobalt bimetallic coordination polymer(NiCoCP)was synthesized using a coprecipitation method,and a CoSe_(2)@NiSe_(2) cross-stacked structure was obtained through high-temperature carbonization and selenization processes.CoSe_(2)@NiSe_(2) has a unique heterostructure and carbon film,which synergistically increases a large number of adsorption sites and alleviates the diffusion energy barrier,thereby improving the rapid diffusion kinetics of Na^(+)ions.It has superior rate performance and long-lasting cycle life.For sodium-ion batteries(SIBs),the specific capacity of CoSe_(2)@NiSe_(2) is around 460 mA h g^(-1) after 400 cycles at 1.0 A g^(-1).For potassium-ion batteries(PIBs),CoSe_(2)@NiSe_(2) also exhibits excellent cycling stability,maintaining a specific capacity of 160 mA h g^(-1) after 700 cycles at 1.0 A g^(-1).This study provides a new way to prepare metal selenide heterostructure as the promising anode material for SIBs.展开更多
Magnesium-based hydrogen storage materials are gaining significant attention due to their high hydrogen storage capacity and abundant availability.However,they encounter challenges,including slow hydrogen absorption a...Magnesium-based hydrogen storage materials are gaining significant attention due to their high hydrogen storage capacity and abundant availability.However,they encounter challenges,including slow hydrogen absorption and desorption kinetics and elevated operating temperatures.To address these issues,researchers have employed two main strategies:nanostructuring and the introduction of catalysts.This review provides a comprehensive overview of recent advancements in the modification of MgH_(2),emphasizing the impact of nanostructuring on enhancing hydrogen storage performance.It also examines the role of various catalysts,including carbon-based materials,transition metals and alloys,their oxides and halides,and composites,in improving hydrogen absorption and desorption characteristics.Studies indicate that these modifications can substantially lower the hydrogen absorption and desorption temperatures while enhancing kinetic performance.Furthermore,the effectiveness of catalysts is influenced by their type,dispersion,and interaction with magnesium-based materials and the catalytic mechanism,thereby elucidating the underlying catalytic mechanisms.The review concludes by discussing the current challenges and future directions in this field,aiming to provide theoretical insights for the practical application of magnesium-based hydrogen storage materials.展开更多
With the development of vanadium redox flow battery technology,the demand for pure vanadium is rapidly increasing.The separation of vanadium from vanadium-chromium leaching solutions are critical step in the productio...With the development of vanadium redox flow battery technology,the demand for pure vanadium is rapidly increasing.The separation of vanadium from vanadium-chromium leaching solutions are critical step in the production of purity-vanadium.This study presents an innovative adsorption process that utilizes amorphous ZrO_(2)(AZrO) for the selective separation of V(Ⅴ) and Cr(Ⅵ).In this process,a high adsorption capacity for V(V) at 64.5 mg·g^(-1) was achieved,while the capacity for Cr(Ⅵ) is relatively low at 24.1 mg·g^(-1),demonstrating good separation performance.This is mainly caused by the large specific surface area and mesoporous structure,which are favorable for molecular diffusion and mass transfer.The kinetic analysis shows that the adsorption process follows pseudo-second-order kinetic process with chemisorption being the rate-controlling process.AZrO showed excellent separation performance in mixed solutions over a wide range of concentrations.After five cycles,AZrO retained over 73% of its capacity,indicating good stability.In mixed solutions containing up to 40 g·L^(-1) of V(Ⅴ) and 3 g·L^(-1) of Cr(Ⅵ),the innovative adsorption process successfully achieved effective separation and purification.By an adsorption-desorption process using 0.1 mol·L^(-1) NaOH,a 99.02% V(Ⅴ)-rich solution was obtained from a high concentration sodium vanadium slag leaching solution,demonstrating its effectiveness for practical industrial applications.展开更多
The Bama diet(BD),Mediterranean diet(MD),and Japanese diet(JD)are three typical dietary patterns from distinct geographical regions.The aim of this study was to compare the efficacy of three diets in preventing coliti...The Bama diet(BD),Mediterranean diet(MD),and Japanese diet(JD)are three typical dietary patterns from distinct geographical regions.The aim of this study was to compare the efficacy of three diets in preventing colitis through gut microbe-metabolite-mediated regulatory mechanisms.This was achieved by integrating gut microbiome and metabolomics analyses.Results showed that BD could significantly increase the level of interleukin 10(IL-10),which has the potential to modulate the intestinal immune response.This was achieved by modulating the a-linoleic acid metabolism and promoting Akkermansia proliferation.MD elevated IL-10 level and increased the expression of tight junction proteins such as occludin,claudin-1,and zonula occludens-1.This effect might be attributed to the increased abundance of bifidobacteria,which impacted the primary bile acid biosynthesis pathway.JD decreased tumor necrosis factorαlevel and increased IL-10 level.This could be due to JD promoting the enrichment of Faecalibacterium,which affected the metabolism of arachidonic acid.Furthermore,the anti-inflammatory effects of the different metabolites,namely a-linoleic acid,cholic acid,and arachidonic acid,were confirmed using the RAW264.7 cellular inflammation model.展开更多
Oxygen vacancy engineering is a valid strategy to boost the oxygen reduction reaction(ORR) performance of nanostructured electrocatalysts.Current methods for generating surface oxygen vacancies(Vos) in nanostructured ...Oxygen vacancy engineering is a valid strategy to boost the oxygen reduction reaction(ORR) performance of nanostructured electrocatalysts.Current methods for generating surface oxygen vacancies(Vos) in nanostructured MnO_(2) is mostly lab-scale,which cannot meet the requirement of large-scale production.Herein,we employed a mechanochemical method of ball milling to introduce surface Vos into the β-MnO_(2) nanoparticles.The ball milling process generated abundant surface Vos,which significantly facilitated the adsorption and activation of O_(2).Consequently,the ORR performance of ball-milled β-MnO_(2) was markedly boosted by varying the ball milling time.As an air cathode catalyst for zinc-air battery(ZAB),the β-MnO_(2) ball-milled for 4 h displayed a high specific capacity of 804 mA·h·g^(-1) and excellent cycling over 500 h at 5 mA·cm^(-2),which were superior than those of pristine β-MnO_(2)-based ZAB.Our work offers a feasible strategy to enhance electrocatalytic ORR performance of MnO_(2),which shows significant potential for large-scale production of efficient ORR electrocatalysts.展开更多
The dynamic kinetic resolution(DKR)process remains a highly efficacious approach for constructing chiral amino alcohols via the catalytic asymmetric hydrogenation ofα-amino ketones.We report herein a highly efficient...The dynamic kinetic resolution(DKR)process remains a highly efficacious approach for constructing chiral amino alcohols via the catalytic asymmetric hydrogenation ofα-amino ketones.We report herein a highly efficient and enantioselective anti-selective dynamic kinetic asymmetric hydrogenation ofα-amino ketones catalyzed by Ir-(S)-f-phamidol system,providing various chiral amino alcohols and chiral oxazolidin-2-ones divergently with high diastereo-and enantioselectivity(up to 99%yield,up to 99%ee and up to 99:1 dr).In addition,the reaction could be performed on the gram-scale,and the resulting chiral amino alcohols are key intermediates of norephedrine and metaraminol.展开更多
Plastic waste recycling is a focal point in today's sustainable development efforts.Improper disposal can lead to secondary pollution,posing threats to the environment and human health.In this study,we aim to recy...Plastic waste recycling is a focal point in today's sustainable development efforts.Improper disposal can lead to secondary pollution,posing threats to the environment and human health.In this study,we aim to recycle waste epoxy resin and glass fiber-reinforced epoxy resin composites via an electroless plating and a carbonization process,to design high-value-added carbon materials for microwave absorption.By pulverizing solid waste and introducing magnetic metal nanoparticles onto its surface,a composite carbon material capable of excellent microwave absorption performance was successfully developed.Specifically,doping nickel particles into carbon materials derived from glass fiber/epoxy resin achieved a wide effective absorption bandwidth(EAB)of 5.9 GHz with a matching thickness of 1.9 mm,covering nearly the entire Ku band,and achieving a minimum reflection loss(RLmin)of−36 dB simultaneously.The superior absorption performance is attributed to multiple reflections or scattering of electromagnetic waves within the material,as well as conduction and magnetic losses,dipole and interfacial polarization effects.These results demonstrate that through rational design and optimization,waste epoxy and waste glass fiber-reinforced epoxy resin-based composite materials can be effectively recycled into high-performance microwave absorbing materials,offering a straightforward and efficient pathway for waste resource utilization.展开更多
基金Natural Science Foundation of China,Grant/Award Number:22108042Guangzhou(202201020147)。
文摘BiVO_(4)is one of the most promising photoanode materials for photoelectrochemical(PEC)solar energy conversion,but it still suffers from poor photocurrent density due to insufficient light‐harvesting efficiency(LHE),weak photogenerated charge separation efficiency(Φ_(Sep)),and low water oxidation efficiency(Φ_(OX)).Herein,we tackle these challenges of the BiVO_(4)photoanodes using systematic engineering,including catalysis engineering,bandgap engineering,and morphology engineering.In particular,we deposit a NiCoO_(x)layer onto the BiVO_(4)photoanode as the oxygen evolution catalyst to enhance theΦ_(OX)of Fe‐g‐C_(3)N_(4)/BiVO_(4)for PEC water oxidation,and incorporate Fe‐doped graphite‐phase C_(3)N_(4)(Fe‐g‐C_(3)N_(4))into the BiVO_(4)photoanode to optimize the bandgap and surface areas to subsequently expand the light absorption range of the photoanode from 530 to 690 nm,increase the LHE andΦ_(Sep),and further improve the oxygen evolution reaction activity of the NiCoO_(x)catalytic layer.Consequently,the maximum photocurrent density of the as‐prepared NiCoO_(x)/Fe‐g‐C_(3)N_(4)/BiVO_(4)is remarkably boosted from 4.6 to 7.4 mA cm^(−2).This work suggests that the proposed systematic engineering strategy is exceptionally promising for improving LHE,Φ_(Sep),andΦ_(OX)of BiVO_(4)‐based photoanodes,which will substantially benefit the design,preparation,and large‐scale application of next‐generation high‐performance photoanodes.
基金supported by the National Natural Science Foundation of China (No. 21878226, No. U20A20153)the Chemistry and Chemical Engineering Guangdong Laboratory (Grant No. 1912011)。
文摘As one of the most common cathode materials for aqueous zinc-ion batteries(AZIBs),manganese oxides have the advantages of abundant reserves,low cost,and low toxicity.However,the electrochemical mechanism at the cathode of aqueous zinc-manganese batteries(AZMBs) is complicated due to different electrode materials,electrolytes and working conditions.These complicated mechanisms severely limit the research progress of AZMBs system and the design of cells with better performance.Hence,the mechanism of AZMBs currently recognized by most researchers according to the classification of the main ions involved in the faradaic reaction is introduced in the review.Then a series of reasons that affect the electrochemical behavior of the battery are summarized.Finally,the failure mechanisms of AZMBs over prolonged cycling are discussed,and the current insufficient research areas of the system are explained,along with the direction of further research being prospected.
基金Supported by the National Key R&D Program of China(2018YFB0605700).
文摘TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and therefore reduce the lightening power of TiO2. In the present work, a uniform, amorphous, 2.9-nm-thick TiO2 protective layer was deposited onto the surface of anatase TiO2 pigments according to pulsed chemical vapor deposition at room temperature, with Ti Cl4 as titanium precursor. Amorphous TiO2 coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO2 coating with amorphous SiO2 and SnO2 layers. However, the lightening power of amorphous TiO2 layer is higher than those of amorphous SiO2 and SnO2 layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity.
基金supported by the State Key Laboratory of Catalytic Materials and Reaction Engineering(RIPP,SINOPEC)the National Natural Science Foundation of China(Nos.21878216,22005215)+1 种基金Hebei Province Innovation Ability Promotion Project(No.20312201D)the National Key Research and Development Program of China(No.2019YFE0118800)。
文摘The lithiated covalent organic framework(named TpPa-SO_(3) Li),which was prepared by a mild chemical lithiation strategy,was introduced in poly(ethylene oxide)(PEO)to produce the composite polymer electrolytes(CPEs).Li-ion can transfer along the PEO chain or across the layer of TpPa-SO_(3) Li within the nanochannels,resulting in a high Li-ion conductivity of3.01×10^(-4)S/cm at 60℃.When the CPE with 0.75 wt.%TpPa-SO_(3) Li was used in the LiFePO_(4)‖Li solid-state battery,the cell delivered a stable capacity of 125 mA·h/g after 250 cycles at 0.5 C,60℃.In comparison,the cell using the CPE without TpPa-SO_(3) Li exhibited a capacity of only 118 mA·h/g.
基金supported financially by the National Natural Science Foundation of China(Grant Nos.91961125 and 21905019)“Key Program for International S&T Cooperation Projects of China”from the Ministry of Science and Technology of China(Grant No.2018YFE0124600)+2 种基金“the Fundamental Research Funds for the Central Universities”(Grant No.2018JBZ107)the Chemistry and Chemical Engineering Guangdong Laboratory(Grant No.1932004)support from the“Excellent One Hundred”project of Beijing Jiaotong University。
文摘Up to now,three kinds of ion-storage mechanisms are summarized towards anode materials in lithium/sodium-ion batteries,but they have low capacity and poor cyclic performance.Therefore,it is necessary to develop a new approach to optimize ion storage.Herein,we report an adsorption/desorption storage route through engineering electronic structure of cation-deficient Ti_(1-x)O_(2)nanosheets.Ti_(1-x)O_(2)nanosheets indeed exhibit higher capacity(332.1 mA h g^(-1)vs.137.7 mA h g^(-1)for LIBs,195.7 mA h g^(-1)vs.111 mA h g^(-1)for SIBs),and more stable cyclic performance(296 mA h g^(-1)vs.99 mA h g^(-1)for LIBs,178.1 mA h g^(-1)vs.80.2 mA h g^(-1)for SIBs after 100 cycles)at 0.1 A g^(-1)than TiO_(2)nanosheets.Kinetics analysis and density functional theory(DFT)calculations reveal that electronic structures of vacancy within Ti_(1-x)O_(2) nanosheets encourage a novel adsorption-desorption storage route.These results highlight the benefits of the engineered electronic structures within electrode material and implement novel ion-storage mechanism towards broad energy storage applications.
基金financially supported by the Guangdong Basic and Applied Basic Research Foundation(No.2022A1515110212)the Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province(Nos.STKJ202209077,STKJ202209083,and STKJ202209021)+1 种基金Scientific Research Foundation of Shantou University(No.NTF21022)City University of Hong Kong Strategic Research Grant(SRG)(No.7005505)。
文摘Bi VO_(4)is a promising semiconducting photoanode for photoelectrochemical(PEC)water splitting due to its suitable bandgap.However,the dissolution of V^(5+)and sluggish reaction kinetics at the surface in the oxygen evolution reaction(OER)limit its applications.Herein,we report a convenient strategy to change the microenvironment by adding Fe(Ⅲ)into the electrolyte.During the PEC process,Fe(Ⅲ)ions not only improve the current density,but also show excellent stability toward Bi VO_(4).Consequently,the current increases by more than 1.7 times compared to that without Fe(Ⅲ).Photoelectrochemical,morphological,and structural characterizations reveal that the FeOOH co-catalyst produced in situ on the Bi VO_(4)photoanode by cyclical formation of the intermediates at the electrode/electrolyte interface during OER accelerates the OER kinetics and prevents photo-corrosion by suppressing the dissolution of V^(5+).The results reveal a new strategy for the multifunctional modification of photoanodes for efficient solar conversion.
基金the financial support from the National Natural Science Foundation of China(22108044,22208061)the Research and Development Program in Key Fields of Guangdong Province(2020B1111380002)+1 种基金the Basic Research and Applicable Basic Research in Guangzhou City(202201010290)the financial support from the Guangdong Provincial Key Laboratory of Plant Resources Biorefinery(2021GDKLPRB07)。
文摘Amorphous carbons are promising anodes for high-rate potassium-ion batteries.Most low-temperature annealed amorphous carbons display unsatisfactory capacities.Heteroatom-induced defect engineering of amorphous carbons could enhance their reversible capacities.Nevertheless,most lignocellulose biomasses lack heteroatoms,making it a challenge to design highly heteroatom-doped carbons(>10 at%).Herein,we report a new preparation strategy for amorphous carbon anodes.Nitrogen/sulfur co-doped lignin-derived porous carbons(NSLPC)with ultra-high nitrogen doping levels(21.6 at%of N and 0.8 at%of S)from renewable lignin biomacromolecule precursors were prepared through a supramolecule-mediated pyrolysis strategy.This supermolecule/lignin composite decomposes forming a covalently bonded graphitic carbon/amorphous carbon intermediate product,which induces the formation of high heteroatom doping in the obtained NSLPC.This unique pyrolysis chemistry and high heteroatom doping of NSLPC enable abundant defective active sites for the adsorption of K+and improved kinetics.The NSLPC anode delivered a high reversible capacity of 419 mAh g^(-1)and superior cycling stability(capacity retention of 96.6%at 1 A g^(-1)for 1000 cycles).Potassiumion hybrid capacitors assembled by NSLPC anode exhibited excellent cycling stability(91%capacity retention for 2000 cycles)and a high energy density of 71 Wh kg^(-1)at a power density of 92 W kg^(-1).
基金Nanjing Forestry University[Grant Nos.163020139,164020818,163020217 and 16302023]National Natural Science Foundation of China(5201101466).
文摘A novel coronavirus of zoonotic origin(SARSCoV-2)has recently been recognized in patients with acute respiratory disease.COVID-19 causative agent is structurally and genetically similar to SARS and bat SARS-like coronaviruses.The drastic increase in the number of coronavirus and its genome sequence have given us an unprecedented opportunity to perform bioinformatics and genomics analysis on this class of viruses.Clinical tests like PCR and ELISA for rapid detection of this virus are urgently needed for early identification of infected patients.However,these techniques are expensive and not readily available for point-of-care(POC)applications.Currently,lack of any rapid,available,and reliable POC detection method gives rise to the progression of COVID-19 as a horrible global problem.To solve the negative features of clinical investigation,we provide a brief introduction of the general features of coronaviruses and describe various amplification assays,sensing,biosensing,immunosensing,and aptasensing for the determination of various groups of coronaviruses applied as a template for the detection of SARS-CoV-2.All sensing and biosensing techniques developed for the determination of various classes of coronaviruses are useful to recognize the newly immerged coronavirus,i.e.,SARS-CoV-2.Also,the introduction of sensing and biosensing methods sheds light on the way of designing a proper screening system to detect the virus at the early stage of infection to tranquilize the speed and vastity of spreading.Among other approaches investigated among molecular approaches and PCR or recognition of viral diseases,LAMP-based methods and LFAs are of great importance for their numerous benefits,which can be helpful to design a universal platform for detection of future emerging pathogenic viruses.
基金support from the National Natural Science Foundation of China(Grant No.22108044)the Re-search and Development Program in Key Fields of Guangdong Province(2020B1111380002)+1 种基金the Basic Research and Applicable Basic Research in Guangzhou City(202201010290)the financial support from the Guangdong Provincial Key Laboratory of Plant Resources Biorefinery(2021GDKLPRB07,2021GDKLPRB-K06).
文摘Hard carbon is considered as the most commercially applicable anode for sodium-ion batteries.Lignin has the characteristics of sustainable,low cost,high carbon content(>60%)and abundant oxygen functional groups,which is expected to be used as a promising candidate precursor for low-cost hard carbons.The structure and electrochemical performances of hard carbons could be regulated by adjusting carbonization temperature.The microstructure and electrochemical performance of LDHC anode are highly dependent on the carbonization tem-perature.Increasing carbonization temperature could reduce specific surface area and improve initial coulombic efficiency.The slope and plateau capacity of the LDHC anode could also be adjusted by changing the carboniza-tion temperature.The LDHC prepared at 1200℃showed the best sodium-ion storage performance,with an initial coulombic efficiency of 78.9%and a reversible sodium-ion storage capacity of 284.7 mAh g^(−1).
基金supported by National Key Research&Development Program of China (2022YFA1506200)the National Natural Science Foundations of China (22078007, 21627813, 21706009,22002085)+3 种基金Guangdong Basic and Applied Basic Research Foundation (2020A1515110832)the Fundamental Research Funds for the Central Universities (buctrc201921, JD2223)Innovative Achievement Commercialization Service-Platform of Industrial CatalysisChemistry and Chemical Engineering Guangdong Laboratory for a startup funding support(2111001)
文摘Bimetallic nanoparticles exhibit a synergistic effect that critically depends on their surface composition,but such promotion mechanisms become vague with varying surface compositions.Here,alumina supported Ag@Pd core–shell and PdAg alloy structure with controlled size and surface compositions were prepared to demonstrate synergetic mechanisms,particularly,ligand and strain effects on activity and ethylene selectivity for acetylene hydrogenation.The performance evaluation indicates that Ag@Pd catalysts with well-controlled Pd-shell thickness can effectively lower apparent activation energy and improve ethylene selectivity.Hydrogenation activity increases from 0.019 to 0.062 s^(-1) with decreasing Pd-shell thickness under mild conditions,which is 3–6 times higher than their alloyed and monometallic counterparts.Combined characterizations and density functional theory are conducted to reveal such shell-thickness-dependent performance.The ligand effect arising from Ag alloying in the interface of Ag@Pd2ML observes the strongest binding of acetylene,but it diminished sharply and the strain effect gets more prevailing with increasing shell thickness.The competition of ethylene desorption and deephydrogenation were also investigated to understand the selectivity governing factors,and the selectivity descriptor(0.5BE(C_(2)H_(4))–BE(H))was built to match the contribution of ligand and strain effect on the different surfaces of Pd-Ag bimetallic NPs.The exploration of synergetic mechanisms among bimetallic NPs with varied structure and surface compositions in this work can help us to deepen the understanding catalyst structure–activity relationship and provide a feasible way to optimize the overall catalytic performance.
基金supported by National Natural Science Foundation of China(Nos.52472194,52101243)Natural Science Foundation of Guangdong Province,China(No.2023A1515012619)the Science and Technology Planning Project of Guangzhou(No.202201010565)。
文摘In recent years,metal phosphosulfides have attracted great attention as the promising anode materials in sodium/potassium batteries because of their incorporation of the advantages of metal phosphides and sulfides.However,they are also confronted with the problem of unstable battery performance due to the heavy volume expansion and sluggish ion reaction kinetics.Herein,yolk-shell cobalt phosphosulfide nanocrystals encapsulating into multi-heterogeneous atom(N,P,S)-doped carbon framework(Co_(9)S_(8)/CoP@NPSC)were constructed by employing dodecahedral ZIF-67 as precursor and a polymer as carbon sources through simultaneous sulfidation and phosphorization processes.The synergistic effect of Co_(9)S_(8)and CoP component and the yolk-shell structure greatly improve the bettery performance and structural stability.In addition,the multiple hetero-atoms doped carbon frameworks enhance the conductivity of the electrode materials and increase the spacing of carbon layers to supply sufficient active sites and facilitate the Na^(+)/K^(+)transport.The electrochemical results demonstrated that Co_(9)S_(8)/CoP@NPSC exhibited the pleasant reversible capacity(360.47 mAh/g at 1 A/g)after 300 cycles and an unpredictable cycling stability(103.22 mAh/g after 1000 cycles)in the SIBs application.The ex-situ XRD and XPS analyses were further applied to study the sodium ion storage mechanism and the multi-step phase transition reaction of the yolk-shell heterogeneous structure.This work provides new perspectives for the preparation of novel structure metal phosphosulfide and their applications in anode materials for sodium/potassium batteries and other secondary batteries.
基金supported by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2021B0301030001)the National Key Research and Development Program of China(Grant No.2021YFB3802300)the Foundation of National Key Laboratory of Shock Wave and Detonation Physics(Grant No.JCKYS2022212004)。
文摘The graded density impactor(GDI)dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons.The accuracy and timeliness of GDI structural design are key to achieving controllable stress-strain rate loading.In this study,we have,for the first time,combined one-dimensional fluid computational software with machine learning methods.We first elucidated the mechanisms by which GDI structures control stress and strain rates.Subsequently,we constructed a machine learning model to create a structure-property response surface.The results show that altering the loading velocity and interlayer thickness has a pronounced regulatory effect on stress and strain rates.In contrast,the impedance distribution index and target thickness have less significant effects on stress regulation,although there is a matching relationship between target thickness and interlayer thickness.Compared with traditional design methods,the machine learning approach offers a10^(4)—10^(5)times increase in efficiency and the potential to achieve a global optimum,holding promise for guiding the design of GDI.
文摘Sodium-ion batteries(SIBs)have emerged as a promising alternative to commercial lithium-ion batteries be-cause of the similar properties of Li and Na as well as the abundance and accessibility of sodium resources.The devel-opment of anode materials with a high capacity,excellent rate performance,and long cycle life is the key to the indus-trialization of SIBs.Biomass-derived carbon(BDC)anode materials synthesized from resource-rich,low-cost,and re-newable biomass have been extensively researched and their excellent sodium storage performance has been proven,making them the most promising new low-cost and high-performance anode material for SIBs.This review first intro-duces the sources of BDCs,including waste biomass such as plants,animals,and microorganisms,and then describes sev-eral methods for preparing BDC anode materials,including carbonization,chemical activation,and template methods.The storage mechanism and kinetic process of Na^(+)in BDCs are then considered as well as their structure control.The electrochemical properties of sodium-ion storage in BDCs with different structures are examined,and suggestions for future re-search are made.
基金supported by the National Natural Science Foundation of China(52472194,52101243)the Natural Science Foundation of Guangdong Province,China(2023A1515012619,2025A1515012571,2025A1515010345)the Science and Technology Planning Project of Guangzhou(202201010565).
文摘Sodium-ion batteries are receiving more and more attention due to their low cost and abundant sodium storage capacity,and are considered to be a promising alternative to lithium-ion batteries.A large number of studies have shown that constructing heterostructures are considered an effective strategy to solve the hysteresis problem of electronic and ion dynamics in sodiumion battery anode materials.Herein,a nickel-cobalt bimetallic coordination polymer(NiCoCP)was synthesized using a coprecipitation method,and a CoSe_(2)@NiSe_(2) cross-stacked structure was obtained through high-temperature carbonization and selenization processes.CoSe_(2)@NiSe_(2) has a unique heterostructure and carbon film,which synergistically increases a large number of adsorption sites and alleviates the diffusion energy barrier,thereby improving the rapid diffusion kinetics of Na^(+)ions.It has superior rate performance and long-lasting cycle life.For sodium-ion batteries(SIBs),the specific capacity of CoSe_(2)@NiSe_(2) is around 460 mA h g^(-1) after 400 cycles at 1.0 A g^(-1).For potassium-ion batteries(PIBs),CoSe_(2)@NiSe_(2) also exhibits excellent cycling stability,maintaining a specific capacity of 160 mA h g^(-1) after 700 cycles at 1.0 A g^(-1).This study provides a new way to prepare metal selenide heterostructure as the promising anode material for SIBs.
文摘Magnesium-based hydrogen storage materials are gaining significant attention due to their high hydrogen storage capacity and abundant availability.However,they encounter challenges,including slow hydrogen absorption and desorption kinetics and elevated operating temperatures.To address these issues,researchers have employed two main strategies:nanostructuring and the introduction of catalysts.This review provides a comprehensive overview of recent advancements in the modification of MgH_(2),emphasizing the impact of nanostructuring on enhancing hydrogen storage performance.It also examines the role of various catalysts,including carbon-based materials,transition metals and alloys,their oxides and halides,and composites,in improving hydrogen absorption and desorption characteristics.Studies indicate that these modifications can substantially lower the hydrogen absorption and desorption temperatures while enhancing kinetic performance.Furthermore,the effectiveness of catalysts is influenced by their type,dispersion,and interaction with magnesium-based materials and the catalytic mechanism,thereby elucidating the underlying catalytic mechanisms.The review concludes by discussing the current challenges and future directions in this field,aiming to provide theoretical insights for the practical application of magnesium-based hydrogen storage materials.
基金supported financially by the National Natural Science Foundation of China(22178229)the Natural Science Foundation of Sichuan Province(2022NSFSC1190)。
文摘With the development of vanadium redox flow battery technology,the demand for pure vanadium is rapidly increasing.The separation of vanadium from vanadium-chromium leaching solutions are critical step in the production of purity-vanadium.This study presents an innovative adsorption process that utilizes amorphous ZrO_(2)(AZrO) for the selective separation of V(Ⅴ) and Cr(Ⅵ).In this process,a high adsorption capacity for V(V) at 64.5 mg·g^(-1) was achieved,while the capacity for Cr(Ⅵ) is relatively low at 24.1 mg·g^(-1),demonstrating good separation performance.This is mainly caused by the large specific surface area and mesoporous structure,which are favorable for molecular diffusion and mass transfer.The kinetic analysis shows that the adsorption process follows pseudo-second-order kinetic process with chemisorption being the rate-controlling process.AZrO showed excellent separation performance in mixed solutions over a wide range of concentrations.After five cycles,AZrO retained over 73% of its capacity,indicating good stability.In mixed solutions containing up to 40 g·L^(-1) of V(Ⅴ) and 3 g·L^(-1) of Cr(Ⅵ),the innovative adsorption process successfully achieved effective separation and purification.By an adsorption-desorption process using 0.1 mol·L^(-1) NaOH,a 99.02% V(Ⅴ)-rich solution was obtained from a high concentration sodium vanadium slag leaching solution,demonstrating its effectiveness for practical industrial applications.
基金supported by the Key-Area Research and Development Program of Guangdong Province(2021B0707060001)the National Natural Science Foundation of China(32001696)Guangxi Science and Technology Base and Talent Special Project(2021AC19445).
文摘The Bama diet(BD),Mediterranean diet(MD),and Japanese diet(JD)are three typical dietary patterns from distinct geographical regions.The aim of this study was to compare the efficacy of three diets in preventing colitis through gut microbe-metabolite-mediated regulatory mechanisms.This was achieved by integrating gut microbiome and metabolomics analyses.Results showed that BD could significantly increase the level of interleukin 10(IL-10),which has the potential to modulate the intestinal immune response.This was achieved by modulating the a-linoleic acid metabolism and promoting Akkermansia proliferation.MD elevated IL-10 level and increased the expression of tight junction proteins such as occludin,claudin-1,and zonula occludens-1.This effect might be attributed to the increased abundance of bifidobacteria,which impacted the primary bile acid biosynthesis pathway.JD decreased tumor necrosis factorαlevel and increased IL-10 level.This could be due to JD promoting the enrichment of Faecalibacterium,which affected the metabolism of arachidonic acid.Furthermore,the anti-inflammatory effects of the different metabolites,namely a-linoleic acid,cholic acid,and arachidonic acid,were confirmed using the RAW264.7 cellular inflammation model.
基金financially supported by the Science and Technology Program of Guangzhou (202201010373)。
文摘Oxygen vacancy engineering is a valid strategy to boost the oxygen reduction reaction(ORR) performance of nanostructured electrocatalysts.Current methods for generating surface oxygen vacancies(Vos) in nanostructured MnO_(2) is mostly lab-scale,which cannot meet the requirement of large-scale production.Herein,we employed a mechanochemical method of ball milling to introduce surface Vos into the β-MnO_(2) nanoparticles.The ball milling process generated abundant surface Vos,which significantly facilitated the adsorption and activation of O_(2).Consequently,the ORR performance of ball-milled β-MnO_(2) was markedly boosted by varying the ball milling time.As an air cathode catalyst for zinc-air battery(ZAB),the β-MnO_(2) ball-milled for 4 h displayed a high specific capacity of 804 mA·h·g^(-1) and excellent cycling over 500 h at 5 mA·cm^(-2),which were superior than those of pristine β-MnO_(2)-based ZAB.Our work offers a feasible strategy to enhance electrocatalytic ORR performance of MnO_(2),which shows significant potential for large-scale production of efficient ORR electrocatalysts.
基金the National Key R&D Program of China(No.2021YFA1500201)Shenzhen Science and Technology Innovation Committee(No.KQTD20150717103157174)+6 种基金Stable Support Plan Program of Shenzhen Natural Science Fund(No.20200925161222002)Key-Area Research and Development Program of Guangdong Province(No.2020B010188001)Innovative Team of Universities in Guangdong Province(No.2020KCXTD016)National Natural Science Foundation of China(No.21991113)the National Natural Science Foundation of China(Nos.21901107 and 22171129)the Guangdong Basic and Applied Basic Research Foundation(2022B1515020055)Shenzhen Science and Technology Innovation Committee(No.JCYJ20210324104202007)for financial support。
文摘The dynamic kinetic resolution(DKR)process remains a highly efficacious approach for constructing chiral amino alcohols via the catalytic asymmetric hydrogenation ofα-amino ketones.We report herein a highly efficient and enantioselective anti-selective dynamic kinetic asymmetric hydrogenation ofα-amino ketones catalyzed by Ir-(S)-f-phamidol system,providing various chiral amino alcohols and chiral oxazolidin-2-ones divergently with high diastereo-and enantioselectivity(up to 99%yield,up to 99%ee and up to 99:1 dr).In addition,the reaction could be performed on the gram-scale,and the resulting chiral amino alcohols are key intermediates of norephedrine and metaraminol.
基金supported by the National Natural Science Foundation of China(No.52173264)the Natural Science Foundation Project of Chongqing(No.cstc2024ycjh-bgzxm0005)+1 种基金the Fundamental Research Funds for the Central Universities(No.SWU-XDJH202314)The authors thanks Dr.Xi Tang in Southwest University for the technical support in the use of the vector network analyzer.
文摘Plastic waste recycling is a focal point in today's sustainable development efforts.Improper disposal can lead to secondary pollution,posing threats to the environment and human health.In this study,we aim to recycle waste epoxy resin and glass fiber-reinforced epoxy resin composites via an electroless plating and a carbonization process,to design high-value-added carbon materials for microwave absorption.By pulverizing solid waste and introducing magnetic metal nanoparticles onto its surface,a composite carbon material capable of excellent microwave absorption performance was successfully developed.Specifically,doping nickel particles into carbon materials derived from glass fiber/epoxy resin achieved a wide effective absorption bandwidth(EAB)of 5.9 GHz with a matching thickness of 1.9 mm,covering nearly the entire Ku band,and achieving a minimum reflection loss(RLmin)of−36 dB simultaneously.The superior absorption performance is attributed to multiple reflections or scattering of electromagnetic waves within the material,as well as conduction and magnetic losses,dipole and interfacial polarization effects.These results demonstrate that through rational design and optimization,waste epoxy and waste glass fiber-reinforced epoxy resin-based composite materials can be effectively recycled into high-performance microwave absorbing materials,offering a straightforward and efficient pathway for waste resource utilization.
