Improved redox cycling durability in alternative Ni alloy-based SOFC anodes

Ishibashi, Yusuke and Matsumoto, Kohei and Futamura, Shotaro and Tachikawa, Yuya and Matsuda, Junko and Lyth, Stephen M. and Shiratori, Yusuke and Taniguchi, Shunsuke and Sasaki, Kazunari (2020) Improved redox cycling durability in alternative Ni alloy-based SOFC anodes. Journal of the Electrochemical Society, 167 (12). pp. 1-17. 124517. ISSN 0013-4651 (https://doi.org/10.1149/1945-7111/abac87)

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Abstract

Repeated reduction and oxidation of metallic nickel in the anodes of solid oxide fuel cell (SOFC) causes volume changes and agglomeration. This disrupts the electron conducting network, resulting in deterioration of the electrochemical performance. It is therefore desirable to develop more robust anodes with high redox stability. Here, new cermet anodes are developed, based on nickel alloyed with Co, Fe, and/or Cr. The stable phases of these different alloys are calculated for oxidizing and reducing conditions, and their electrochemical characteristics are evaluated. Whilst alloying causes a slight decrease in power generation efficiency, the Ni-alloy based anodes have significantly improved redox cycle durability. Microstructural observation reveals that alloying results in the formation of a dense oxide film on the surface of the catalyst particle (e.g. Co-oxide or a complex Fe-Ni-Cr oxide). These oxide layers help suppress oxidation of the underlying nickel catalyst particles, preventing oxidation-induced volume changes/agglomeration, and thereby preserving the electron conducting pathways. As such, the use of these alternative Ni-alloy based cermets significantly improves the redox stability of SOFC anodes.

  • Item type:Article
    ID code:85558
    Dates:
    Date
    Event
    19 August 2020
    Published
    3 August 2020
    Accepted
    23 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 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. Yusuke Ishibashi et al 2020 J. Electrochem. Soc. 167 124517 DOI 10.1149/1945-7111/abac87
    Subjects:Science > Chemistry
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:18 May 2023 10:54
    Last modified:26 Apr 2024 00:59
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/85558
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