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molybdenum disulfide(MoS2)-based electrocatalysts for hydrogen evolution reaction:From mechanism to manipulation

Journal of Energy Chemistry 2022年第11期31卷 45-71,I0003页

作者： Yao Xu Riyue Ge Jack Yang Jiancheng Li Sean Li Ying Li Jiujun Zhang Jing Feng Bin Liu Wenxian Li Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China School of Materials Science and Engineering University of New South WalesSydney NSw 2052Australia Materials and Manufacturing Futures Institute University of NewSouthWalesSydney NSW2052Australia School of Materials Science and Engineering Shanghai UniversityShanghai 200444China InstituteforSustainable Energy Shanghai UniversityShanghai 200444China Collge of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina

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.

关键词： Surface/interface engineering Hydrogen evolution reaction molybdenum disulfide Mechanisms

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molybdenum disulfide@nickel phyllosilicate hybrid for improving the flame retardancy and wear resistance of epoxy composites

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2114-2126页

作者： Shibin Nie Wei He Yuxuan Xu Wenli Zhai Hong Zhang Jinian Yang School of Public Security and Emergency Management Anhui University of Science and TechnologyHefei 231131China Institute of Energy Hefei Comprehensive National Science Center(Anhui Energy Laboratory)Hefei 230000China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China

In this study,nickel phyllosilicate was synthesized based on molybdenum disulfide(MoS2@NiPS)by the sol-gel method,and then MoS2@NiPS was used to prepare epoxy composites.The thermal stability,flame retardancy,and frictional performances of epoxy composites were studied.With the addition of 3 wt%MoS2@NiPS,the epoxy composite increased the limiting oxygen index from 23.8%to 26.1%and reduced the vertical burning time from 166 s for epoxy resin to 35 s.The residual char of the epoxy composite increased from 11.8 to 20.2 wt%.MoS2@NiPS promoted the graphitization of the residual char,and facilitated the formation of a dense and continuous char layer,thereby improving the fire safety of epoxy resin.The epoxy composite with 3 wt%MoS2@NiPS had excellent wear resistance property with a wear rate of 2.19×10^(‒5) mm^(3)·N^(-1)·m^(-1),which was 68.8%lower than that of epoxy resin.This study presented a practical approach to improve the frictional and fire resistance of epoxy composites.

关键词： molybdenum disulfide nickel phyllosilicate epoxy resin flame retardancy

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Energy Transfer Dynamics between Carbon Quantum Dots and molybdenum disulfide Revealed by Transient Absorption Spectroscopy

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化学物理学报(英文) 2023年第5期36卷 503-508,I0001页

作者： Ruixiang Wu Xin Liu Xiaoshuai Wang Jingjing Luo Bin Li Shengzhi Wang Xiangyang Miao Key Laboratory of Spectral Measurement and Analysis of Shanxi Province College of Physics and Information EngineeringShanxi Normal UniversityTaiyuan 030031China

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.

关键词： Energy transfer Transient absorption spectroscopy Carbon quantum dot molybdenum disulfide

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Oriented molybdenum disulfide-silica/hydrogenated nitrile butadiene rubber composites:Effects of nanosheets on mechanical and dielectric properties

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Chinese Journal of Aeronautics 2023年第1期36卷 413-422页

作者： Yanan WANG Junying SUO Dongye WANG Li WEI Pingan HOU Jianfeng PAN Hong ZHU AVIC Chengdu Aircraft Industrial(Group)Co. LtdChengdu 610073China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

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.

关键词： Manufacture molybdenum disulfide Nanocomposites Orientation Reinforcement

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Covalent-architected molybdenum disulfide arrays on Ti_(3)C_(2)T_(x) MXene fiber towards robust capacitive energy storage

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Journal of Materials Science & Technology 2023年第8期139卷 23-30页

作者： Suya Sun Xiaolin Zhu Xingjiang Wu Meigui Xu Ying Hu Ningzhong Bao Guan Wu State Key Laboratory of Materials Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Lab for Textile Fiber Materials&Processing Technology School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Industry and Equipment Technology Hefei University of TechnologyHefei 230009China

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.

关键词： molybdenum disulfide Ti_(3)C_(2)T_(x)fiber Covalent-architecture Supercapacitors High energy density

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A novel negative quantum capacitance field-effect transistor with molybdenum disulfide integrated gate stack and steep subthreshold swing for ultra-low power applications

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Science China(Information Sciences) 2023年第6期66卷 71-77页

作者： Liang CHEN Huimin WANG Qianqian HUANG Ru HUANG School of Integrated Circuits Peking University Beijing Advanced Innovation Center for Integrated Circuits

Various steep-slope devices based on novel structures and mechanisms garnered considerable attention for their potential in ultra-low power logic applications. In this work, a novel steep-slope negative quantum capacitance field-effect transistor(NQCFET)with molybdenum disulfide(MoS2)-integrated gate stack was realized by theoretical analysis and experimental evaluation. By combining the MoS+2 equivalent capacitance model calibrated with experimental results, the NQCFET device model is further established.The results demonstrated that the optimized MoS2-integrated NQCFET can achieve a subthreshold swing(SS)of sub-60 mV/dec over a current range of 5 decades, with the minimum SS reaching 29 mV/dec,indicating the remarkable potential of MoS2-integrated NQCFETs for ultra-low power applications.

关键词： negative quantum capacitance molybdenum disulfide field-effect transistor subthreshold swing ultra-low power device

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Simultaneously Improved Dielectric Constant and Breakdown Strength of PVDF-based Composites with Polypyrrole Nanowire Encapsuled molybdenum disulfide Nanosheets

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Chinese Journal of Polymer Science 2022年第5期40卷 515-525页

作者： Hua-Bin Luo Xiao-Ren Pan Jing-Hui Yang Xiao-Dong Qi Yong Wang School of Materials Science&Engineering Key Laboratory of Advanced Technology of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu 610031China

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.

关键词： Hybrid fillers molybdenum disulfide Polypyrrole nanowires Dielectric composites Breakdown strength

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Developing polydopamine modified molybdenum disulfide/epoxy resin powder coatings with enhanced anticorrosion performance and wear resistance on magnesium lithium alloys

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Journal of Magnesium and Alloys 2022年第9期10卷 2534-2545页

作者： Shibo Chen Changqing Yin Yi Wang Shuang Yi Xiang Gao Xujuan Zhang Qiyu Liao Yuxin Zhang Xia Zhao Jinsong Rao Baorong Hou School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China College of Material Science and Engineering Chongqing UniversityChongqing 400044China Pilot National Laboratory for Marine Science and Technology Open Studio for Marine Corrosion and ProtectionQingdao 266237China Weifang East Steel Pipe Co.LTD. Weifang 261055China College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China China Academy of Space Technology(Xi’an) Xi’an 710100China State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China

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.

关键词： Magnesium lithium alloys Epoxy resin powder coating molybdenum disulfide Polydopamine Anticorrosion performance Wear resistance

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Superlubricity of molybdenum disulfide subjected to large compressive strains

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Friction 2022年第2期10卷 209-216页

作者： Shengcong WU Zhisen MENG Xiaoma TAO Zhao WANG Guangxi Key Laboratory for Relativistic Astrophysics Department of PhysicsGuangxi UniversityNanning 530004.China

The friction between a molybdenum disulphide(MoS2)nanoflake and a MoS2 substrate was analyzed using a modified Tomlinson model based on atomistic force fields.The calculations performed in the study suggest that large deformations in the substrate can induce a dramatic decrease in the friction between the nanoflake and the substrate to produce the so-called superlubricity.The coefficient of friction decreases by 1–4 orders of magnitude when a high strain exceeding 0.1 is applied.This friction reduction is strongly anisotropic.For example,the reduction is most pronounced in the compressive regime when the nanoflake slides along the zigzag crystalline direction of the substrate.In other sliding directions,the coefficient of friction will reduce to its lowest value either when a high tensile strain is applied along the zigzag direction or when a high compressive strain is applied along the armchair direction.This anisotropy is correlated with the atomic configurations of MoS_(2).

关键词： superlubricity friction molybdenum disulfide strain

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Active MoS_(2)-based electrode for green ammonia synthesis

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Chinese Journal of Chemical Engineering 2024年第1期65卷 268-275页

作者： Xin Liu Lei Yang Tao Wei Shanping Liu Beibei Xiao School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Institute Charles Gerhardt Montpellier UMR-5253Universite de MontpellierCNRSENSCMPlace E.Bataillon34095 Montpellier Cedex 05France

Nitrogen electro-reduction under mild conditions is one promising alternative approach of the energyconsuming Haber-Bosch process for the artificial ammonia synthesis.One critical aspect to unlocking this technology is to discover the catalysts with high selectivity and efficiency.In this work,the N_(2)-to-NH_(3)conversion on the functional MoS_(2)is fully investigated by density functional theory calculations since the layered MoS_(2)provides the ideal platform for the elaborating copies of the nitrogenase found in nature,wherein the functionalization is achieved via basal-adsorption,basal-substitution or edge-substitution of transition metal elements.Our results reveal that the edge-functionalization is a feasible strategy for the activity promotion;however,the basal-adsorption and basal-substitution separately suffer from the electrochemical instability and the NRR inefficiency.Specifically,MoS_(2)functionalized via edge W-substitution exhibits an exceptional activity.The energetically favored reaction pathway is through the distal pathway and a limiting potential is less than 0.20 V.Overall,this work escalates the rational design of the high-effective catalysts for nitrogen fixation and provides the explanation why the predicated catalyst have a good performance,paving the guidance for the experiments.

关键词： Nitrogen reduction reaction Density functional theory calculations molybdenum disulfide Electrochemistry Catalyst Thermodynamics

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