The utilization of seawater,a plentiful and cost-effective resource,instead of freshwater for H_(2)production through electrolysis has garnered significant attention.Herein,we present the synthesis of open-structured ...The utilization of seawater,a plentiful and cost-effective resource,instead of freshwater for H_(2)production through electrolysis has garnered significant attention.Herein,we present the synthesis of open-structured Fe-Co phosphide(FCP)nanocages for the overall seawater electrolysis,employing metallurgical solid waste(steel rolling sludge,SRS)as the precursor material.The FCP nanocages demonstrate exceptional catalytic activity for the hydrogen evolution reaction(HER)in all pH scales,achieving performance comparable to that of Pt/C catalysts at high current densities,The electrolyzer assembled with FCP‖FCP requires 1.57 and 1.68 V to achieve current densities of 10 and 100 mA cm^(-2),respectively.Furthermore,the assembled FCP electrolyzer showcases over 100 h of cycling stability and nearly 100%Faradaic efficiency.Crucially,it can be powered by commercially available silicon solar panels,operating under an intensity of 100 mW cm^(-2),and by wind-driven sources,rendering it highly promising for real-world applications,The seawater hydrogen evolution system coupled with levofloxacin(LEV)degradation was constructed for the first time.The oxidation potential of LEV oxidation reaction(LEVOR)was significantly lower than that of oxygen evolution reaction(OER),indicating that the LEV degradation reaction occurred preferentially and achieved a removal efficiency of 98.57%within 60 min.This study provides effective strategies for valorizing SRS and offers insights into the fabrication of highperformance catalysts.展开更多
For the effective treatment of the wastewater with low-medium concentration ammonia nitrogen and low strength COD,a high-performance Co_(3)O_(4) catalyst supported on carbon nanocages(CNCs)was prepared.By isovolumetri...For the effective treatment of the wastewater with low-medium concentration ammonia nitrogen and low strength COD,a high-performance Co_(3)O_(4) catalyst supported on carbon nanocages(CNCs)was prepared.By isovolumetric im pregnation,Co_(3)O_(4) could be uniformly dispersed on surface of CNCs,which possess tiny particle size and strong electron transfer capability.The catalytic performance of the prepared Co_(3)O_(4)/CNCs catalysts with different Co_(3)O_(4) loadings was systematically evaluated and compared with Co_(3)O_(4)/CNTs.It is found that 20 wt.%Co_(3)O_(4)/CNCs shows the best catalytic performance,achieving an ammonia nitrogen conversion rate of 71.0%and a nitrogen selectivity of 81.8%.Compared to commonly used Co_(3)O_(4),ammonia conversion and nitrogen selectivity of Co_(3)O_(4)/CNCs increased by 28.9%and 15.8%respectively.In the five consecutive cycles,the catalytic activity remained stable.The mechanism that CNCs support effectively increases the surface oxygen vacancies of Co_(3)O_(4) through XPS analysis was also elucidated,and DFT calculations confirm strong electron transfer between CNCs and Co_(3)O_(4),rendering Co_(3)O_(4) nanoparticles as the primary catalytic active sites.The results may contribute to the development of highperformance catalytic ozone oxidation catalysts for ammonia nitrogen.展开更多
Shape control of nickel sulfide(NiS_(2))catalysts is beneficial for boosting their catalytic performances,which is vital to their practical application as a class of advanced non-noble electro-catalysts.However,precis...Shape control of nickel sulfide(NiS_(2))catalysts is beneficial for boosting their catalytic performances,which is vital to their practical application as a class of advanced non-noble electro-catalysts.However,precisely controlling the formation kinetics and fabricate ultrathin NiS_(2)nanostructures still remains challenge.Herein,we provide an injection rate-mediated method to fabricate ultrathin NiS_(2)nanocages(HNCs)with hierarchical walls,high-density lattice defects and abundant grain boundaries(GBs).Through mechanism analysis,we find the injection rate determines the concentration of S_(2)−in the steady state and thus control the growth pattern,leading to the formation of NiS_(2)HNCs at slow etching kinetics and NiCo PBA@NiS_(2)frames at fast etching kinetics,respectively.Benefiting from the ultrathin and hierarchical walls that minimize the mass transport restrictions,the high-density lattice defects and GBs that offer abundant unsaturated reaction sites,the NiS_(2)HNCs exhibit obviously enhanced electrocatalytic activity and stability toward OER,with overpotential of 255mV to reach 10mA/cm^(2)and a Tafel slope of 27.44mV/dec,surpassing the performances of NiCo PBA@NiS_(2)frames and commercial RuO_(2).展开更多
Rational design of complex hollow nanostructures offers a great opportunity to construct various functional nanostructures.A novel in situ disassembly-polymerization-pyrolysis approach was developed to synthesize atom...Rational design of complex hollow nanostructures offers a great opportunity to construct various functional nanostructures.A novel in situ disassembly-polymerization-pyrolysis approach was developed to synthesize atomically dispersed Fe single atoms(Fe SAs)and tiny Co nanoparticles(Co NPs)binary sites embedded in double-shelled hollow carbon nanocages(Co NPs/Fe SAs DSCNs)without removing excess templates.The Co NPs/Fe SAs DSCNs displayed excellent bifunctional activity,boosting the realistic rechargeable zinc-air batteries with high efficiency,long-term durability,and reversibility,which is comparable to noble metal catalysts(Pt/C and RuO_(2)).The enhanced catalytic activity should be attributed to as well as the strong interactions between Fe SAs and Co NPs with the nitrogen-doped carbon matrix,the exposure of more active sites,and the high-flux mass transportation.In addition,the confinement effect between the double C–N shells prevented the aggregation and corrosion of metal atoms,thus improving the durability of the Co NPs/Fe SAs DSCNs,further highlighting the structural advantages of carbon nanoreactor.This work provides guidance for further rational design and preparation of complex hollow structure materials with advanced bifunctional air cathodes.展开更多
CoFe-Prussian blue analog(CoFe-PBA)template derived porous nanocages comprising hollow(Co,Fe)O nanoparticles are introduced as a highly efficient anode for lithium-ion batteries(LIBs)by integrat-ing the co-precipitati...CoFe-Prussian blue analog(CoFe-PBA)template derived porous nanocages comprising hollow(Co,Fe)O nanoparticles are introduced as a highly efficient anode for lithium-ion batteries(LIBs)by integrat-ing the co-precipitation and nanoscale Kirkendall diffusion processes.This strategic approach employs a solution-based facile polydopamine(PDA)-derived carbon coating process to control the oxidation rate of nanoparticles during subsequent heat treatment to achieve the hollow structure by the nanoscale Kirk-endall diffusion effect.The application of different concentrations of PDA to the nanocages resulted in the formation of porous nanocages of three types,such as(Co,Fe)O@PDA-C-20,(Co,Fe)O@PDA-C-100,and(Co,Fe)O@PDA-C-200.Notably,(Co,Fe)O@PDA-C-100 porous nanocages exhibit remarkable cycling stability by the hollow structured(Co,Fe)O nanoparticles.Additionally,the hollow and porous structures facilitate rapid charge species diffusion,efficient electrolyte infiltration,and effective management of volumetric changes.When used as anodes for LIBs,the hollow(Co,Fe)O@PDA-C-100 anodes demonstrate impressive structural robustness and high-rate performance.They exhibit remarkable structural integrity,demon-strating stable cycling performance for up to 300 cycles at 0.5 and 1.0 A g^(-1)(capacity retentions of 99.3%and 97.2%,respectively).In terms of rate capability,the hollow(Co,Fe)O@PDA-C-100 porous nanocages exhibit a high discharge capacity of 284 mA h g^(-1) at 10 A g^(-1).Moreover,the practical application po-tential of the prepared hollow(Co,Fe)O@PDA-C-100 anode is demonstrated by a full-cell test paired with and Li(Ni0.8Co0.1Mn0.1)O2 cathode under the condition of practical application.This clearly highlights the structural advantages of the prepared hollow(Co,Fe)O@PDA-C-100 porous nanocages.展开更多
Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is critical for rechargeable metal-air batteries. Herein, we report a new 3D hier...Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is critical for rechargeable metal-air batteries. Herein, we report a new 3D hierarchical sulfur and nitrogen co-doped carbon nanocages(hSNCNC) as a promising bifunctional oxygen electrocatalyst by an in-situ MgO template method with pyridine and thiophene as the mixed precursor. The as-prepared h SNCNC exhibits a positive half-wave potential of 0.792 V(vs. reversible hydrogen electrode, RHE) for ORR, and a low operating potential of 1.640 V at a 10 mA cm-2 current density for OER. The reversible oxygen electrode index is 0.847 V, far superior to commercial Pt/C and IrO2,which reaches the top level of the reported bifunctional catalysts. Consequently, the hSNCNC as air cathodes in an assembled Zn-air battery features low charge/discharge overpotential and long lifetime. The remarkable properties arises from the introduced multiple heteroatom dopants and stable 3D hierarchical structure with multi-scale pores, which provides the abundant uniform high-active S and N species and efficient charge transfer as well as mass transportation. These results demonstrate the potential strategy in developing suitable carbon-based bi-/multi-functional catalysts to enable the next generation of the rechargeable metal-air batteries.展开更多
The design of electrode materials with specific structures is considered a promising approach for improving the performance of lithium-ion batteries(LIBs).In this paper,FeO/CoO hollow nanocages coated with a N-doped c...The design of electrode materials with specific structures is considered a promising approach for improving the performance of lithium-ion batteries(LIBs).In this paper,FeO/CoO hollow nanocages coated with a N-doped carbon layer(FCO@NC)was prepared using Fe-Co-based Prussian blue analogs(PBA)as a precursor.During the synthesis,dopamine was the carbon and nitrogen source.The reducing atmosphere was assured via NH_3/Ar,which regulated the vacancies in the structure of FCO@NC as well as increased its conductivity.When used as anode materials for LIBs,the FCO@NC nanocages deliver a high reversible capacity of 774.89 mAh·g^(-1)at 0.3 A·g^(-1)after200 cycles with a capacity retention rate of 80.4%and426.76 mAh·g^(-1)after 500 cycles at a high current density of 1 A·g^(-1).It is demonstrated that the hollow nanocage structure can effectively enhance the cycle stability,and the heat treatment in NH_(3)/Ar atmosphere contributes to the oxygen vacancy content of the electrode materials,further facilitating its conductivity and electrochemical performance.展开更多
It is challenging to prepare a binary assembled metal-organic framework(MOF) by anisotropic epitaxial growth method. Besides, nanocages(NCs) with hollow structures are often constructed to improve microwave absorbing ...It is challenging to prepare a binary assembled metal-organic framework(MOF) by anisotropic epitaxial growth method. Besides, nanocages(NCs) with hollow structures are often constructed to improve microwave absorbing abilities. Herein, we combine the selective epitaxial growth and hollow engineering technologies to fabricate hybrid MOF-derived NCs. Benefiting from the unique nanocage/porous structure,complementary magnetic/dielectric components and suitable impedance matching characteristics, the optimized absorber(CoNi/TiO@PC-NCs) exhibits unique microwave absorbing properties. It is worth noting that the minimum reflection loss(RLmin) of the absorber reaches-65.3 dB, and the overall effective absorption bandwidth(EAB, RL <-10 dB) covers 15.1 GHz(2.9–18 GHz). The maximum EAB under a single thickness covers 4.4 GHz, displaying skipping dual-band coverages at both high and low frequencies. This work might provide a novel perspective for the synthesis of assembled MOF-derived absorbers.展开更多
Lithium-ion capacitors(LICs) combining the advantages of lithium-ion batteries and supercapacitors are considered a promising nextgeneration energy storage device. However, the sluggish kinetics of battery-type anode ...Lithium-ion capacitors(LICs) combining the advantages of lithium-ion batteries and supercapacitors are considered a promising nextgeneration energy storage device. However, the sluggish kinetics of battery-type anode cannot match the capacitor-type cathode, restricting the development of LICs. Herein, hierarchical carbon framework(HCF) anode material composed of 0D carbon nanocage bridged with 2D graphene network are developed via a template-confined synthesis process. The HCF with nanocage structure reduces the Li^(+) transport path and benefits the rapid Li^(+) migration, while 2D graphene network can promote the electron interconnecting of carbon nanocages. In addition, the doped N atoms in HCF facilitate to the adsorption of ions and enhance the pseudo contribution, thus accelerate the kinetics of the anode. The HCF anode delivers high specific capacity, remarkable rate capability. The LIC pouch-cell based on HCF anode and active HCF(a-HCF) cathode can provide a high energy density of 162 Wh kg^(-1) and a superior power density of 15.8 kW kg^(-1), as well as a long cycling life exceeding 15,000cycles. This study demonstrates that the well-defined design of hierarchical carbon framework by incorporating 0D carbon nanocages and 2D graphene network is an effective strategy to promote LIC anode kinetics and hence boost the LIC electrochemical performance.展开更多
In this work,we report the preparation of 1T'-MoS_(2)/g-C_(3)N_(4) nanocage(NC)heterostructure by loading 2D semi-metal noble-metal-free 1T'-MoS_(2) on the g-C_(3)N_(4) nanocages(NCs).DFT calculation and exper...In this work,we report the preparation of 1T'-MoS_(2)/g-C_(3)N_(4) nanocage(NC)heterostructure by loading 2D semi-metal noble-metal-free 1T'-MoS_(2) on the g-C_(3)N_(4) nanocages(NCs).DFT calculation and experimental data have shown that the 1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure has a stronger light absorption capacity and larger specific surface area than pure g-C_(3)N_(4) NCs and g-C_(3)N_(4) nanosheets(NSs),and the presence of the co-catalysts 1T'-MoS_(2) can effectively inhibit the photoinduced carrier recombination.As a result,the 1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure with an optimum 1T'-MoS_(2) loading of 9 wt%displays a hydrogen evolution rate of 1949 mmol h^(-1) g^(-1),162.4,1.2,1.5,1.6 and 1.2 times than pure g-C_(3)N_(4) NCs(12 mmol h^(-1) g^(-1)),Pt/g-C_(3)N_(4) NCs(1615 mmol h^(-1) g^(-1))and Pt/g-C_(3)N_(4) nanosheets(NSs,1297 mmol h^(-1) g^(-1)),1T'-MoS_(2)/g-C_(3)N_(4) nanosheets(1216 mmol h^(-1) g^(-1))and 2H-MoS_(2)/g-C_(3)N_(4) nanocages(1573 mmol h^(-1) g^(-1)),respectively,and exhibits excellent cycle stability.Therefore,1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure is a suitable photocatalyst for green H_(2) production.展开更多
A facile hydrolysis method was applied to fabricate high-performance Co-layered double hydroxide（LDH）nanocages/graphene composites for supercapacitors. The materials exhibit enhanced rate capability than the counter...A facile hydrolysis method was applied to fabricate high-performance Co-layered double hydroxide（LDH）nanocages/graphene composites for supercapacitors. The materials exhibit enhanced rate capability than the counterpart electrode free of graphene while maintaining a high specific capacitance. In addition,such Co-LDH nanocages/graphene composites display an excellent cycling stability; the capacitance retention of Co-LDH nanocages/graphene composite electrode remains 90.4% after 10000 cycles at a current density of 2 A g（-1）. The integration of high capacity of double hydroxide and outstanding conductivity of graphene makes the delicately-designed composites promising candidates for electrode materials for supercapacitors.展开更多
The conventional Li–O2 battery(LOB)has hardly been considered as a next-generation flexible electronics thus far,since it is bulk,inflexible and limited by the absence of an adjustable cell configuration.Here,we pres...The conventional Li–O2 battery(LOB)has hardly been considered as a next-generation flexible electronics thus far,since it is bulk,inflexible and limited by the absence of an adjustable cell configuration.Here,we present a flexible Li–O2 cell using N-doped carbon nanocages grown onto the carbon textiles(NCNs/CTs)as a self-standing and binder-free O2 electrode.The highly flexible NCNs/CTs exhibits an excellent mechanic durability,a promising catalytic activity towards the ORR and OER,a considerable cyclability of more than 70 cycles with an overpotential of 0.36 V on the 1 stcycle at a constant current density of 0.2 m A/cm2,a good rate capability,a superior reversibility with formation and decomposition of desired Li2 O2,and a highly electrochemical stability even under stringent bending and twisting conditions.Our work represents a promising progress in the material development and architecture design of O2 electrode for flexible LOBs.展开更多
According to density functional theory, we investigate the effects of BF3, BF4, BCI3, A1F3, AICI3, A1Br3, 13eF3, GaF3, GaC13, GaBr3, NO3, BS2, BSO, BO2, F2, PFs, PC15, and ASF5 molecules on the geometric, electronic, ...According to density functional theory, we investigate the effects of BF3, BF4, BCI3, A1F3, AICI3, A1Br3, 13eF3, GaF3, GaC13, GaBr3, NO3, BS2, BSO, BO2, F2, PFs, PC15, and ASF5 molecules on the geometric, electronic, linear, and nonlinear optical properties of an Mg12012 nanocage. The thermodynamic stability and feasibility of the adsorption process are investigated by analyzing the free energy. It is shown that the adsorptions of almost all molecules on the Mg12OI2 surface are exothermic. The calculations of the polarizability of these nanoclusters show that among the studied molecules, BeF3 has the largest influence on the polarizability value （a≈315 a.u., the unit a.u. is short for atomic unit）. The static first hyperpolarizability （β0） value is increased in the presence of these superhalogens. This increase is greatest for BeF3 and BF4 of which the highest value of the first hyperpolarizability （βO≈ 5775 a.u.） is related to a BeF3_c（e@Mgl2Ol2） nanocluster. The adsorption position is a key to estimating the value of increasing the first hyperpolarizability.展开更多
The intrinsic poor electrical conductivity,severe dissolution of K x S y intermediates,and inferior conversion reaction reversibility extremely impede the practical application of the transition-metal chalcogenides(TM...The intrinsic poor electrical conductivity,severe dissolution of K x S y intermediates,and inferior conversion reaction reversibility extremely impede the practical application of the transition-metal chalcogenides(TMDs)anode for potassium-ion batteries(PIBs).Herein,a rationally designed Cu_(9)S_(5)/MoS_(2)/C heterostruc-ture hollow nanocage was synthesized with assistance from metal-organic frameworks(MOFs)precursor.During the K-storage process,the homogeneously distributed the sulfiphilic nature of Cu 0 reaction prod-uct could act as a dual-functional catalyst,not only facilitating the rapid charge transfer but also effec-tively anchoring(K x S y)polysulfides,thus boosting K-storage reactions reversibility during the conversion reaction process.When applied as an anode for PIBs,the as-prepared heterostructure exhibits excellent reversible capacity and long cycle lifespan(350.5 mAh g^(-1)at 0.1 A g^(-1)and 0.04%per cycle capacity de-cay at 1 A g^(-1)after 1000 cycles).Additionally,the potassium storage mechanism is distinctly revealed by in-situ characterizations.The nanoarchitecture designing strategy for the advanced electrode in this work could provide vital guidance for relevant energy storage materials.展开更多
Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is critical.This study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon na...Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is critical.This study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron transfer.The surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·L^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.展开更多
Developing Earth-abundant,highly efficient,and anticorrosion electrocatalysts to boost the oxygen evolution reaction(OER),oxygen reduction reaction(ORR),and hydrogen evolution reaction(HER) for the Zn–air battery(ZAB...Developing Earth-abundant,highly efficient,and anticorrosion electrocatalysts to boost the oxygen evolution reaction(OER),oxygen reduction reaction(ORR),and hydrogen evolution reaction(HER) for the Zn–air battery(ZAB) and for overall water splitting is imperative.In this study,a novel process starting with Cu2O cubes was developed to fabricate hollow NixCo1-xSe nanocages as trifunctional electrocatalysts for the OER,ORR,and HER and a reasonable formation mechanism was proposed.The Ni0.2Co0.8Se nanocages exhibited higher OER activity than its counterparts with the low overpotential of 280 mV at 10 mA cm-2.It also outperformed the other samples in the HER test with a low overpotential of 73 mV at 10 mA cm-2.As an air–cathode of a self-assembled rechargeable ZAB,it exhibited good performance,such as an ultralong cycling lifetime of > 50 h,a high round-trip efficiency of 60.86%,and a high power density of 223.5 mW cm-2.For the application in self-made all-solid-state ZAB,it also demonstrated excellent performance with a power density of 41.03 mW cm-2 and an open-circuit voltage of 1.428 V.In addition,Ni0.2Co0.8Se nanocages had superior performance in a practical overall water splitting,in which only 1.592 V was needed to achieve a current density of 10 mA cm-2.These results show that hollow NixCo1-xSe nanocages with an optimized Ni-to-Co ratio are a promising cost-effective and high-efficiency electrocatalyst for ZABs and overall water splitting in alkaline solutions.展开更多
Vapreotide acetate （Vap） was used as a biotemplate to synthesize silver nanocages through direct co-incubation of a AgNO3 solution, following by reduction using fresh NaBH4. The characterized vapreotide-templated si...Vapreotide acetate （Vap） was used as a biotemplate to synthesize silver nanocages through direct co-incubation of a AgNO3 solution, following by reduction using fresh NaBH4. The characterized vapreotide-templated silver nanocages （Vap-AgNCs） presented a wide and red shifted absorption band with a maximum between 480 nm and 800 nm and possessed a uniform structure with a face-centered cubic crystal structure. The biocompatibiliW of Vap-AgNCs was assessed using the MTT method, indicating Vap-AgNCs had better biocompatibility when its concentration was lower than 2,5 × 10-4 mmol. L- 1. The photothermal characteristics of Vap-AgNCs were analyzed with laser irradiation （808 nm, 1,5 W, cm-2） and the results showed that the temperature of the Vap- AgNCs solution reached 45 ℃ starting from 25 ℃ within 5 min. Additionally, Vap-AgNCs with a laser led to HeLa cell death. Therefore, the prepared Vap-AgNCs is expected to be an effective photothermal therapy agent.展开更多
We report on the successful synthesis of cadmium sulfide （CdS） nanocages by laser ablation of bulk Cd target in thioacetamide （TAA） solution. The CdS nanocages exhibit obvious interior hollow spaces and distinctiv...We report on the successful synthesis of cadmium sulfide （CdS） nanocages by laser ablation of bulk Cd target in thioacetamide （TAA） solution. The CdS nanocages exhibit obvious interior hollow spaces and distinctive porous-shell structures. After laser ablation of Cd target in liquid condition, the unique structure should be attributed to the initial forma- tion of Cd micro-gas bubble via a model of micro-explosive boiling model. Surprisingly, the obtained CdS nanocages can provide a super-adsorption of methyl blue （MB） solution. The maximum adsorption capacity reaches up to 11813.3 mg/g, which is much higher than that reported in many previous researches. Without using any complicated stabilizers or soft directing agents, the pure CdS nanocages fabricated by laser ablation will serve as advanced absorbents in further research.展开更多
Discrete and symmetric three-dimensional（3D） DNA nanocages have been revoked as excellent candidates for various applications,such as vip component encapsulation and organization（e.g.dye molecules,proteins,inorga...Discrete and symmetric three-dimensional（3D） DNA nanocages have been revoked as excellent candidates for various applications,such as vip component encapsulation and organization（e.g.dye molecules,proteins,inorganic nanoparticles,etc.） to construct new materials and devices.To date,a large variety of DNA nanocages has been synthesized through assembling small individual DNA motifs into predesigned structures in a bottom-up fashion.Most of them rely on the assembly using multiple copies of single type of motifs and a few sophisticated nanostructures have been engineered by co-assembling multi-types of DNA tiles simultaneously.However,the availability of complex DNA nanocages is still limited.Herein,we demonstrate that highly symmetric DNA nanocages consisted of binary DNA pointstar motifs can be easily assembled by deliberately engineering the sticky-end interaction between the component building blocks.As such,DNA nanocages with new geometries,including elongated tetrahedron（E-TET）,rhombic dodecahedron（R-DOD）,and rhombic triacontahedron（R-TRI） are successfully synthesized.Moreover,their design principle,assembly process,and structural features are revealed by polyacryalmide gel electrophoresis（PAGE）,atomic force microscope（AFM） imaging,and cryogenic transmission electron microscope imaging（cryo-TEM） associated with single particle reconstruction.展开更多
基金supported by the National Natural Science Foundation of China(51874039).
文摘The utilization of seawater,a plentiful and cost-effective resource,instead of freshwater for H_(2)production through electrolysis has garnered significant attention.Herein,we present the synthesis of open-structured Fe-Co phosphide(FCP)nanocages for the overall seawater electrolysis,employing metallurgical solid waste(steel rolling sludge,SRS)as the precursor material.The FCP nanocages demonstrate exceptional catalytic activity for the hydrogen evolution reaction(HER)in all pH scales,achieving performance comparable to that of Pt/C catalysts at high current densities,The electrolyzer assembled with FCP‖FCP requires 1.57 and 1.68 V to achieve current densities of 10 and 100 mA cm^(-2),respectively.Furthermore,the assembled FCP electrolyzer showcases over 100 h of cycling stability and nearly 100%Faradaic efficiency.Crucially,it can be powered by commercially available silicon solar panels,operating under an intensity of 100 mW cm^(-2),and by wind-driven sources,rendering it highly promising for real-world applications,The seawater hydrogen evolution system coupled with levofloxacin(LEV)degradation was constructed for the first time.The oxidation potential of LEV oxidation reaction(LEVOR)was significantly lower than that of oxygen evolution reaction(OER),indicating that the LEV degradation reaction occurred preferentially and achieved a removal efficiency of 98.57%within 60 min.This study provides effective strategies for valorizing SRS and offers insights into the fabrication of highperformance catalysts.
基金supported by the National Natural Science Foundation of China(No.22278202).
文摘For the effective treatment of the wastewater with low-medium concentration ammonia nitrogen and low strength COD,a high-performance Co_(3)O_(4) catalyst supported on carbon nanocages(CNCs)was prepared.By isovolumetric im pregnation,Co_(3)O_(4) could be uniformly dispersed on surface of CNCs,which possess tiny particle size and strong electron transfer capability.The catalytic performance of the prepared Co_(3)O_(4)/CNCs catalysts with different Co_(3)O_(4) loadings was systematically evaluated and compared with Co_(3)O_(4)/CNTs.It is found that 20 wt.%Co_(3)O_(4)/CNCs shows the best catalytic performance,achieving an ammonia nitrogen conversion rate of 71.0%and a nitrogen selectivity of 81.8%.Compared to commonly used Co_(3)O_(4),ammonia conversion and nitrogen selectivity of Co_(3)O_(4)/CNCs increased by 28.9%and 15.8%respectively.In the five consecutive cycles,the catalytic activity remained stable.The mechanism that CNCs support effectively increases the surface oxygen vacancies of Co_(3)O_(4) through XPS analysis was also elucidated,and DFT calculations confirm strong electron transfer between CNCs and Co_(3)O_(4),rendering Co_(3)O_(4) nanoparticles as the primary catalytic active sites.The results may contribute to the development of highperformance catalytic ozone oxidation catalysts for ammonia nitrogen.
基金financially supported by National Natural Science Foundation of China (Nos. 21902078, 22279062, 22232004,22072067)the supports from National and Local Joint Engineering Research Center of Biomedical Functional Materialsa project sponsored by the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Shape control of nickel sulfide(NiS_(2))catalysts is beneficial for boosting their catalytic performances,which is vital to their practical application as a class of advanced non-noble electro-catalysts.However,precisely controlling the formation kinetics and fabricate ultrathin NiS_(2)nanostructures still remains challenge.Herein,we provide an injection rate-mediated method to fabricate ultrathin NiS_(2)nanocages(HNCs)with hierarchical walls,high-density lattice defects and abundant grain boundaries(GBs).Through mechanism analysis,we find the injection rate determines the concentration of S_(2)−in the steady state and thus control the growth pattern,leading to the formation of NiS_(2)HNCs at slow etching kinetics and NiCo PBA@NiS_(2)frames at fast etching kinetics,respectively.Benefiting from the ultrathin and hierarchical walls that minimize the mass transport restrictions,the high-density lattice defects and GBs that offer abundant unsaturated reaction sites,the NiS_(2)HNCs exhibit obviously enhanced electrocatalytic activity and stability toward OER,with overpotential of 255mV to reach 10mA/cm^(2)and a Tafel slope of 27.44mV/dec,surpassing the performances of NiCo PBA@NiS_(2)frames and commercial RuO_(2).
基金supported by the National Natural Science Foundation of China(NSFC,No.21774045)。
文摘Rational design of complex hollow nanostructures offers a great opportunity to construct various functional nanostructures.A novel in situ disassembly-polymerization-pyrolysis approach was developed to synthesize atomically dispersed Fe single atoms(Fe SAs)and tiny Co nanoparticles(Co NPs)binary sites embedded in double-shelled hollow carbon nanocages(Co NPs/Fe SAs DSCNs)without removing excess templates.The Co NPs/Fe SAs DSCNs displayed excellent bifunctional activity,boosting the realistic rechargeable zinc-air batteries with high efficiency,long-term durability,and reversibility,which is comparable to noble metal catalysts(Pt/C and RuO_(2)).The enhanced catalytic activity should be attributed to as well as the strong interactions between Fe SAs and Co NPs with the nitrogen-doped carbon matrix,the exposure of more active sites,and the high-flux mass transportation.In addition,the confinement effect between the double C–N shells prevented the aggregation and corrosion of metal atoms,thus improving the durability of the Co NPs/Fe SAs DSCNs,further highlighting the structural advantages of carbon nanoreactor.This work provides guidance for further rational design and preparation of complex hollow structure materials with advanced bifunctional air cathodes.
基金supported by the National Research Foundation of Korea(NRF)and the Commercialization Promotion Agency for R&D Outcomes(COMPA)funded by the Ministry of Science and ICT(Nos.RS-2023-00217581 and RS-2023-00304768).
文摘CoFe-Prussian blue analog(CoFe-PBA)template derived porous nanocages comprising hollow(Co,Fe)O nanoparticles are introduced as a highly efficient anode for lithium-ion batteries(LIBs)by integrat-ing the co-precipitation and nanoscale Kirkendall diffusion processes.This strategic approach employs a solution-based facile polydopamine(PDA)-derived carbon coating process to control the oxidation rate of nanoparticles during subsequent heat treatment to achieve the hollow structure by the nanoscale Kirk-endall diffusion effect.The application of different concentrations of PDA to the nanocages resulted in the formation of porous nanocages of three types,such as(Co,Fe)O@PDA-C-20,(Co,Fe)O@PDA-C-100,and(Co,Fe)O@PDA-C-200.Notably,(Co,Fe)O@PDA-C-100 porous nanocages exhibit remarkable cycling stability by the hollow structured(Co,Fe)O nanoparticles.Additionally,the hollow and porous structures facilitate rapid charge species diffusion,efficient electrolyte infiltration,and effective management of volumetric changes.When used as anodes for LIBs,the hollow(Co,Fe)O@PDA-C-100 anodes demonstrate impressive structural robustness and high-rate performance.They exhibit remarkable structural integrity,demon-strating stable cycling performance for up to 300 cycles at 0.5 and 1.0 A g^(-1)(capacity retentions of 99.3%and 97.2%,respectively).In terms of rate capability,the hollow(Co,Fe)O@PDA-C-100 porous nanocages exhibit a high discharge capacity of 284 mA h g^(-1) at 10 A g^(-1).Moreover,the practical application po-tential of the prepared hollow(Co,Fe)O@PDA-C-100 anode is demonstrated by a full-cell test paired with and Li(Ni0.8Co0.1Mn0.1)O2 cathode under the condition of practical application.This clearly highlights the structural advantages of the prepared hollow(Co,Fe)O@PDA-C-100 porous nanocages.
基金financial support from the National Natural Science Foundation of China (21773111, 21473089, 21573107 and 51571110)the National Key Research and Development Program of China (2017YFA0206503, 2018YFA0209103)+1 种基金Priority Academic Program Development of Jiangsu Higher Education Institutions, Fundamental Research Funds for the Central Universitiesthe program B for outstanding PhD candidate of Nanjing University (201702B049)
文摘Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is critical for rechargeable metal-air batteries. Herein, we report a new 3D hierarchical sulfur and nitrogen co-doped carbon nanocages(hSNCNC) as a promising bifunctional oxygen electrocatalyst by an in-situ MgO template method with pyridine and thiophene as the mixed precursor. The as-prepared h SNCNC exhibits a positive half-wave potential of 0.792 V(vs. reversible hydrogen electrode, RHE) for ORR, and a low operating potential of 1.640 V at a 10 mA cm-2 current density for OER. The reversible oxygen electrode index is 0.847 V, far superior to commercial Pt/C and IrO2,which reaches the top level of the reported bifunctional catalysts. Consequently, the hSNCNC as air cathodes in an assembled Zn-air battery features low charge/discharge overpotential and long lifetime. The remarkable properties arises from the introduced multiple heteroatom dopants and stable 3D hierarchical structure with multi-scale pores, which provides the abundant uniform high-active S and N species and efficient charge transfer as well as mass transportation. These results demonstrate the potential strategy in developing suitable carbon-based bi-/multi-functional catalysts to enable the next generation of the rechargeable metal-air batteries.
基金financially supported by the National Natural Science Foundation of China (No.52274294)the Fundamental Research Funds for the Central Universities (No.N2124007-1)。
文摘The design of electrode materials with specific structures is considered a promising approach for improving the performance of lithium-ion batteries(LIBs).In this paper,FeO/CoO hollow nanocages coated with a N-doped carbon layer(FCO@NC)was prepared using Fe-Co-based Prussian blue analogs(PBA)as a precursor.During the synthesis,dopamine was the carbon and nitrogen source.The reducing atmosphere was assured via NH_3/Ar,which regulated the vacancies in the structure of FCO@NC as well as increased its conductivity.When used as anode materials for LIBs,the FCO@NC nanocages deliver a high reversible capacity of 774.89 mAh·g^(-1)at 0.3 A·g^(-1)after200 cycles with a capacity retention rate of 80.4%and426.76 mAh·g^(-1)after 500 cycles at a high current density of 1 A·g^(-1).It is demonstrated that the hollow nanocage structure can effectively enhance the cycle stability,and the heat treatment in NH_(3)/Ar atmosphere contributes to the oxygen vacancy content of the electrode materials,further facilitating its conductivity and electrochemical performance.
基金This work was financially supported by the National Natural Science Foundation of China(Nos.21975206 and 21901206)the Foundation of Shaanxi Province Natural Science Basic Research Program(No.2020JQ-146)the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University。
文摘It is challenging to prepare a binary assembled metal-organic framework(MOF) by anisotropic epitaxial growth method. Besides, nanocages(NCs) with hollow structures are often constructed to improve microwave absorbing abilities. Herein, we combine the selective epitaxial growth and hollow engineering technologies to fabricate hybrid MOF-derived NCs. Benefiting from the unique nanocage/porous structure,complementary magnetic/dielectric components and suitable impedance matching characteristics, the optimized absorber(CoNi/TiO@PC-NCs) exhibits unique microwave absorbing properties. It is worth noting that the minimum reflection loss(RLmin) of the absorber reaches-65.3 dB, and the overall effective absorption bandwidth(EAB, RL <-10 dB) covers 15.1 GHz(2.9–18 GHz). The maximum EAB under a single thickness covers 4.4 GHz, displaying skipping dual-band coverages at both high and low frequencies. This work might provide a novel perspective for the synthesis of assembled MOF-derived absorbers.
基金the financial support by the National Science Foundation of China(51822706 and 52107234)Beijing Natural Science Foundation(JQ19012)+2 种基金the DNL Cooperation Fund,CAS(DNL201912 and DNL201915)Innovation Academy for Green Manufacture Fund(IAGM2020C02)Youth Innovation Promotion Association,CAS(Y2021052).
文摘Lithium-ion capacitors(LICs) combining the advantages of lithium-ion batteries and supercapacitors are considered a promising nextgeneration energy storage device. However, the sluggish kinetics of battery-type anode cannot match the capacitor-type cathode, restricting the development of LICs. Herein, hierarchical carbon framework(HCF) anode material composed of 0D carbon nanocage bridged with 2D graphene network are developed via a template-confined synthesis process. The HCF with nanocage structure reduces the Li^(+) transport path and benefits the rapid Li^(+) migration, while 2D graphene network can promote the electron interconnecting of carbon nanocages. In addition, the doped N atoms in HCF facilitate to the adsorption of ions and enhance the pseudo contribution, thus accelerate the kinetics of the anode. The HCF anode delivers high specific capacity, remarkable rate capability. The LIC pouch-cell based on HCF anode and active HCF(a-HCF) cathode can provide a high energy density of 162 Wh kg^(-1) and a superior power density of 15.8 kW kg^(-1), as well as a long cycling life exceeding 15,000cycles. This study demonstrates that the well-defined design of hierarchical carbon framework by incorporating 0D carbon nanocages and 2D graphene network is an effective strategy to promote LIC anode kinetics and hence boost the LIC electrochemical performance.
基金funding from the National Natural Science Foundation of China (No.51872173)Taishan Scholar Foundation of Shandong Province (No.tsqn201812068)+2 种基金Youth Innovation Technology Project of Higher School in Shandong Province (No.2019KJA013)Science and Technology Special Project of Qingdao City (No.20-3-4-3-nsh)the Opening Fund of State Key Laboratory of Heavy Oil Processing (No.SKLOP202002006)。
文摘In this work,we report the preparation of 1T'-MoS_(2)/g-C_(3)N_(4) nanocage(NC)heterostructure by loading 2D semi-metal noble-metal-free 1T'-MoS_(2) on the g-C_(3)N_(4) nanocages(NCs).DFT calculation and experimental data have shown that the 1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure has a stronger light absorption capacity and larger specific surface area than pure g-C_(3)N_(4) NCs and g-C_(3)N_(4) nanosheets(NSs),and the presence of the co-catalysts 1T'-MoS_(2) can effectively inhibit the photoinduced carrier recombination.As a result,the 1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure with an optimum 1T'-MoS_(2) loading of 9 wt%displays a hydrogen evolution rate of 1949 mmol h^(-1) g^(-1),162.4,1.2,1.5,1.6 and 1.2 times than pure g-C_(3)N_(4) NCs(12 mmol h^(-1) g^(-1)),Pt/g-C_(3)N_(4) NCs(1615 mmol h^(-1) g^(-1))and Pt/g-C_(3)N_(4) nanosheets(NSs,1297 mmol h^(-1) g^(-1)),1T'-MoS_(2)/g-C_(3)N_(4) nanosheets(1216 mmol h^(-1) g^(-1))and 2H-MoS_(2)/g-C_(3)N_(4) nanocages(1573 mmol h^(-1) g^(-1)),respectively,and exhibits excellent cycle stability.Therefore,1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure is a suitable photocatalyst for green H_(2) production.
基金Supports by the Jilin Province/Jilin University co-Construction Project-Funds for New Materials (SXGJSF2017-3, Branch2/440050316A36)the National Key R&D Program of China (2016YFA0200400)+2 种基金the NSFC (51372095), the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT)“Double-First Class” Discipline for Materials Science & Engineeringthe Special Funding for Academic Leaders
文摘A facile hydrolysis method was applied to fabricate high-performance Co-layered double hydroxide（LDH）nanocages/graphene composites for supercapacitors. The materials exhibit enhanced rate capability than the counterpart electrode free of graphene while maintaining a high specific capacitance. In addition,such Co-LDH nanocages/graphene composites display an excellent cycling stability; the capacitance retention of Co-LDH nanocages/graphene composite electrode remains 90.4% after 10000 cycles at a current density of 2 A g（-1）. The integration of high capacity of double hydroxide and outstanding conductivity of graphene makes the delicately-designed composites promising candidates for electrode materials for supercapacitors.
基金supported by National Key R&D Program of China(2016YFB0100500)Special fund of key technology research and development projects(20180201097GX)(20180201099GX)(20180201096GX)+5 种基金Jilin Province Science and Technology Department.The R&D Program of power batteries with low temperature and high energy,Science and Technology Bureau of Changchun(19SS013)Key Subject Construction of Physical Chemistry of Northeast Normal UniversityGeneral Financial Grant from the China Postdoctoral Science Foundation(Grant 2016M601363)Fundamental Research Funds for the Central Universities(Grant2412017QD011)Jilin Scientific and Technological Development Program(Grant 20180520143JH)National Natural Science Foundation of China(Grant 21805030)。
文摘The conventional Li–O2 battery(LOB)has hardly been considered as a next-generation flexible electronics thus far,since it is bulk,inflexible and limited by the absence of an adjustable cell configuration.Here,we present a flexible Li–O2 cell using N-doped carbon nanocages grown onto the carbon textiles(NCNs/CTs)as a self-standing and binder-free O2 electrode.The highly flexible NCNs/CTs exhibits an excellent mechanic durability,a promising catalytic activity towards the ORR and OER,a considerable cyclability of more than 70 cycles with an overpotential of 0.36 V on the 1 stcycle at a constant current density of 0.2 m A/cm2,a good rate capability,a superior reversibility with formation and decomposition of desired Li2 O2,and a highly electrochemical stability even under stringent bending and twisting conditions.Our work represents a promising progress in the material development and architecture design of O2 electrode for flexible LOBs.
文摘According to density functional theory, we investigate the effects of BF3, BF4, BCI3, A1F3, AICI3, A1Br3, 13eF3, GaF3, GaC13, GaBr3, NO3, BS2, BSO, BO2, F2, PFs, PC15, and ASF5 molecules on the geometric, electronic, linear, and nonlinear optical properties of an Mg12012 nanocage. The thermodynamic stability and feasibility of the adsorption process are investigated by analyzing the free energy. It is shown that the adsorptions of almost all molecules on the Mg12OI2 surface are exothermic. The calculations of the polarizability of these nanoclusters show that among the studied molecules, BeF3 has the largest influence on the polarizability value （a≈315 a.u., the unit a.u. is short for atomic unit）. The static first hyperpolarizability （β0） value is increased in the presence of these superhalogens. This increase is greatest for BeF3 and BF4 of which the highest value of the first hyperpolarizability （βO≈ 5775 a.u.） is related to a BeF3_c（e@Mgl2Ol2） nanocluster. The adsorption position is a key to estimating the value of increasing the first hyperpolarizability.
基金financially supported by the National Natural Science Foundation of China (Nos.52070194,52073309,51902347,and 51908555)the Natural Science Foundation of Hunan Province (Nos.2022JJ20069 and 2020JJ5741).
文摘The intrinsic poor electrical conductivity,severe dissolution of K x S y intermediates,and inferior conversion reaction reversibility extremely impede the practical application of the transition-metal chalcogenides(TMDs)anode for potassium-ion batteries(PIBs).Herein,a rationally designed Cu_(9)S_(5)/MoS_(2)/C heterostruc-ture hollow nanocage was synthesized with assistance from metal-organic frameworks(MOFs)precursor.During the K-storage process,the homogeneously distributed the sulfiphilic nature of Cu 0 reaction prod-uct could act as a dual-functional catalyst,not only facilitating the rapid charge transfer but also effec-tively anchoring(K x S y)polysulfides,thus boosting K-storage reactions reversibility during the conversion reaction process.When applied as an anode for PIBs,the as-prepared heterostructure exhibits excellent reversible capacity and long cycle lifespan(350.5 mAh g^(-1)at 0.1 A g^(-1)and 0.04%per cycle capacity de-cay at 1 A g^(-1)after 1000 cycles).Additionally,the potassium storage mechanism is distinctly revealed by in-situ characterizations.The nanoarchitecture designing strategy for the advanced electrode in this work could provide vital guidance for relevant energy storage materials.
基金financially supported by National Key Research and Development Program of China(No.2021YFA1401103)the National Natural Science Foundation of China(Nos.61825403,61921005 and 61904049)。
文摘Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is critical.This study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron transfer.The surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·L^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.
基金the Guangzhou Science and Technology Plan Projects(No.201804010323)the Guangdong Natural Science Funds for Distinguished Young Scholars(No.2015A030306006)+3 种基金the Guangdong Innovative and Entrepreneurial Research Team Program(No.2014ZT05N200)the Fundamental Research Funds for the Central Universities(SCUT Grant No.2018ZD022)the Project for Natural Science Foundation of Guangdong Province(No.2018A030313178)the funding support from the Natural Science Foundation of Guangdong Province(No.2015A030310176)
文摘Developing Earth-abundant,highly efficient,and anticorrosion electrocatalysts to boost the oxygen evolution reaction(OER),oxygen reduction reaction(ORR),and hydrogen evolution reaction(HER) for the Zn–air battery(ZAB) and for overall water splitting is imperative.In this study,a novel process starting with Cu2O cubes was developed to fabricate hollow NixCo1-xSe nanocages as trifunctional electrocatalysts for the OER,ORR,and HER and a reasonable formation mechanism was proposed.The Ni0.2Co0.8Se nanocages exhibited higher OER activity than its counterparts with the low overpotential of 280 mV at 10 mA cm-2.It also outperformed the other samples in the HER test with a low overpotential of 73 mV at 10 mA cm-2.As an air–cathode of a self-assembled rechargeable ZAB,it exhibited good performance,such as an ultralong cycling lifetime of > 50 h,a high round-trip efficiency of 60.86%,and a high power density of 223.5 mW cm-2.For the application in self-made all-solid-state ZAB,it also demonstrated excellent performance with a power density of 41.03 mW cm-2 and an open-circuit voltage of 1.428 V.In addition,Ni0.2Co0.8Se nanocages had superior performance in a practical overall water splitting,in which only 1.592 V was needed to achieve a current density of 10 mA cm-2.These results show that hollow NixCo1-xSe nanocages with an optimized Ni-to-Co ratio are a promising cost-effective and high-efficiency electrocatalyst for ZABs and overall water splitting in alkaline solutions.
基金Supported by the National Natural Science Foundation of China(21476190)Hebei Province Key Basic Research Fund(15961301D)
文摘Vapreotide acetate （Vap） was used as a biotemplate to synthesize silver nanocages through direct co-incubation of a AgNO3 solution, following by reduction using fresh NaBH4. The characterized vapreotide-templated silver nanocages （Vap-AgNCs） presented a wide and red shifted absorption band with a maximum between 480 nm and 800 nm and possessed a uniform structure with a face-centered cubic crystal structure. The biocompatibiliW of Vap-AgNCs was assessed using the MTT method, indicating Vap-AgNCs had better biocompatibility when its concentration was lower than 2,5 × 10-4 mmol. L- 1. The photothermal characteristics of Vap-AgNCs were analyzed with laser irradiation （808 nm, 1,5 W, cm-2） and the results showed that the temperature of the Vap- AgNCs solution reached 45 ℃ starting from 25 ℃ within 5 min. Additionally, Vap-AgNCs with a laser led to HeLa cell death. Therefore, the prepared Vap-AgNCs is expected to be an effective photothermal therapy agent.
基金supported by the National Natural Science Foundation of China(Grant Nos.11575102 and 11105085)the Fundamental Research Funds of Shandong University,China(Grant No.2015JC007)
文摘We report on the successful synthesis of cadmium sulfide （CdS） nanocages by laser ablation of bulk Cd target in thioacetamide （TAA） solution. The CdS nanocages exhibit obvious interior hollow spaces and distinctive porous-shell structures. After laser ablation of Cd target in liquid condition, the unique structure should be attributed to the initial forma- tion of Cd micro-gas bubble via a model of micro-explosive boiling model. Surprisingly, the obtained CdS nanocages can provide a super-adsorption of methyl blue （MB） solution. The maximum adsorption capacity reaches up to 11813.3 mg/g, which is much higher than that reported in many previous researches. Without using any complicated stabilizers or soft directing agents, the pure CdS nanocages fabricated by laser ablation will serve as advanced absorbents in further research.
基金financially supported by the National Natural Science Foundation of China(Nos.21504053,21673139,and91527304)the Program of Shanghai Medical Professionals Across Subject Funds(No.YG2016MS74)the Recruitment Program of Global Experts(No.15Z127060012)
文摘Discrete and symmetric three-dimensional（3D） DNA nanocages have been revoked as excellent candidates for various applications,such as vip component encapsulation and organization（e.g.dye molecules,proteins,inorganic nanoparticles,etc.） to construct new materials and devices.To date,a large variety of DNA nanocages has been synthesized through assembling small individual DNA motifs into predesigned structures in a bottom-up fashion.Most of them rely on the assembly using multiple copies of single type of motifs and a few sophisticated nanostructures have been engineered by co-assembling multi-types of DNA tiles simultaneously.However,the availability of complex DNA nanocages is still limited.Herein,we demonstrate that highly symmetric DNA nanocages consisted of binary DNA pointstar motifs can be easily assembled by deliberately engineering the sticky-end interaction between the component building blocks.As such,DNA nanocages with new geometries,including elongated tetrahedron（E-TET）,rhombic dodecahedron（R-DOD）,and rhombic triacontahedron（R-TRI） are successfully synthesized.Moreover,their design principle,assembly process,and structural features are revealed by polyacryalmide gel electrophoresis（PAGE）,atomic force microscope（AFM） imaging,and cryogenic transmission electron microscope imaging（cryo-TEM） associated with single particle reconstruction.
