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

Knöppel J, Möckl M, Escalera-López D, Stojanovski K, Bierling M, Böhm T, Thiele S, Rzepka M, Cherevko S (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Nature Communications Nature Publishing Group: Nature Communications

Book Volume: 12

Article Number: 2231

Journal Issue: 1

DOI: 10.1038/s41467-021-22296-9

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.

Authors with CRIS profile

Julius Knöppel Lehrstuhl für Elektrokatalyse (HIERN) Markus Bierling Professur für Electrocatalytic Interface Engineering (HIERN) Thomas Böhm Professur für Electrocatalytic Interface Engineering (HIERN) Simon Thiele Professur für Electrocatalytic Interface Engineering (HIERN)

Involved external institutions

Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern) DE Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Knöppel, J., Möckl, M., Escalera-López, D., Stojanovski, K., Bierling, M., Böhm, T.,... Cherevko, S. (2021). On the limitations in assessing stability of oxygen evolution catalysts using aqueous model electrochemical cells. Nature Communications, 12(1). https://dx.doi.org/10.1038/s41467-021-22296-9

MLA:

Knöppel, Julius, et al. "On the limitations in assessing stability of oxygen evolution catalysts using aqueous model electrochemical cells." Nature Communications 12.1 (2021).

BibTeX: Download