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

Julius Knöppel (), Maximilian Möckl, Daniel Escalera-López, Kevin Stojanovski, Markus Bierling, Thomas Böhm, Simon Thiele, Matthias Rzepka and Serhiy Cherevko ()
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Julius Knöppel: Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
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)
Markus Bierling: Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
Thomas Böhm: Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
Simon Thiele: Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)
Matthias Rzepka: ZAE Bayern, Electrochemical Energy Storage
Serhiy Cherevko: Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11)

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-22296-9

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