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The origin of the high electrochemical activity of pseudo-amorphous iridium oxides

Combining high activity and stability, iridium oxide remains the gold standard material for the oxygen evolution reaction in acidic medium for green hydrogen production. The reasons for the higher electroactivity of amorphous iridium oxides compared to their crystalline counterpart is still the matt...

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Autores principales: Elmaalouf, Marine, Odziomek, Mateusz, Duran, Silvia, Gayrard, Maxime, Bahri, Mounib, Tard, Cédric, Zitolo, Andrea, Lassalle-Kaiser, Benedikt, Piquemal, Jean-Yves, Ersen, Ovidiu, Boissière, Cédric, Sanchez, Clément, Giraud, Marion, Faustini, Marco, Peron, Jennifer
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8225786/
https://www.ncbi.nlm.nih.gov/pubmed/34168129
http://dx.doi.org/10.1038/s41467-021-24181-x
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author Elmaalouf, Marine
Odziomek, Mateusz
Duran, Silvia
Gayrard, Maxime
Bahri, Mounib
Tard, Cédric
Zitolo, Andrea
Lassalle-Kaiser, Benedikt
Piquemal, Jean-Yves
Ersen, Ovidiu
Boissière, Cédric
Sanchez, Clément
Giraud, Marion
Faustini, Marco
Peron, Jennifer
author_facet Elmaalouf, Marine
Odziomek, Mateusz
Duran, Silvia
Gayrard, Maxime
Bahri, Mounib
Tard, Cédric
Zitolo, Andrea
Lassalle-Kaiser, Benedikt
Piquemal, Jean-Yves
Ersen, Ovidiu
Boissière, Cédric
Sanchez, Clément
Giraud, Marion
Faustini, Marco
Peron, Jennifer
author_sort Elmaalouf, Marine
collection PubMed
description Combining high activity and stability, iridium oxide remains the gold standard material for the oxygen evolution reaction in acidic medium for green hydrogen production. The reasons for the higher electroactivity of amorphous iridium oxides compared to their crystalline counterpart is still the matter of an intense debate in the literature and, a comprehensive understanding is needed to optimize its use and allow for the development of water electrolysis. By producing iridium-based mixed oxides using aerosol, we are able to decouple the electronic processes from the structural transformation, i.e. Ir oxidation from IrO(2) crystallization, occurring upon calcination. Full characterization using in situ and ex situ X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron microscopy allows to unambiguously attribute their high electrochemical activity to structural features and rules out the iridium oxidation state as a critical parameter. This study indicates that short-range ordering, corresponding to sub-2nm crystal size for our samples, drives the activity independently of the initial oxidation state and composition of the calcined iridium oxides.
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spelling pubmed-82257862021-07-09 The origin of the high electrochemical activity of pseudo-amorphous iridium oxides Elmaalouf, Marine Odziomek, Mateusz Duran, Silvia Gayrard, Maxime Bahri, Mounib Tard, Cédric Zitolo, Andrea Lassalle-Kaiser, Benedikt Piquemal, Jean-Yves Ersen, Ovidiu Boissière, Cédric Sanchez, Clément Giraud, Marion Faustini, Marco Peron, Jennifer Nat Commun Article Combining high activity and stability, iridium oxide remains the gold standard material for the oxygen evolution reaction in acidic medium for green hydrogen production. The reasons for the higher electroactivity of amorphous iridium oxides compared to their crystalline counterpart is still the matter of an intense debate in the literature and, a comprehensive understanding is needed to optimize its use and allow for the development of water electrolysis. By producing iridium-based mixed oxides using aerosol, we are able to decouple the electronic processes from the structural transformation, i.e. Ir oxidation from IrO(2) crystallization, occurring upon calcination. Full characterization using in situ and ex situ X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron microscopy allows to unambiguously attribute their high electrochemical activity to structural features and rules out the iridium oxidation state as a critical parameter. This study indicates that short-range ordering, corresponding to sub-2nm crystal size for our samples, drives the activity independently of the initial oxidation state and composition of the calcined iridium oxides. Nature Publishing Group UK 2021-06-24 /pmc/articles/PMC8225786/ /pubmed/34168129 http://dx.doi.org/10.1038/s41467-021-24181-x Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Elmaalouf, Marine
Odziomek, Mateusz
Duran, Silvia
Gayrard, Maxime
Bahri, Mounib
Tard, Cédric
Zitolo, Andrea
Lassalle-Kaiser, Benedikt
Piquemal, Jean-Yves
Ersen, Ovidiu
Boissière, Cédric
Sanchez, Clément
Giraud, Marion
Faustini, Marco
Peron, Jennifer
The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
title The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
title_full The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
title_fullStr The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
title_full_unstemmed The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
title_short The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
title_sort origin of the high electrochemical activity of pseudo-amorphous iridium oxides
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8225786/
https://www.ncbi.nlm.nih.gov/pubmed/34168129
http://dx.doi.org/10.1038/s41467-021-24181-x
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