Journal Article

FZJ-2018-01609

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Common Intermediates of Oxygen Evolution and Dissolution Reactions during Water Electrolysis on Iridium

Kasian, O. (Corresponding author) ; Grote, J.-P. ; Geiger, S. ; Cherevko, S.FZJ* ; Mayrhofer, K.FZJ*

2018
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/17568  doi:10.1002/anie.201709652

Abstract: Understanding the pathways of catalyst degradation during the oxygen evolution reaction is a cornerstone in the development of efficient and stable electrolyzers, since even for the most promising Ir based anodes the harsh reaction conditions are detrimental. The dissolution mechanism is complex and the correlation to the oxygen evolution reaction itself is still poorly understood. Here, by coupling a scanning flow cell with inductively coupled plasma and online electrochemical mass spectrometers, we monitor the oxygen evolution and degradation products of Ir and Ir oxides in situ. It is shown that at high anodic potentials several dissolution routes become possible, including formation of gaseous IrO3. On the basis of experimental data, possible pathways are proposed for the oxygen-evolution-triggered dissolution of Ir and the role of common intermediates for these reactions is discussed.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 134 - Electrolysis and Hydrogen (POF3-134) (POF3-134)

Appears in the scientific report 2018

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Database coverage:
; ; ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 10 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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