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On the limitations in assessing stability of oxygen evolution catalysts using aqueous model electrochemical cells

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  • Julius Knöppel

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
    Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Maximilian Möckl

    (ZAE Bayern, Electrochemical Energy Storage)

  • Daniel Escalera-López

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11))

  • Kevin Stojanovski

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
    Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Markus Bierling

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
    Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Thomas Böhm

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
    Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Simon Thiele

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
    Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Matthias Rzepka

    (ZAE Bayern, Electrochemical Energy Storage)

  • Serhiy Cherevko

    (Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11))

Abstract

Recent research indicates a severe discrepancy between oxygen evolution reaction catalysts dissolution in aqueous model systems and membrane electrode assemblies. This questions the relevance of the widespread aqueous testing for real world application. In this study, we aim to determine the processes responsible for the dissolution discrepancy. Experimental parameters known to diverge in both systems are individually tested for their influence on dissolution of an Ir-based catalyst. Ir dissolution is studied in an aqueous model system, a scanning flow cell coupled to an inductively coupled plasma mass spectrometer. Real dissolution rates of the Ir OER catalyst in membrane electrode assemblies are measured with a specifically developed, dedicated setup. Overestimated acidity in the anode catalyst layer and stabilization over time in real devices are proposed as main contributors to the dissolution discrepancy. The results shown here lead to clear guidelines for anode electrocatalyst testing parameters to resemble realistic electrolyzer operating conditions.

Suggested Citation

  • Julius Knöppel & Maximilian Möckl & Daniel Escalera-López & Kevin Stojanovski & Markus Bierling & Thomas Böhm & Simon Thiele & Matthias Rzepka & Serhiy Cherevko, 2021. "On the limitations in assessing stability of oxygen evolution catalysts using aqueous model electrochemical cells," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22296-9
    DOI: 10.1038/s41467-021-22296-9
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    Cited by:

    1. Zhaoping Shi & Ji Li & Yibo Wang & Shiwei Liu & Jianbing Zhu & Jiahao Yang & Xian Wang & Jing Ni & Zheng Jiang & Lijuan Zhang & Ying Wang & Changpeng Liu & Wei Xing & Junjie Ge, 2023. "Customized reaction route for ruthenium oxide towards stabilized water oxidation in high-performance PEM electrolyzers," Nature Communications, Nature, vol. 14(1), pages 1-14, December.
    2. Daniel Escalera-López & Christian Iffelsberger & Matej Zlatar & Katarina Novčić & Nik Maselj & Chuyen Pham & Primož Jovanovič & Nejc Hodnik & Simon Thiele & Martin Pumera & Serhiy Cherevko, 2024. "Allotrope-dependent activity-stability relationships of molybdenum sulfide hydrogen evolution electrocatalysts," Nature Communications, Nature, vol. 15(1), pages 1-13, December.

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