Title of Paper:Self-supported porous heterostructure WC/WO3?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-451 10, Greece

Journal:Journal of Advanced Ceramics

Key Words:Catalyst activity - Ceramic materials - Charge transfer - Electronic structure - Hydrogen - Oxygen vacancies - Sintering - Tungsten carbide

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 WO3?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 CO2 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/WO3?x heterostructure and the oxygen vacancies. [Figure not available: see fulltext.]. ? 2022, The Author(s).

Document Type:Journal article (JA)

Volume:11

Issue:8

Page Number:1208-1221

ISSN No.:22264108

Translation or Not:no