Carbonaceous Hydrogen-Evolution Catalyst Containing Cobalt Surrounded by a Tuned Local Structure

Authors

  • Dr. Jun Maruyama,

    Corresponding author
    1. Environmental Technology Research Division, Osaka Municipal Technical Research Institute, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553 (Japan)
    • Environmental Technology Research Division, Osaka Municipal Technical Research Institute, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553 (Japan)

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  • Dr. Tsutomu Ioroi,

    1. Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577 (Japan)
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  • Dr. Takahiro Hasegawa,

    1. Environmental Technology Research Division, Osaka Municipal Technical Research Institute, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553 (Japan)
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  • Takuya Mori,

    1. Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501 (Japan)
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  • Dr. Yuki Orikasa,

    1. Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501 (Japan)
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  • Prof. Yoshiharu Uchimoto

    1. Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501 (Japan)
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Abstract

The low activity and durability of noble-metal-free catalysts in acidic media are major problems that hinder their practical use. This study reports significantly enhanced activity of a cobalt-containing carbonaceous catalyst used for the hydrogen-evolution reaction in a water electrolyzer by using a proton-exchange membrane (PEM), which is an efficient energy-conversion device that is suitable for intermittent renewable energy sources. On the basis of X-ray absorption near-edge structure, the enhancement in activity was attributed to a change in the local structure surrounding the Co atom. The PEM water electrolyzer formed by using the catalyst with an optimized structure and Co surface concentration showed an enthalpy efficiency of 80 % at 1 A cm−2.

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