熔盐电脱氧工艺制备纳米级(VNbTaZrHf)C高熵碳化物及其析氢反应的催化性能  

Preparation of Nanoscale(VNbTaZrHf)C High-Entropy Carbides via Molten Salt Electro-deoxidation and Its Catalytic Performance of Hydrogen Evolution Reaction

作　　者：杨宇 陈庚 李慧 梁精龙 扈玫珑[3] 胡蒙均 Yang Yu;Chen Geng;Li Hui;Liang Jinglong;Hu Meilong;Hu Mengjun(Comprehensive Testing and Analyzing Center,North China University of Science and Technology,Tangshan 063009,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Key Laboratory of Material Processing and Mold Technology,School of Mechanical Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China)

机构地区：[1]华北理工大学综合测试分析中心,河北唐山063009 [2]华北理工大学冶金与能源学院,河北唐山063210 [3]重庆大学材料科学与工程学院,重庆400044 [4]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

出　　处：《稀有金属材料与工程》2024年第6期1566-1573,共8页Rare Metal Materials and Engineering

基　　金：Chongqing Natural Science Foundation(cstc2021jcyj-msxm X1049);Tangshan Science and Technology Innovation Team Training Plan Project(21130207D)。

摘　　要：通过在1173 K的CaCl_(2)中对金属氧化物和石墨进行电脱氧,制备了具有面心立方结构的纳米级(VNbTaZrHf)C高熵碳化物(HEC)粉末。适当的温度条件有利于抑制HEC颗粒的原位烧结生长。在1 mol/L KOH溶液中进行了电化学性能测试,探索(VNbTaZrHf)C HEC的催化性能。通过极化曲线、Tafel斜率、电化学阻抗谱和双层电容值CV测试评估了(VNbTaZrHf)C HEC的催化析氢反应(HER)性能。结果表明,(VNbTaZrHf)C HEC的双层电容值为40.6 m F/cm^(2)。双层电容值越大,表明电化学活性表面积越大。由于(VNbTaZrHf)C HEC的高熵效应和纳米级结构,它表现出优异的催化HER性能,并为通过熔盐电脱氧制备HECs提供了新方法。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 CaCl_(2)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/cm^(2).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.

关 键 词：高熵碳化物 熔盐电脱氧 催化性能 

分 类 号：TQ426[化学工程]