Water splitting is regarded as among the most prospective methods of generating green hydrogen.Switching electrolytes of water electrolysis from acidic to non-acidic ones will enable the use of noble-metal-free electr...Water splitting is regarded as among the most prospective methods of generating green hydrogen.Switching electrolytes of water electrolysis from acidic to non-acidic ones will enable the use of noble-metal-free electrocatalysts and mitigate material corrosion,thus lowering the capital cost of water electrolyzers and improving their operational stability.However,increasing electrolyte pH will degrade the hydrogen evolution reaction(HER)activity because of the reduced concentration of H_(3)O^(+)as reactants,making non-acidic HER sluggish.To accelerate HER,MoS_(2)-based materials with the advantages of unique atomistic structure,low cost,and high abundance have been considered prospective electrocatalysts to substitute for Pt in acid.Great efforts are being spent on extending MoS_(2)-based materials into the catalysis of non-acidic HER,and their further development requires clarification of the existing challenges and current progress.However,it has not yet been discussed for non-acidic HER on MoS_(2)-based electrocatalysts.To mitigate the disparity,we systematically overview MoS_(2)-based electrocatalysts for non-acidic HER,covering catalytic mechanisms,modulation strategies,materials development,current challenges,research progress,and perspectives.This review will contribute to the rational design of MoS_(2)-based materials for high-performance HER in non-acidic conditions.展开更多
Tungsten disulfide(WS_(2))has been considered as a promising hydrogen evolution reaction(HER)candidate due to its high activity,robust chemical stability,and earth-abundant resources.However,the inert basal planes and...Tungsten disulfide(WS_(2))has been considered as a promising hydrogen evolution reaction(HER)candidate due to its high activity,robust chemical stability,and earth-abundant resources.However,the inert basal planes and low electrical conduc-tivity greatly hinder its development in HER.Increasingly,the density of active sites through the structural designing is one of the most effective strategies to enhance the HER performance.Herein,we report a facile one-step hydrothermal method for synthesizing flower-like WS_(2)nanosheets for highly efficient HER.Besides,the effect of preparation temperature is also been discussed.The optimized WS_(2)nanosheets exhibit the enhanced HER activity in strong acidic solutions with a low Tafel slope and a good stability.The improvement of the HER performance can be attributed to sheet-like nanostructures,which greatly increase the edge sites and defects,resulting in a high density of exposed active sites.Besides,these sheet-like nano-structures also can make the acidic electrolyte easily accessible to the surface of WS_(2)and accelerate the electron transfer rate.展开更多
基金the City University of Hong Kong through Projects 9610537 and 7005921the Department of Science and Technology of Guangdong Province through Project 2022A1515010212Guangdong Provincial Key Laboratory of Materials and Technology for Energy Conversion,and Guangdong Technion-Israel Institute of Technology through Project MATEC2022KF008.
文摘Water splitting is regarded as among the most prospective methods of generating green hydrogen.Switching electrolytes of water electrolysis from acidic to non-acidic ones will enable the use of noble-metal-free electrocatalysts and mitigate material corrosion,thus lowering the capital cost of water electrolyzers and improving their operational stability.However,increasing electrolyte pH will degrade the hydrogen evolution reaction(HER)activity because of the reduced concentration of H_(3)O^(+)as reactants,making non-acidic HER sluggish.To accelerate HER,MoS_(2)-based materials with the advantages of unique atomistic structure,low cost,and high abundance have been considered prospective electrocatalysts to substitute for Pt in acid.Great efforts are being spent on extending MoS_(2)-based materials into the catalysis of non-acidic HER,and their further development requires clarification of the existing challenges and current progress.However,it has not yet been discussed for non-acidic HER on MoS_(2)-based electrocatalysts.To mitigate the disparity,we systematically overview MoS_(2)-based electrocatalysts for non-acidic HER,covering catalytic mechanisms,modulation strategies,materials development,current challenges,research progress,and perspectives.This review will contribute to the rational design of MoS_(2)-based materials for high-performance HER in non-acidic conditions.
基金the National Natural Science Foundation of China(Grant 51572301)National Key R&D Program of China(2017YFB0306001 and 2018YFC1901702)+1 种基金Hunan Provincial Natural Science Foundation(Grant 2016JJ3153)the Innovation-Driven Project of Central South University(Grant 502221802)are gratefully acknowledged.
文摘Tungsten disulfide(WS_(2))has been considered as a promising hydrogen evolution reaction(HER)candidate due to its high activity,robust chemical stability,and earth-abundant resources.However,the inert basal planes and low electrical conduc-tivity greatly hinder its development in HER.Increasingly,the density of active sites through the structural designing is one of the most effective strategies to enhance the HER performance.Herein,we report a facile one-step hydrothermal method for synthesizing flower-like WS_(2)nanosheets for highly efficient HER.Besides,the effect of preparation temperature is also been discussed.The optimized WS_(2)nanosheets exhibit the enhanced HER activity in strong acidic solutions with a low Tafel slope and a good stability.The improvement of the HER performance can be attributed to sheet-like nanostructures,which greatly increase the edge sites and defects,resulting in a high density of exposed active sites.Besides,these sheet-like nano-structures also can make the acidic electrolyte easily accessible to the surface of WS_(2)and accelerate the electron transfer rate.
