Title of Paper:Self-supported porous heterostructure WC/WO_(3?x)ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

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Affiliation of Author(s):[1]CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China;[2]School of Materials Science and Engineering,Henan Key Laboratory of Special Protective Materials,Luoyang Institute of Science and Technology,Luoyang 471023,China;[3]Yangtze Delta Region Institute(Huzhou),University of Electronic Science and Technology of China,Huzhou 313001,China;[4]School of Energy Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;[5]CAS Key Laboratory of Mechanical Behaviors and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026,China;[6]Department of Materials Science and Engineering,University of Ioannina,Ioannina GR-45110,Greece

Journal:先进陶瓷（英文）

Key Words:hydrogen evolution reaction(HER);porous ceramic membrane;WC/WO_(3?x)heterostructure;self-supported electrode;oxygen vacancies

Abstract:Tungsten carbide(WC)-based materials are widely considered as the hydrogen evolution reaction(HER)process catalysts due to their“Pt-like”electronic structure.Nonetheless,traditional powder electrodes have a high cost,and display problems related to the process itself and the poor stability over operation time.This paper presented a self-supported asymmetric porous ceramic electrode with WO_(3-x)whiskers formed in situ on the walls of the finger-like holes and membrane surface,which was prepared by combining phase inversion tape-casting,pressureless sintering,and thermal treatment in a CO_(2) atmosphere.The optimized ceramic electrode displayed good catalytic HER activity and outstanding stability at high current densities.More specifically,it demonstrated the lowest overpotentials of 107 and 123 mV and the lowest Tafel slopes of 59.3 and 72.4 mV·dec^(-1)at 10 mA·cm^(-2)in acidic and alkaline media,respectively.This superior performance was ascribed to the structure of the ceramic membrane and the charge transfer efficiency,which was favored by the in situ developed WC/WO_(3-x)heterostructure and the oxygen vacancies.

Volume:11

Issue:8

Page Number:1208-1221

ISSN No.:2226-4108

Translation or Not:no

CN No.:10-1154/TQ