Self-supported high-entropy alloy electrocatalyst for highly efficient H_(2) evolution in acid condition

查看全文 作　　者：Peiyan [1]Ma;Mingming [1]Zhao;Long [1]Zhang;Heng [3]Wang;Junfeng [2]Gu;Yuchen [2]Sun;Wei [2]Ji;Zhengyi [2]Fu

机构地区：[1]School of Chemistry,Chemical Engineering and Life science,Wuhan University of Technology,Wuhan City,Hubei Province,PR China;[2]State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan City,Hubei Province,PR China;[3]Engineering Research Center of Environmental Materials and Membrane Technology,School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan City,Hubei Province,PR China

出　　处：《Journal of Materiomics》索引2020年第6卷第4期,共7页

基　　金：National Natural Science Foundation of China(51521001,51832003);Fundamental Research Funds for the Central Universities(WUT:2019IB002);National College Students Innovation and Entrepreneurship Training Program(2019-C-B1-25). 摘　　要：Developing non-precious catalysts as Pt substitutes for electrochemical hydrogen evolution reaction(HER)with superior stability in acidic electrolyte is of critical importance for large-scale,low-cost hydrogen production from water.Herein,we report a CoCrFeNiAl high-entropy alloy(HEA)electrocatalyst with self-supported structure synthesized by mechanical alloying and spark plasma sintering(SPS)consolidation.The HEA after HF treatment and in situ electrochemical activation for 4000 cycles of cyclic voltammetry(HF-HEAa2)presents favourable activity with overpotential of 73 mV to reach a current density of 10 mA cm^(2) and a Tafel slope of 39.7 mV dec1.The alloy effect of Al/Cr with Co/Fe/Ni at atomic level,high-temperature crystallization,as well as consolidation by SPS endow CoCrFeNiAl HEA with high stability in 0.5 M H2SO4 solution.The superior performance of HF-HEAa2 is related with the presence of metal hydroxides/oxides groups on HEA. 关键词：loy Hydrogen evolution reaction ELECTROCATALYSTS Acidic electrolyte Stability

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Self-supported high-entropy alloy electrocatalyst for highly efficient H_(2) evolution in acid condition

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