4.7 Article

CoMo heterohierarchical foam-structured cathode for anion exchange membrane water electrolyzer

期刊

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 4, 页码 2093-2102

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.10.147

关键词

Hydrogen evolution reaction; Electrodeposition; Heterohierarchical structure; Cobalt-molybdenum

资金

  1. National Research Foundation of Korea - Korea government MSIT [2021R1A2C2093358, 2021R1A43027878, 2019M3E6A1103818]
  2. KIST Institutional Program [2E31002-21-025]
  3. National Research Foundation of Korea [2019M3E6A1103818, 2021R1A2C2093358] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

A simple method was developed to design a heterohierarchical CoMo catalyst, which exhibited lower overpotential in the alkaline hydrogen evolution reaction by optimizing electrodeposition conditions. The optimized catalyst showed a heterohierarchical structure with a synergistic effect between the Co and Mo incorporated Co.
It is important to consider the synergy of heterostructures to improve the slow kinetics of water dissociation in the alkaline hydrogen evolution reaction (HER). Herein, we report a simple method to design a heterohierarchical CoMo catalyst. The CoMo catalyst was prepared by simple one-pot electrodeposition on carbon paper (CP). The CoMo/CP catalyst was optimized for the alkaline HER by controlling the electrodeposition bath conditions, po-tential, and time. The optimized catalyst shows the heterohierarchical structure containing the electrically conductive metallic Co in the bulk and Mo-incorporated Co containing Mo4+ at the surface. It exhibited a lower HER overpotential of 0.11 V at-20 mA/cm(2) compared to those of the others owing to the synergetic effect of the between the Co and Mo incorporated Co. The results highlight the advantages of the simple method developed herein for the design of heterohierarchical catalysts. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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