Preparation of Nanoscale(VNbTaZrHf)C High-Entropy Carbides via Molten Salt Electro-deoxidation and Its Catalytic Performance of Hydrogen Evolution Reaction
The nanoscale(VNbTaZrHf)C high-entropy carbide(HEC)powders with face-centered cubic structure were prepared by electro-deoxidation of metal oxides and graphite in CaCl2 at 1173 K.Appropriate temperature conditions are favorable for suppressing the in-situ sintering growth of HEC particles.Electrochemical performance tests were conducted in 1 mol/L KOH solution to investigate the catalytic performance of(VNbTaZrHf)C HEC.The catalytic performance of(VNbTaZrHf)C HEC for hydrogen evolution reaction(HER)was evaluated through polarization curves,Tafel slope,electrochemical impedance spectroscopy,and double-layer capacitance value cyclic voltammetry tests.Results show that the double-layer capacitance value of(VZrHfNbTa)C HEC is 40.6 mF/cm2.The larger the double-layer capacitance value,the larger the electrochemically active surface area.Due to the high-entropy effect and nanoscale structure of(VNbTaZrHf)C HEC,it exhibits superior catalytic performance to HER.This research provides a novel method for the preparation of HECs via molten salt electro-deoxidation.
high-entropy carbidemolten salt electro-deoxidationcatalytic performance
杨宇、陈庚、李慧、梁精龙、扈玫珑、胡蒙均
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华北理工大学综合测试分析中心,河北唐山 063009
华北理工大学冶金与能源学院,河北唐山 063210
重庆大学材料科学与工程学院,重庆 400044
重庆工业职业技术学院机械工程学院材料成型及模具技术重点实验室,重庆 401120
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高熵碳化物 熔盐电脱氧 催化性能
Chongqing Natural Science FoundationTangshan Science and Technology Innovation Team Training Plan Project