Insight into the Mechanisms of High Activity and Stability of Iridium Supported on Antimony-Doped Tin Oxide Aerogel for Anodes of Proton Exchange Membrane Water Electrolyzers
Saveleva VA, Wang L, Kasian O, Batuk M, Hadermann J, Gallet JJ, Bournel F, Alonso-Vante N, Ozouf G, Beauger C, Mayrhofer K, Cherevko S, Gago AS, Friedrich KA, Zafeiratos S, Savinova ER (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 10
Pages Range: 2508-2516
Journal Issue: 4
Abstract
The use of high amounts of iridium in industrial proton exchange membrane water electrolyzers (PEMWE) could hinder their widespread use for the decarbonization of society with hydrogen. Nonthermally oxidized Ir nanoparticles supported on antimony-doped tin oxide (SnO2:Sb, ATO) aerogel allow decreasing the use of the precious metal by more than 70% while enhancing the electrocatalytic activity and stability. To date, the origin of these benefits remains unknown. Here, we present clear evidence of the mechanisms that lead to the enhancement of the electrochemical properties of the catalyst. Operando near-ambient pressure X-ray photoelectron spectroscopy on membrane electrode assemblies reveals a low degree of Ir oxidation, attributed to the oxygen spill-over from Ir to SnO2:Sb. Furthermore, the formation of highly unstable Ir(III) species is mitigated, while the decrease of Ir dissolution in Ir/SnO2:Sb is confirmed by inductively coupled plasma mass spectrometry. The mechanisms that lead to the high activity and stability of Ir catalysts supported on SnO2:Sb aerogel for PEMWE are thus unveiled.
Authors with CRIS profile
Involved external institutions
Mines ParisTech / École Nationale Supérieure des Mines de Paris (ENSMP)
France (FR)
University of Antwerp / Universiteit Antwerpen
Belgium (BE)
Institut de Chimie et Procédés pour l'Energie l'Environnement et la Santé (ICPEES) / Institute of Chemistry and Processes for Energy, Environment and Health
France (FR)
National Center for Scientific Research / Centre national de la recherche scientifique (CNRS)
France (FR)
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR) / German Aerospace Center
Germany (DE)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
Université de Poitiers
France (FR)
France (FR)
University of Antwerp / Universiteit Antwerpen
Belgium (BE)
Institut de Chimie et Procédés pour l'Energie l'Environnement et la Santé (ICPEES) / Institute of Chemistry and Processes for Energy, Environment and Health
France (FR)
National Center for Scientific Research / Centre national de la recherche scientifique (CNRS)
France (FR)
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR) / German Aerospace Center
Germany (DE)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
Université de Poitiers
France (FR)
How to cite
APA:
Saveleva, V.A., Wang, L., Kasian, O., Batuk, M., Hadermann, J., Gallet, J.J.,... Savinova, E.R. (2020). Insight into the Mechanisms of High Activity and Stability of Iridium Supported on Antimony-Doped Tin Oxide Aerogel for Anodes of Proton Exchange Membrane Water Electrolyzers. ACS Catalysis, 10(4), 2508-2516. https://dx.doi.org/10.1021/acscatal.9b04449
MLA:
Saveleva, V. A., et al. "Insight into the Mechanisms of High Activity and Stability of Iridium Supported on Antimony-Doped Tin Oxide Aerogel for Anodes of Proton Exchange Membrane Water Electrolyzers." ACS Catalysis 10.4 (2020): 2508-2516.
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