On the Origin of the Improved Ruthenium Stability in RuO2-IrO2 Mixed Oxides

Kasian O, Geiger S, Stock P, Polymeros G, Breitbach B, Savan A, Ludwig A, Cherevko S, Mayrhofer K (2016)

Publication Status: Published

Publication Type: Journal article

Publication year: 2016

Journal

Journal of The Electrochemical Society Electrochemical Society

Publisher: ELECTROCHEMICAL SOC INC

Book Volume: 163

Pages Range: F3099-F3104

Journal Issue: 11

DOI: 10.1149/2.0131611jes

Abstract

High oxygen evolution reaction activity of ruthenium and long term stability of iridium in acidic electrolytes make their mixed oxides attractive candidates for utilization as anodes in water electrolyzers. Indeed, such materials were addressed in numerous previous studies. The application of a scanning flow cell connected to an inductively coupled plasma mass spectrometer allowed us now to examine the stability and activity toward oxygen evolution reaction of such mixed oxides in parallel. The whole composition range of Ir-Ru mixtures has been covered in a thin film material library. In the whole composition range the rate of Ru dissolution is observed to be much higher than that of Ir. Eventually, due to the loss of Ru, the activity of the mixed oxides approaches the value corresponding to pure IrO2. Interestingly, the loss of only a few percent of a monolayer in Ru surface concentration results in a significant drop in activity. Several explanations of this phenomenon are discussed. It is concluded that the herein observed stability of mixed Ir-Ru oxide systems is most likely a result of high corrosion resistance of the iridium component, but not due to an alteration of the material's electronic structure. (C) The Author(s) 2016. Published by ECS. All rights reserved.

Authors with CRIS profile

Karl Mayrhofer Lehrstuhl für Elektrokatalyse (HIERN)

Involved external institutions

Ruhr-Universität Bochum (RUB) DE Germany (DE) Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE)

How to cite

APA:

Kasian, O., Geiger, S., Stock, P., Polymeros, G., Breitbach, B., Savan, A.,... Mayrhofer, K. (2016). On the Origin of the Improved Ruthenium Stability in RuO2-IrO2 Mixed Oxides. Journal of The Electrochemical Society, 163(11), F3099-F3104. https://doi.org/10.1149/2.0131611jes

MLA:

Kasian, Olga, et al. "On the Origin of the Improved Ruthenium Stability in RuO2-IrO2 Mixed Oxides." Journal of The Electrochemical Society 163.11 (2016): F3099-F3104.

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