This study investigates the electrochemical behavior of molybdenum disulfide(MoS_(2))as an anode in Li-ion batteries,focusing on the extra capacity phenomenon.Employing advanced characterization methods such as in sit...This study investigates the electrochemical behavior of molybdenum disulfide(MoS_(2))as an anode in Li-ion batteries,focusing on the extra capacity phenomenon.Employing advanced characterization methods such as in situ and ex situ X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,and transmission electron microscopy,the research unravels the complex structural and chemical evolution of MoS_(2) throughout its cycling.A key discovery is the identification of a unique Li intercalation mechanism in MoS_(2),leading to the formation of reversible Li_(2)MoS_(2) phases that contribute to the extra capacity of the MoS_(2) electrode.Density function theory calculations suggest the potential for overlithiation in MoS_(2),predicting Li5MoS_(2) as the most energetically favorable phase within the lithiation–delithiation process.Additionally,the formation of a Li-rich phase on the surface of Li_(4)MoS_(2) is considered energetically advantageous.After the first discharge,the battery system engages in two main reactions.One involves operation as a Li-sulfur battery within the carbonate electrolyte,and the other is the reversible intercalation and deintercalation of Li in Li_(2)MoS_(2).The latter reaction contributes to the extra capacity of the battery.The incorporation of reduced graphene oxide as a conductive additive in MoS_(2) electrodes notably improves their rate capability and cycling stability.展开更多
Polypropylene(PP)has low inherent susceptibility to common industrial lasers,which poses a significant challenge for laser-based marking.To improve the laser sensitivity of PP,molybdenum disulfide grafted with polysty...Polypropylene(PP)has low inherent susceptibility to common industrial lasers,which poses a significant challenge for laser-based marking.To improve the laser sensitivity of PP,molybdenum disulfide grafted with polystyrene(MoS_(2)-g-PS)was synthesized via in-situ free radical polymerization and used as a laser-sensitive filler for PP composites prepared by melt blending.The composites were then marked with a 1064 nm semiconductor laser,producing clear and legible patterns.The marked surfaces were characterized using scanning electron microscopy(SEM),transmission electron microscopy(TEM),colorimetry,Raman spectroscopy,and thermogravimetric analysis(TGA).The results demonstrate that the PP/MoS_(2)-g-PS composites exhibit significantly improved laser markability compared to both pure PP and PP/MoS_(2) composites,yielding superior marking quality.When the MoS_(2)-g-PS content was 0.02 wt%and the laser current intensity was 11 A,a clearly recognizable QR code pattern was obtained with high resolution and legibility.The mechanism of laser-induced marking on the PP/MoS_(2)-g-PS composites involves efficient absorption of near-infrared(NIR)laser energy and photothermal conversion by the MoS_(2) core,while the surrounding PS layer carbonizes upon laser irradiation.The synergistic effect between MoS_(2) and PS effectively enhance the laser marking performance of PP.展开更多
Molybdenum disulfide nanoflakes were synthesized by a simple hydrothermal process using sodium molybdate and thiourea as reactants at a relatively low temperature. X-ray diffraction(XRD) and transmission elec-tron mic...Molybdenum disulfide nanoflakes were synthesized by a simple hydrothermal process using sodium molybdate and thiourea as reactants at a relatively low temperature. X-ray diffraction(XRD) and transmission elec-tron microscopy(TEM) indicate that the samples have the structure of 2H-MoS2 and the morphology of nanoflakes with the average thickness around 5-10 nm. The results of electrochemical properties indicate that the morphology and size of MoS2 particles have effects on their capacity when they are used as the anode for lithium ion battery. The as-prepared MoS2 samples have high reversible discharge capacity up to 994.6 mA·h·g-1 for the MoS2-1 elec-trode and 930.1 mA·h·g-1 for the MoS2-2 electrode and show excellent cycling performances. The MoS2-1 electrode has a better cycling stability than the MoS2-2 electrode due to their difference in the uniformity of the samples.展开更多
Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive ...Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive application.There are limited approaches to exploit such anti-corrosion and mechanical properties of magnesium lithium alloys.Herein,the epoxy resin powder coating with polydopamine modified molybdenum disulfide(MoS_(2)@PDA-EP powder coating with 0,0.1,0.2,0.5,1.0 wt.%loading)was well prepared by melt extrusion to investigate its anticorrosion performance and wear resistance.The results revealed that the addition of MoS_(2)@PDA enhanced the adhesion strength between coatings and alloys,wear resistance and corrosion protection of the powder coatings.Among them,the optimum was obtained by 0.2 wt.%MoS_(2)@PDA-EP powder coating which could be attributed to well dispersion and efficient adhesion with coating matrix.To conclude,MoS_(2)@PDA-EP powder coating is meaningfully beneficial for the anticorrosive and wear performance improvement of magnesium lithium alloys.展开更多
Molybdenum disulfide(MoS_(2))-based materials as the non-noble metal catalysts have displayed the potential capability to drive electrocatalytic hydrogen evolution reaction(HER)for green hydrogen production along with...Molybdenum disulfide(MoS_(2))-based materials as the non-noble metal catalysts have displayed the potential capability to drive electrocatalytic hydrogen evolution reaction(HER)for green hydrogen production along with their intrinsic activity,tunable electronic properties,low cost,and abundance reserves,which have attracted intensive attention as alternatives to the low-abundance and high-cost platinum-based catalysts.However,their insufficient catalytic HER activities and stability are the major challenges for them to become practically applicable.Hereby,the MoS_(2)-based electrocatalysts for HER are comprehensively reviewed to explain the fundamental science behind the manipulations of the crystal structure,microstructure,surface,and interface of MoS_(2) in order to enhance its catalytic performance through changing the electrical conductivity,the number of active sites,surface wettability,and the Gibbs free energy for hydrogen adsorption(ΔGH).Recent studies in surface/interface engineering,such as phase engineering,defect engineering,morphology design,and heterostructure construction,are analyzed to reveal the state-of-the-art strategies for designing and preparing the cost-effective and highperformance MoS_(2)-based catalysts through optimizing the charge transfer,surface-active sites,ΔGH,and surface hydrophilicity.Lastly,the perspectives,challenges,and future research directions of HER electrocatalysis are also given to facilitate the further research and development of HER catalysts.展开更多
Molybdenum disulfide(MoS_(2)),a typical two-dimensional transition metallic layered material,attracts tremendous attentions in the electrochemical energy storage due to its excellent physicochemical properties.However...Molybdenum disulfide(MoS_(2)),a typical two-dimensional transition metallic layered material,attracts tremendous attentions in the electrochemical energy storage due to its excellent physicochemical properties.However,with the deepening of the research and exploration of the lithium storage mechanism of these advanced MoS_(2)-based anode materials,the complex reaction process influenced by internal and external factors hinders the exhaustive understanding of the lithium storage process.To design stable anode material with high performance,it is urgent to review the mechanisms of reported anode materials and summarize the related factors that influence the reaction processes.This review aims to dissect all possible side reactions during charging and discharging process,uncover internal and external factors inducing various anode reactions and finally put forward strategies of controlling high cycling capacity and super-stable lithium storage capability of MoS_(2).This review will be helpful to the design of MoS_(2)-based lithium-ion batteries(LIBs) with excellent cycle performance to enlarge the application fields of these advanced electrochemical energy storage devices.展开更多
The hierarchical structure of molybdenum disulfide(MoS2)nanosheet arrays stemmed from nickelcobalt layered double hydroxide(NiCo-LDH)/carbon cloth was prepared by growing the MoS_(2) nanosheet arrays onto the NiCo-LDH...The hierarchical structure of molybdenum disulfide(MoS2)nanosheet arrays stemmed from nickelcobalt layered double hydroxide(NiCo-LDH)/carbon cloth was prepared by growing the MoS_(2) nanosheet arrays onto the NiCo-LDH template which was pre-deposited onto the carbon cloth substrate.In this electrode configuration,carbon cloth is the three dimensional and conductive skeleton;NiCo-LDH nanosheets,as the template,ensure the oriented growth of MoS2 nanosheet arrays.Therefore,more MoS_(2) active sites are exposed and the catalyst exhibits good hydrogen evolution reaction activity.展开更多
Ti_(3)C_(2)T_(x)MXene fiber has shown extraordinary potential for supercapacitor electrode in wearable elec-tronics and textile energy storage,but realizing high energy density and practical-powered applications remai...Ti_(3)C_(2)T_(x)MXene fiber has shown extraordinary potential for supercapacitor electrode in wearable elec-tronics and textile energy storage,but realizing high energy density and practical-powered applications remains a great challenge.Here,we report a covalent-architected molybdenum disulfide-Ti_(3)C_(2)T_(x)(MoS_(2)-Ti_(3)C_(2)T_(x))core-shell fiber for high-performance supercapacitor.Benefiting from the microfluidic and micro-reaction strategies,the ordered MoS_(2)arrays are strongly bridged on Ti_(3)C_(2)T_(x)fiber via Ti-O-Mo bond,re-sulting in large exposed surface,enhanced porosity and excellent interfacial conduction for charges high diffusion and faradaic transfer.The MoS_(2)-Ti_(3)C_(2)T_(x)fiber exhibits ultra-large capacitance of 2028 F cm^(-3)and admirable reversibility in 1 M H_(2)SO_(4)aqueous electrolyte.Meanwhile,MoS_(2)-Ti_(3)C_(2)T_(x)fiber-based solid-state supercapacitor presents high energy density of 23.86 mWh cm^(-3),capacitance of 1073.6 F cm^(-3)and superior cycling ability of 92.13%retention after 20,000 cycles,which can realize stable energy supply for wearable watch,LEDs,electric fans,toy ship and self-powered devices.Our work may provide an insight-ful guidance for the advanced design of structural fiber towards robust new energy and next-generation wearable industry.展开更多
Two-dimensional materials(2DMs) have attracted substantial attention due to their abundant active sites and their ultrahigh surface area for different catalytic applications due to the high lateral-longitudinal ratio....Two-dimensional materials(2DMs) have attracted substantial attention due to their abundant active sites and their ultrahigh surface area for different catalytic applications due to the high lateral-longitudinal ratio. Transition metal dichalcogenides(TMDs), especially MoS2, as one of the 2DMs most often studied, have shown superior activity in electrochemical applications. Recently, combinations of different 2DMs have been widely studied, and they appear to be the most promising strategy available to develop state of the art catalysts for different reactions.In this article, we review the interactions between MoS2 and other materials as well as the novel assembly induced phase transitions of TMDs and their underlying mechanisms. Several methods for inducing the phase transition of TMDs by building MoS2-based heterostructures have been introduced. The electronic coupling between these counterparts has significantly enhanced their conductivity and optimized the energy states of the materials, thus introducing enhanced activity as compared to their original counterparts. The ideas summarized in this article may shed new light on and help to develop next-generation green energy materials by designing and constructing highly active two-dimensional catalysts for efficient water splitting.展开更多
A series of non-covalently functionalized molybdenum disulfide-silica(f-MoS_(2)-SiO_(2))nanocomposites was prepared by an in-situ assembled method and used to fabricate the oriented molybdenum disulfide-SiO_(2)/Hydrog...A series of non-covalently functionalized molybdenum disulfide-silica(f-MoS_(2)-SiO_(2))nanocomposites was prepared by an in-situ assembled method and used to fabricate the oriented molybdenum disulfide-SiO_(2)/Hydrogenated Nitrile Butadiene Rubber(f-MoS2-SiO_(2)/HNBR)composites.The characterization results show the synergistic dispersion between the functionalized molybdenum disulfide(f-MoS2)nanosheets and SiO_(2)nanoparticles.The addition of f-MoS2 nanosheets can improve the dispersion of fillers in the rubber matrix and weaken the filler network.The non-covalently functionalization improves the interface interaction between f-MoS_(2)nanosheets and the rubber matrix.Furthermore,the tensile strength of f-MoS2-SiO_(2)/HNBR is 65.9%higher than that of SiO_(2)/HNBR by adding 1.0wt%of f-MoS_(2).At the same time,the dielectric constant of f-MoS2-SiO_(2)/HNBR is increased by 23.7%compared to SiO_(2)/HNBR due to the micro-capacitor structure of parallel f-MoS2 nanosheets in the rubber matrix.Our work provides new ideas for the development of high-performance elastomer materials.展开更多
Molybdenum disulfide(MoS_(2))has excellent trapping ability for lead ions whereas its micro-/nanoscale size has greatly impeded its practical applications in the flow-through systems.Herein,a millimetersized nanocompo...Molybdenum disulfide(MoS_(2))has excellent trapping ability for lead ions whereas its micro-/nanoscale size has greatly impeded its practical applications in the flow-through systems.Herein,a millimetersized nanocomposite MoS_(2)-001 was synthesized for Pb^(2+)removal by loading MoS_(2) nanosheets into a polystyrene cation exchanger D-001 by a facile hydrothermal method.The proposed structure and adsorption mechanism of MoS_(2)-001 was confirmed by the scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and X-ray photoelectron spectro scopy(XPS)analysis.The nanocomposite showed outstanding adsorption capacity and rapid adsorption kinetic for Pb^(2+)removal,and the adsorption behavior followed the Langmuir adsorption model and pseudo-firstmodel kinetic model.Pb^(2+)uptake by MoS_(2)-001 still maintains a high level even in the presence of extremely highly competitive ions(Ca(Ⅱ)and Mg(Ⅱ)),suggesting its high selectivity for Pb^(2+)adsorption.Besides,the fixed-bed column experiments further certified that MoS_(2)-001 is of great potential for Pb^(2+)removal from the wastewater in practical engineering applications.Even more gratifying is that the exhausted MoS_(2)-001 can be regenerated by NaCl-EDTANa_(2) solution without any significant adsorption capacity loss.Consequently,all the results indicated that MoS_(2)-001 is a promising candidate adsorbent for lead-containing wastewater treatment.展开更多
High-performance dielectric polymer composites have received increasing attention due to their important applications in the field of energy storage.The rational structural design of hybrid fillers can lead to a balan...High-performance dielectric polymer composites have received increasing attention due to their important applications in the field of energy storage.The rational structural design of hybrid fillers can lead to a balance between high dielectric constant and insulation in composites.In this work,novel hybrid fillers were fabricated by in situ synthesizing one-dimensional polypyrrole nanowires(PPynws)on the twodimensional molybdenum disulfide(MoS_(2)),which integrated the good ion polarization ability of PPynws and the high insulation and adjustable band gap of MoS_(2).Compared with the binary poly(vinylidene fluoride)(PVDF)/MoS_(2) composites,the PVDF/MoS_(2)-PPynws composites exhibited remarkably improved dielectric constant and breakdown strength,while the dielectric loss was still maintained at a low level.An optimal ternary composite with 1 wt%MoS_(2)-PPynws showed a high dielectric constant(15@1kHz),suppressed dielectric loss(0.027@1kHz),and high breakdown strength(422.1 MV/m).PPynws inducing strong interfacial polarization and the highly insulated MoS_(2) nanosheets extending the breakdown path mainly contributed to the synchronously enhanced dielectric constant and breakdown strength.This intriguing synthesis method of PVDF/MoS_(2)-PPynws nanocomposite will open up new opportunities for fabricating nanostructured polymer composites to produce high dielectric materials.展开更多
Zero-dimensional environmentally friendly carbon quantum dots(CQDs)combined with two-di-mensional materials have a wide range of applications in optoelec-tronic devices.We combined steady-state and transient absorp-ti...Zero-dimensional environmentally friendly carbon quantum dots(CQDs)combined with two-di-mensional materials have a wide range of applications in optoelec-tronic devices.We combined steady-state and transient absorp-tion spectroscopies to study the energy transfer dynamics between CQDs and molybdenum disulfide(MoS_(2)).Transient absorption plots showed photoinduced absorption and stimulated emission features,which involved the intrinsic and defect states of CQDs.Adding MoS_(2)to CQDs solution,the lowest unoccupied molecular orbital of CQDs transferred energy to MoS_(2),which quenched the intrinsic emission at 390 nm.With addition of MoS_(2),CQD-MoS_(2)composites quenched defect emission at 490 nm and upward absorption,which originated from another energy transfer from the defect state.Two energy transfer paths between CQDs and MoS_(2)were efficiently manipulated by changing the concentration of MoS_(2),which laid a foundation for improving device performance.展开更多
The acoustic-phonon emission from monolayer molybdenum disulfide(ML-MoS_(2))driven by a direct-current electric field is studied theoretically using the Boltzmann equation method.It is found that the Cerenkov emission...The acoustic-phonon emission from monolayer molybdenum disulfide(ML-MoS_(2))driven by a direct-current electric field is studied theoretically using the Boltzmann equation method.It is found that the Cerenkov emission of terahertz acoustic-phonons can be generated when a very weak electric field is applied to ML-MoS_(2).The physical mechanisms of acoustic-phonon emission are analyzed from the perspective of condensed matter physics.The acoustic-phonon emission from ML-MoS_(2)is also compared with those from graphene and GaAs.The results reveal that the frequencies of acousticphonons generated by ML-MoS_(2)are between the frequencies of those generated from GaAs and graphene.The results of this work suggest that the ML-MoS_(2)can make up for graphene and GaAs in respect of acoustic-phonon emission and be used in tunable hypersonic devices such as terahertz sound sources.展开更多
The properties of a metal-oxide-semiconductor device on a single layer MoS_(2)(molybdenum disulfide)semiconductor are determined theoretically utilizing the concept of physics that the carrier effective masses in mate...The properties of a metal-oxide-semiconductor device on a single layer MoS_(2)(molybdenum disulfide)semiconductor are determined theoretically utilizing the concept of physics that the carrier effective masses in materials are related to the intrinsic Fermi energy levels in materials by the universal mass-energy equivalence equation given as dE/E=dm/m,where E is the energy and m is the mass of the free electron.The known parameters of electron effective mass of 0.48 m and the direct bandgap of 1.8 eV for monolayer MoS_(2) semiconductor are utilized to determine the properties of the MOS(metal-oxide-semiconductor)device,with the given previous research consequence that the threshold for electron heating in SiO_(2) is 2 MV/cm-eV.展开更多
Molybdenum disulfide(MoS_(2))has been widely employed in microelectronic devices,photoelectric detections,and lubricants.However,the poor oxidation resistance and interfacial bonding ability restrict its high-performa...Molybdenum disulfide(MoS_(2))has been widely employed in microelectronic devices,photoelectric detections,and lubricants.However,the poor oxidation resistance and interfacial bonding ability restrict its high-performance applications.In this work,a largely unexplored strategy by direct gas fluorination reaction is applied to rapidly fabricate high-quality fluorinated MoS_(2)(FMoS_(2)).It has been demonstrated that the controllable fluorination is guided to solely eliminate unstable oxygen groups at the edge of MoS_(2)nanosheet rather than damage intact plane structure,which thus maintains pristine crystal structure and specifically introduces stable fluorine-containing groups at the edge,significantly strengthening the oxidation resistance ability.Meanwhile,the introduced fluorine with strongest electronegativity and fluorination-induced more S-vacancies can produce strong interactions with metal atoms,thereby synergistically strengthening interfacial bonding with metal substrate.As a typical application verification,FMoS_(2)exhibits obviously enhanced lubricating performances than that of pristine MoS_(2)because of enhanced oxidation resistance and interfacial bonding ability,accompanied by 50.2%and 74%decrease in friction coefficient and wear rate,respectively.This work offers a direct,rapid and controllable fluorination strategy to solve the long-standing challenges in significant MoS_(2)application fields,which also presents the universal potential to optimize other important two-dimensional(2D)materials toward high-performance applications at harsh environments.展开更多
With the development of nanotechnology,“nanozymes”,a kind of nanomaterials with high enzyme-like activity,have attracted much attention because of their exciting and extensive applications.As an emerging layered nan...With the development of nanotechnology,“nanozymes”,a kind of nanomaterials with high enzyme-like activity,have attracted much attention because of their exciting and extensive applications.As an emerging layered nanomaterial,molybdenum disulfide(MoS_(2)),which has unique chemical and physical properties,has been used to construct nanozymes with diff erent compositions,structures,and morphologies.Moreover,MoS_(2)-based nanozymes have been widely applied in sensing,catalysis,and disease diagnosis.Herein,the applications of MoS_(2)-based nanozymes in the sensing field are summarized.First,the preparation of MoS_(2)-based nanozymes,including noble metal nanoparticle-,carbon-based material-,and organic molecule-hybridized nanozymes,is introduced.The recent advances in MoS_(2)-based nanozymes used in sensing applications,including environmental monitoring,biochemical analysis,and disease diagnosis,are systematically discussed.Finally,the challenges and opportunities for MoS_(2)-based nanozymes in the future are also discussed.展开更多
Electrochemical nitrate reduction reaction(NITRR)has emerged as a promising approach for both nitrate contamination removal and ammonia producing in mild ambient conditions.Herein,a novel strategy based on interfacial...Electrochemical nitrate reduction reaction(NITRR)has emerged as a promising approach for both nitrate contamination removal and ammonia producing in mild ambient conditions.Herein,a novel strategy based on interfacial engineering is proposed to improve the catalytic performance of MoS_(2)via introducing few-layer V_(2)C MXene heterostructure.This explicitly tailored method effectively addresses the challenge of MoS_(2)aggregation,while simultaneously inducing transformative changes in the native electron orbitals of Mo active sites in MoS_(2).The optimal heterostructure MoS_(2)@V_(2)C catalyst emerges with excellent attributes:nitrate removal rate(93%),ammonia selectivity(84%),and Faradic efficiency(80%)at-0.9 V(vs.reversible hydrogen electrode(RHE))in a low NO_(3)^(-)concentration.The theoretical research demonstrates the energy barrier of ^(*)NO to ^(*)NOH is significantly reduced by 0.92 eV after inducing V_(2)C MXene.Moreover,there is an evident shift in the center of the d-band towards the Fermi level,accompanied by a potent suppression of the hydrogen evolution reaction.展开更多
Environmental pollution from persistent pharmaceuticals like carbamazepine(CBZ)poses severe risks to aquatic ecosystems and human health,yet conventional treatments struggle with low concentrations and secondary pollu...Environmental pollution from persistent pharmaceuticals like carbamazepine(CBZ)poses severe risks to aquatic ecosystems and human health,yet conventional treatments struggle with low concentrations and secondary pollution.Piezo-photocatalysis,which harnesses mechanical and solar energies to drive charge separation,offers a promising alternative using materials such as molybdenum disulfide(MoS_(2)),whose layered structure enables tunable piezoelectricity but is hindered by rapid electron-hole recombination and structural instability.However,the mechanistic role of oxygen doping in repairing sulfur vacancies and enhancing symmetry-breaking for improved performance remains underexplored.Here we show that hydrothermally synthesized oxygen-doped MoS_(2)(O 5-MoS_(2))fully degrades 2 mg L^(-1)CBZ in 25 min under combined ultrasound and visible light,achieving a rate constant(k obs)of 0.13 min^(-1)—11.4 times higher than undoped MoS_(2).This stems from oxygen substitution narrowing the bandgap to 1.94 eV,boosting the piezoelectric coefficient to 63 p.m.V^(-1)(versus 26 p.m.V^(-1)),and generating a 0.19 V built-in potential that drives charge separation,as confirmed by 4.18μA cm^(-2)synergistic photocurrents,density functional theory calculations revealing heightened Mo-O charge transfer(2.08-2.36 e^(-)),and finite element simulations of deformation-induced fields.Over five cycles,O 5-MoS_(2)retains 100%efficiency with minimal Mo leaching(1.9%),reducing product toxicity across fish,daphnid,and algal models.These findings delineate oxygen doping's dual role in defect mitigation and polarization enhancement,paving the way for robust piezo-photocatalytic systems in real-world water purification.展开更多
Wearable pressure sensors have drawn significant attention because of their extensive applications in motion detection, tactile sensing, and health monitoring. However, the complex manufacturing process and high cost ...Wearable pressure sensors have drawn significant attention because of their extensive applications in motion detection, tactile sensing, and health monitoring. However, the complex manufacturing process and high cost of active materials make low-cost,large-scale production elusive. In this work, we report a flexible piezoresistive pressure sensor assembled with two 3D laserinduced graphene(LIG) foam electrodes on a polyimide thin film from a simple laser scribing process in the ambient environment. The design of the air gap between the two foam electrodes allows the sensor to showcase a low limit of detection of 0.274 Pa, which provides favorable sensing performance in motion detection and wrist pulse monitoring. The addition of spherical MoS2 nanoparticles between the two foam electrodes further enhances the sensitivity to 88 k Pa-1 and increases the sensing range to significantly outperform the previous literature reports. The demonstrated LIG pressure sensors also exhibit fast response/recovery rates and excellent durability/repeatability.展开更多
基金the financial support from the Science, Technology, and Innovation Funding Authority (STIFA, STDF previously) through project number 42691 entitled “Microstructure-Based, Multi-Physics Simulation and Optimization to Improve Battery Performance”supported by the U.S. DOE (Department of Energy), Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357supported by the U.S. DOE Vehicle Technologies office, under contract number DE-AC02-06CH11357
文摘This study investigates the electrochemical behavior of molybdenum disulfide(MoS_(2))as an anode in Li-ion batteries,focusing on the extra capacity phenomenon.Employing advanced characterization methods such as in situ and ex situ X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,and transmission electron microscopy,the research unravels the complex structural and chemical evolution of MoS_(2) throughout its cycling.A key discovery is the identification of a unique Li intercalation mechanism in MoS_(2),leading to the formation of reversible Li_(2)MoS_(2) phases that contribute to the extra capacity of the MoS_(2) electrode.Density function theory calculations suggest the potential for overlithiation in MoS_(2),predicting Li5MoS_(2) as the most energetically favorable phase within the lithiation–delithiation process.Additionally,the formation of a Li-rich phase on the surface of Li_(4)MoS_(2) is considered energetically advantageous.After the first discharge,the battery system engages in two main reactions.One involves operation as a Li-sulfur battery within the carbonate electrolyte,and the other is the reversible intercalation and deintercalation of Li in Li_(2)MoS_(2).The latter reaction contributes to the extra capacity of the battery.The incorporation of reduced graphene oxide as a conductive additive in MoS_(2) electrodes notably improves their rate capability and cycling stability.
文摘Polypropylene(PP)has low inherent susceptibility to common industrial lasers,which poses a significant challenge for laser-based marking.To improve the laser sensitivity of PP,molybdenum disulfide grafted with polystyrene(MoS_(2)-g-PS)was synthesized via in-situ free radical polymerization and used as a laser-sensitive filler for PP composites prepared by melt blending.The composites were then marked with a 1064 nm semiconductor laser,producing clear and legible patterns.The marked surfaces were characterized using scanning electron microscopy(SEM),transmission electron microscopy(TEM),colorimetry,Raman spectroscopy,and thermogravimetric analysis(TGA).The results demonstrate that the PP/MoS_(2)-g-PS composites exhibit significantly improved laser markability compared to both pure PP and PP/MoS_(2) composites,yielding superior marking quality.When the MoS_(2)-g-PS content was 0.02 wt%and the laser current intensity was 11 A,a clearly recognizable QR code pattern was obtained with high resolution and legibility.The mechanism of laser-induced marking on the PP/MoS_(2)-g-PS composites involves efficient absorption of near-infrared(NIR)laser energy and photothermal conversion by the MoS_(2) core,while the surrounding PS layer carbonizes upon laser irradiation.The synergistic effect between MoS_(2) and PS effectively enhance the laser marking performance of PP.
基金Supported partially by the State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology,Zhejiang University of TechnologyPriority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education,Science and Technology (2009-0094047)
文摘Molybdenum disulfide nanoflakes were synthesized by a simple hydrothermal process using sodium molybdate and thiourea as reactants at a relatively low temperature. X-ray diffraction(XRD) and transmission elec-tron microscopy(TEM) indicate that the samples have the structure of 2H-MoS2 and the morphology of nanoflakes with the average thickness around 5-10 nm. The results of electrochemical properties indicate that the morphology and size of MoS2 particles have effects on their capacity when they are used as the anode for lithium ion battery. The as-prepared MoS2 samples have high reversible discharge capacity up to 994.6 mA·h·g-1 for the MoS2-1 elec-trode and 930.1 mA·h·g-1 for the MoS2-2 electrode and show excellent cycling performances. The MoS2-1 electrode has a better cycling stability than the MoS2-2 electrode due to their difference in the uniformity of the samples.
基金financial support provided by the National Natural Science Foundation of China(Grant No.U1806225)the National Natural Science Foundation of China(Grant No.51908092)the Joint Funds of the National Natural Science Foundation of China-Guangdong(Grant No.U1801254)。
文摘Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive application.There are limited approaches to exploit such anti-corrosion and mechanical properties of magnesium lithium alloys.Herein,the epoxy resin powder coating with polydopamine modified molybdenum disulfide(MoS_(2)@PDA-EP powder coating with 0,0.1,0.2,0.5,1.0 wt.%loading)was well prepared by melt extrusion to investigate its anticorrosion performance and wear resistance.The results revealed that the addition of MoS_(2)@PDA enhanced the adhesion strength between coatings and alloys,wear resistance and corrosion protection of the powder coatings.Among them,the optimum was obtained by 0.2 wt.%MoS_(2)@PDA-EP powder coating which could be attributed to well dispersion and efficient adhesion with coating matrix.To conclude,MoS_(2)@PDA-EP powder coating is meaningfully beneficial for the anticorrosive and wear performance improvement of magnesium lithium alloys.
基金financially supported by the National Natural Science Foundation of China(Grant No.51572166)the China Postdoctoral Science Foundation(Grant No.2021M702073)+1 种基金the Rare and Precious Metals Material Genetic Engineering Project of Yunnan Province(Grant No.202002AB080001-1)support from the Program for Professors with Special Appointments(Eastern Scholar:TP2014041)at Shanghai Institutions of Higher Learning。
文摘Molybdenum disulfide(MoS_(2))-based materials as the non-noble metal catalysts have displayed the potential capability to drive electrocatalytic hydrogen evolution reaction(HER)for green hydrogen production along with their intrinsic activity,tunable electronic properties,low cost,and abundance reserves,which have attracted intensive attention as alternatives to the low-abundance and high-cost platinum-based catalysts.However,their insufficient catalytic HER activities and stability are the major challenges for them to become practically applicable.Hereby,the MoS_(2)-based electrocatalysts for HER are comprehensively reviewed to explain the fundamental science behind the manipulations of the crystal structure,microstructure,surface,and interface of MoS_(2) in order to enhance its catalytic performance through changing the electrical conductivity,the number of active sites,surface wettability,and the Gibbs free energy for hydrogen adsorption(ΔGH).Recent studies in surface/interface engineering,such as phase engineering,defect engineering,morphology design,and heterostructure construction,are analyzed to reveal the state-of-the-art strategies for designing and preparing the cost-effective and highperformance MoS_(2)-based catalysts through optimizing the charge transfer,surface-active sites,ΔGH,and surface hydrophilicity.Lastly,the perspectives,challenges,and future research directions of HER electrocatalysis are also given to facilitate the further research and development of HER catalysts.
基金financially supported by the National Funds for Distinguished Young Scientists (No. 61825503)the National Natural Science Foundation of China (Nos. 51902101, 61775101,61804082)+3 种基金the Youth Natural Science Foundation of Hunan Province (No. 2019JJ50044)Natural Science Foundation of Jiangsu Province (No. BK20201381)Science Foundation of Nanjing University of Posts and Telecommunications (No. NY219144)China Postdoctoral Science Foundation (Nos. 2020TQ0202, 2021M692161)。
文摘Molybdenum disulfide(MoS_(2)),a typical two-dimensional transition metallic layered material,attracts tremendous attentions in the electrochemical energy storage due to its excellent physicochemical properties.However,with the deepening of the research and exploration of the lithium storage mechanism of these advanced MoS_(2)-based anode materials,the complex reaction process influenced by internal and external factors hinders the exhaustive understanding of the lithium storage process.To design stable anode material with high performance,it is urgent to review the mechanisms of reported anode materials and summarize the related factors that influence the reaction processes.This review aims to dissect all possible side reactions during charging and discharging process,uncover internal and external factors inducing various anode reactions and finally put forward strategies of controlling high cycling capacity and super-stable lithium storage capability of MoS_(2).This review will be helpful to the design of MoS_(2)-based lithium-ion batteries(LIBs) with excellent cycle performance to enlarge the application fields of these advanced electrochemical energy storage devices.
基金financial support for this work from the Strategic Priority Research Program of CAS(XDB36030000)the National Natural Science Foundation of China(21422303,21573049,21872043,22002028)+3 种基金the National Basic Research Plan of China(2016YFA0201600)the Beijing Natural Science Foundation(2142036)the Youth Innovation Promotion Associationthe Special Program of “One Belt One Road”of CAS。
文摘The hierarchical structure of molybdenum disulfide(MoS2)nanosheet arrays stemmed from nickelcobalt layered double hydroxide(NiCo-LDH)/carbon cloth was prepared by growing the MoS_(2) nanosheet arrays onto the NiCo-LDH template which was pre-deposited onto the carbon cloth substrate.In this electrode configuration,carbon cloth is the three dimensional and conductive skeleton;NiCo-LDH nanosheets,as the template,ensure the oriented growth of MoS2 nanosheet arrays.Therefore,more MoS_(2) active sites are exposed and the catalyst exhibits good hydrogen evolution reaction activity.
基金This work was financially supported by the National Natu-ral Science Foundation of China(Nos.22278378,22208190,and 21706120)the Natural Science Foundation of Jiangsu Province(No.BK20211592)+2 种基金the National Postdoctoral Program for Innovative Tal-ents(No.BX2021146)the Shuimu Tsinghua Scholar Program(No.2021SM055)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘Ti_(3)C_(2)T_(x)MXene fiber has shown extraordinary potential for supercapacitor electrode in wearable elec-tronics and textile energy storage,but realizing high energy density and practical-powered applications remains a great challenge.Here,we report a covalent-architected molybdenum disulfide-Ti_(3)C_(2)T_(x)(MoS_(2)-Ti_(3)C_(2)T_(x))core-shell fiber for high-performance supercapacitor.Benefiting from the microfluidic and micro-reaction strategies,the ordered MoS_(2)arrays are strongly bridged on Ti_(3)C_(2)T_(x)fiber via Ti-O-Mo bond,re-sulting in large exposed surface,enhanced porosity and excellent interfacial conduction for charges high diffusion and faradaic transfer.The MoS_(2)-Ti_(3)C_(2)T_(x)fiber exhibits ultra-large capacitance of 2028 F cm^(-3)and admirable reversibility in 1 M H_(2)SO_(4)aqueous electrolyte.Meanwhile,MoS_(2)-Ti_(3)C_(2)T_(x)fiber-based solid-state supercapacitor presents high energy density of 23.86 mWh cm^(-3),capacitance of 1073.6 F cm^(-3)and superior cycling ability of 92.13%retention after 20,000 cycles,which can realize stable energy supply for wearable watch,LEDs,electric fans,toy ship and self-powered devices.Our work may provide an insight-ful guidance for the advanced design of structural fiber towards robust new energy and next-generation wearable industry.
基金supported by the National Key Research and Development Program of China (2016YFFA0200400)the Natural Science Foundation of China (51571100, 51872116, and 51602305)+3 种基金the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09)the Fundamental Research Funds for the Central Universitiessupport from the Australian Research Council (ARC, FT150100450 and IH150100006)the ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET, CE170100039)
文摘Two-dimensional materials(2DMs) have attracted substantial attention due to their abundant active sites and their ultrahigh surface area for different catalytic applications due to the high lateral-longitudinal ratio. Transition metal dichalcogenides(TMDs), especially MoS2, as one of the 2DMs most often studied, have shown superior activity in electrochemical applications. Recently, combinations of different 2DMs have been widely studied, and they appear to be the most promising strategy available to develop state of the art catalysts for different reactions.In this article, we review the interactions between MoS2 and other materials as well as the novel assembly induced phase transitions of TMDs and their underlying mechanisms. Several methods for inducing the phase transition of TMDs by building MoS2-based heterostructures have been introduced. The electronic coupling between these counterparts has significantly enhanced their conductivity and optimized the energy states of the materials, thus introducing enhanced activity as compared to their original counterparts. The ideas summarized in this article may shed new light on and help to develop next-generation green energy materials by designing and constructing highly active two-dimensional catalysts for efficient water splitting.
基金supported by the National Basic Research Program of China(No.2015CB654703)。
文摘A series of non-covalently functionalized molybdenum disulfide-silica(f-MoS_(2)-SiO_(2))nanocomposites was prepared by an in-situ assembled method and used to fabricate the oriented molybdenum disulfide-SiO_(2)/Hydrogenated Nitrile Butadiene Rubber(f-MoS2-SiO_(2)/HNBR)composites.The characterization results show the synergistic dispersion between the functionalized molybdenum disulfide(f-MoS2)nanosheets and SiO_(2)nanoparticles.The addition of f-MoS2 nanosheets can improve the dispersion of fillers in the rubber matrix and weaken the filler network.The non-covalently functionalization improves the interface interaction between f-MoS_(2)nanosheets and the rubber matrix.Furthermore,the tensile strength of f-MoS2-SiO_(2)/HNBR is 65.9%higher than that of SiO_(2)/HNBR by adding 1.0wt%of f-MoS_(2).At the same time,the dielectric constant of f-MoS2-SiO_(2)/HNBR is increased by 23.7%compared to SiO_(2)/HNBR due to the micro-capacitor structure of parallel f-MoS2 nanosheets in the rubber matrix.Our work provides new ideas for the development of high-performance elastomer materials.
基金the financial support from the National Key Research and Development Program of China(No.2017YFE0107200)Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX20_1105)+2 种基金NSFC(No.21876145)the Supporting Plan for 100 Excellent Innovative Talents in Colleges and Universities of Hebei Province(No.SLRC2019041)Open Foundation of State Key Laboratory of Pollution Control and Resource Reuse(No.PCRRF18026,Nanjing University)。
文摘Molybdenum disulfide(MoS_(2))has excellent trapping ability for lead ions whereas its micro-/nanoscale size has greatly impeded its practical applications in the flow-through systems.Herein,a millimetersized nanocomposite MoS_(2)-001 was synthesized for Pb^(2+)removal by loading MoS_(2) nanosheets into a polystyrene cation exchanger D-001 by a facile hydrothermal method.The proposed structure and adsorption mechanism of MoS_(2)-001 was confirmed by the scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and X-ray photoelectron spectro scopy(XPS)analysis.The nanocomposite showed outstanding adsorption capacity and rapid adsorption kinetic for Pb^(2+)removal,and the adsorption behavior followed the Langmuir adsorption model and pseudo-firstmodel kinetic model.Pb^(2+)uptake by MoS_(2)-001 still maintains a high level even in the presence of extremely highly competitive ions(Ca(Ⅱ)and Mg(Ⅱ)),suggesting its high selectivity for Pb^(2+)adsorption.Besides,the fixed-bed column experiments further certified that MoS_(2)-001 is of great potential for Pb^(2+)removal from the wastewater in practical engineering applications.Even more gratifying is that the exhausted MoS_(2)-001 can be regenerated by NaCl-EDTANa_(2) solution without any significant adsorption capacity loss.Consequently,all the results indicated that MoS_(2)-001 is a promising candidate adsorbent for lead-containing wastewater treatment.
基金financially supported by the National Natural Science Foundation of China (No. 51673159)the Youth Science and Technology Innovation Team of Sichuan Province of Functional Polymer Composites (No. 2021JDTD0009)supported by the Analytical and Testing Center of Southwest Jiaotong University
文摘High-performance dielectric polymer composites have received increasing attention due to their important applications in the field of energy storage.The rational structural design of hybrid fillers can lead to a balance between high dielectric constant and insulation in composites.In this work,novel hybrid fillers were fabricated by in situ synthesizing one-dimensional polypyrrole nanowires(PPynws)on the twodimensional molybdenum disulfide(MoS_(2)),which integrated the good ion polarization ability of PPynws and the high insulation and adjustable band gap of MoS_(2).Compared with the binary poly(vinylidene fluoride)(PVDF)/MoS_(2) composites,the PVDF/MoS_(2)-PPynws composites exhibited remarkably improved dielectric constant and breakdown strength,while the dielectric loss was still maintained at a low level.An optimal ternary composite with 1 wt%MoS_(2)-PPynws showed a high dielectric constant(15@1kHz),suppressed dielectric loss(0.027@1kHz),and high breakdown strength(422.1 MV/m).PPynws inducing strong interfacial polarization and the highly insulated MoS_(2) nanosheets extending the breakdown path mainly contributed to the synchronously enhanced dielectric constant and breakdown strength.This intriguing synthesis method of PVDF/MoS_(2)-PPynws nanocomposite will open up new opportunities for fabricating nanostructured polymer composites to produce high dielectric materials.
基金supported by the National Natural Science Foundation of China(No.61805134 and No.11974229)Applied Basic Research Program in Shanxi Province,China(No.201801D221016 and No.202103021223254)+2 种基金Scientific and Technological Innovation Pro-grams of Higher Education Institutions in Shanxi(No.2020L0235 and No.2021L257)Linfen Key Re-search and Development Program(No.2028)Graduate Innovation Project in Shanxi Province(No.2022Y498).
文摘Zero-dimensional environmentally friendly carbon quantum dots(CQDs)combined with two-di-mensional materials have a wide range of applications in optoelec-tronic devices.We combined steady-state and transient absorp-tion spectroscopies to study the energy transfer dynamics between CQDs and molybdenum disulfide(MoS_(2)).Transient absorption plots showed photoinduced absorption and stimulated emission features,which involved the intrinsic and defect states of CQDs.Adding MoS_(2)to CQDs solution,the lowest unoccupied molecular orbital of CQDs transferred energy to MoS_(2),which quenched the intrinsic emission at 390 nm.With addition of MoS_(2),CQD-MoS_(2)composites quenched defect emission at 490 nm and upward absorption,which originated from another energy transfer from the defect state.Two energy transfer paths between CQDs and MoS_(2)were efficiently manipulated by changing the concentration of MoS_(2),which laid a foundation for improving device performance.
基金Project supported by the National Natural Science Foundation of China(Grant No.11604192)the Fundamental Research Program of Shanxi Province,China(Grant No.202103021224250)+1 种基金the Science and Technology Innovation Project of Colleges and Universities of Shanxi Province of China(Grant No.2020L0242)the Start-up funding from Shanxi Normal University(Grant No.0505/02070351)
文摘The acoustic-phonon emission from monolayer molybdenum disulfide(ML-MoS_(2))driven by a direct-current electric field is studied theoretically using the Boltzmann equation method.It is found that the Cerenkov emission of terahertz acoustic-phonons can be generated when a very weak electric field is applied to ML-MoS_(2).The physical mechanisms of acoustic-phonon emission are analyzed from the perspective of condensed matter physics.The acoustic-phonon emission from ML-MoS_(2)is also compared with those from graphene and GaAs.The results reveal that the frequencies of acousticphonons generated by ML-MoS_(2)are between the frequencies of those generated from GaAs and graphene.The results of this work suggest that the ML-MoS_(2)can make up for graphene and GaAs in respect of acoustic-phonon emission and be used in tunable hypersonic devices such as terahertz sound sources.
文摘The properties of a metal-oxide-semiconductor device on a single layer MoS_(2)(molybdenum disulfide)semiconductor are determined theoretically utilizing the concept of physics that the carrier effective masses in materials are related to the intrinsic Fermi energy levels in materials by the universal mass-energy equivalence equation given as dE/E=dm/m,where E is the energy and m is the mass of the free electron.The known parameters of electron effective mass of 0.48 m and the direct bandgap of 1.8 eV for monolayer MoS_(2) semiconductor are utilized to determine the properties of the MOS(metal-oxide-semiconductor)device,with the given previous research consequence that the threshold for electron heating in SiO_(2) is 2 MV/cm-eV.
基金supported by the National Key Research and Development Program of China(No.2022YFB3806903)the National Natural Science Foundation of China(Nos.52303096 and 52473076)+3 种基金Sichuan Science and Technology Program(No.2024NSFSC1024)supported by the State Key Laboratory of Polymer Materials Engineering(No.sklpme2024-2-01)Sichuan University Interdisciplinary Innovation Fund,Sichuan University Young teachers scientific and technological innovation ability lifting project(No.2024SCUQJTX023)the Fundamental Research Funds for the Central Universities(No.YJ202253).
文摘Molybdenum disulfide(MoS_(2))has been widely employed in microelectronic devices,photoelectric detections,and lubricants.However,the poor oxidation resistance and interfacial bonding ability restrict its high-performance applications.In this work,a largely unexplored strategy by direct gas fluorination reaction is applied to rapidly fabricate high-quality fluorinated MoS_(2)(FMoS_(2)).It has been demonstrated that the controllable fluorination is guided to solely eliminate unstable oxygen groups at the edge of MoS_(2)nanosheet rather than damage intact plane structure,which thus maintains pristine crystal structure and specifically introduces stable fluorine-containing groups at the edge,significantly strengthening the oxidation resistance ability.Meanwhile,the introduced fluorine with strongest electronegativity and fluorination-induced more S-vacancies can produce strong interactions with metal atoms,thereby synergistically strengthening interfacial bonding with metal substrate.As a typical application verification,FMoS_(2)exhibits obviously enhanced lubricating performances than that of pristine MoS_(2)because of enhanced oxidation resistance and interfacial bonding ability,accompanied by 50.2%and 74%decrease in friction coefficient and wear rate,respectively.This work offers a direct,rapid and controllable fluorination strategy to solve the long-standing challenges in significant MoS_(2)application fields,which also presents the universal potential to optimize other important two-dimensional(2D)materials toward high-performance applications at harsh environments.
基金funded by the Natural Science Fund for Colleges and Universities in Jiangsu Province(21KJB220015)the Taicang Technology Project(TC2021JC11)+1 种基金the Innovation Team Funds of the Suzhou Chien-shiung Institute of Technology(2023JXKYTD01)the Visiting Scholar Project for Higher Vocational Colleges in Jiangsu Province(2024GRFX045)。
文摘With the development of nanotechnology,“nanozymes”,a kind of nanomaterials with high enzyme-like activity,have attracted much attention because of their exciting and extensive applications.As an emerging layered nanomaterial,molybdenum disulfide(MoS_(2)),which has unique chemical and physical properties,has been used to construct nanozymes with diff erent compositions,structures,and morphologies.Moreover,MoS_(2)-based nanozymes have been widely applied in sensing,catalysis,and disease diagnosis.Herein,the applications of MoS_(2)-based nanozymes in the sensing field are summarized.First,the preparation of MoS_(2)-based nanozymes,including noble metal nanoparticle-,carbon-based material-,and organic molecule-hybridized nanozymes,is introduced.The recent advances in MoS_(2)-based nanozymes used in sensing applications,including environmental monitoring,biochemical analysis,and disease diagnosis,are systematically discussed.Finally,the challenges and opportunities for MoS_(2)-based nanozymes in the future are also discussed.
基金supported by the National Natural Science Foundation of China(No.22002083)Natural Science Foundation of Shanxi Province(No.202403021221035).
文摘Electrochemical nitrate reduction reaction(NITRR)has emerged as a promising approach for both nitrate contamination removal and ammonia producing in mild ambient conditions.Herein,a novel strategy based on interfacial engineering is proposed to improve the catalytic performance of MoS_(2)via introducing few-layer V_(2)C MXene heterostructure.This explicitly tailored method effectively addresses the challenge of MoS_(2)aggregation,while simultaneously inducing transformative changes in the native electron orbitals of Mo active sites in MoS_(2).The optimal heterostructure MoS_(2)@V_(2)C catalyst emerges with excellent attributes:nitrate removal rate(93%),ammonia selectivity(84%),and Faradic efficiency(80%)at-0.9 V(vs.reversible hydrogen electrode(RHE))in a low NO_(3)^(-)concentration.The theoretical research demonstrates the energy barrier of ^(*)NO to ^(*)NOH is significantly reduced by 0.92 eV after inducing V_(2)C MXene.Moreover,there is an evident shift in the center of the d-band towards the Fermi level,accompanied by a potent suppression of the hydrogen evolution reaction.
基金supported by the National Natural Science Foundation of China(Grant No.52270055)the Fundamental Research Funds for the Central Universities(Grant No.BUCTRC202209).
文摘Environmental pollution from persistent pharmaceuticals like carbamazepine(CBZ)poses severe risks to aquatic ecosystems and human health,yet conventional treatments struggle with low concentrations and secondary pollution.Piezo-photocatalysis,which harnesses mechanical and solar energies to drive charge separation,offers a promising alternative using materials such as molybdenum disulfide(MoS_(2)),whose layered structure enables tunable piezoelectricity but is hindered by rapid electron-hole recombination and structural instability.However,the mechanistic role of oxygen doping in repairing sulfur vacancies and enhancing symmetry-breaking for improved performance remains underexplored.Here we show that hydrothermally synthesized oxygen-doped MoS_(2)(O 5-MoS_(2))fully degrades 2 mg L^(-1)CBZ in 25 min under combined ultrasound and visible light,achieving a rate constant(k obs)of 0.13 min^(-1)—11.4 times higher than undoped MoS_(2).This stems from oxygen substitution narrowing the bandgap to 1.94 eV,boosting the piezoelectric coefficient to 63 p.m.V^(-1)(versus 26 p.m.V^(-1)),and generating a 0.19 V built-in potential that drives charge separation,as confirmed by 4.18μA cm^(-2)synergistic photocurrents,density functional theory calculations revealing heightened Mo-O charge transfer(2.08-2.36 e^(-)),and finite element simulations of deformation-induced fields.Over five cycles,O 5-MoS_(2)retains 100%efficiency with minimal Mo leaching(1.9%),reducing product toxicity across fish,daphnid,and algal models.These findings delineate oxygen doping's dual role in defect mitigation and polarization enhancement,paving the way for robust piezo-photocatalytic systems in real-world water purification.
基金support from the Joint Doctoral Training Foundation of HEBUTsupports from the National Natural Science Foundation of China(Grant No.ECCS-1933072)+1 种基金the National Heart,Lung,and Blood Institute of the National Institutes of Health(Grant No.R61HL154215)the Penn State University(Center for Security Research and Education,Center for Biodevices,and College of Engineering Multidisciplinary Seed Grants)。
文摘Wearable pressure sensors have drawn significant attention because of their extensive applications in motion detection, tactile sensing, and health monitoring. However, the complex manufacturing process and high cost of active materials make low-cost,large-scale production elusive. In this work, we report a flexible piezoresistive pressure sensor assembled with two 3D laserinduced graphene(LIG) foam electrodes on a polyimide thin film from a simple laser scribing process in the ambient environment. The design of the air gap between the two foam electrodes allows the sensor to showcase a low limit of detection of 0.274 Pa, which provides favorable sensing performance in motion detection and wrist pulse monitoring. The addition of spherical MoS2 nanoparticles between the two foam electrodes further enhances the sensitivity to 88 k Pa-1 and increases the sensing range to significantly outperform the previous literature reports. The demonstrated LIG pressure sensors also exhibit fast response/recovery rates and excellent durability/repeatability.
