Surface-modified titanium fibers as durable carbon-free platinum catalyst supports for polymer electrolyte fuel cells

Kawachino, D. and Yasutake, M. and Noda, Z. and Matsuda, J. and Lyth, S. M. and Hayashi, A. and Sasaki, K. (2020) Surface-modified titanium fibers as durable carbon-free platinum catalyst supports for polymer electrolyte fuel cells. Journal of the Electrochemical Society, 167 (10). 104513. ISSN 0013-4651 (https://doi.org/10.1149/1945-7111/ab9cd4)

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Abstract

Carbon-based electrodes in polymer electrolyte fuel cells (PEFCs) are prone to corrosion. Therefore, alternative "carbon-free"materials are required. Here, the use of a catalyst-coated porous metal support is proposed as a gas diffusion electrode. As a proof-of-concept, commercially available porous titanium sheets comprising sintered titanium fibers are chemically etched with NaOH, followed by heat treatment. This results in the formation of oxidized titanium nanostructures (such as nanosheets and nanotubes) at the surface. Subsequently, platinum decoration is performed via arc plasma deposition (APD). This porous composite structure is then attached to the membrane, and used as the gas diffusion electrode for PEFC membrane electrode assemblies (MEAs). This concept integrates the catalyst, catalyst support, gas diffusion layer, and current collector in a single structure, cutting down on the number of cell components and reducing total device thickness. The carbon-free nature of this integrated gas diffusion electrode is demonstrated to successfully avoid carbon corrosion during start-stop potential cycling over 60,000 potential cycles. However, further improvements in initial electrochemical activity are still required.

  • Item type:Article
    ID code:85560
    Dates:
    Date
    Event
    23 June 2020
    Published
    8 June 2020
    Accepted
    22 March 2020
    Submitted
    Notes:Funding Information: This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, ), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: permissions@ioppublishing.org. Japan Science and Technology Agency (JST) COI Program Grant No. JPMJCE1318 yes This was paper 1527 presented at the Cancun, Mexico, Meeting of the Society, September 30–October 4, 2018. 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited http://creativecommons.org/licenses/by-nc-nd/4.0/ Publisher Copyright: © 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. D. Kawachino et al 2020 J. Electrochem. Soc. 167 104513 DOI 10.1149/1945-7111/ab9cd4
    Subjects:Science > Chemistry
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:18 May 2023 12:16
    Last modified:10 May 2024 01:12
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/85560
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