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Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction
The effect of surface orientations on the formation of iridium oxide species during the oxygen evolution reaction (OER) remains yet unknown. Herein, we use a needle‐shaped iridium atom probe specimen as a nanosized working electrode to ascertain the role of the surface orientations in the formation...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8518547/ https://www.ncbi.nlm.nih.gov/pubmed/34343398 http://dx.doi.org/10.1002/anie.202106790 |
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author | BalaKrishnan, Arjun Blanc, Niclas Hagemann, Ulrich Gemagami, Parham Wonner, Kevin Tschulik, Kristina Li, Tong |
author_facet | BalaKrishnan, Arjun Blanc, Niclas Hagemann, Ulrich Gemagami, Parham Wonner, Kevin Tschulik, Kristina Li, Tong |
author_sort | BalaKrishnan, Arjun |
collection | PubMed |
description | The effect of surface orientations on the formation of iridium oxide species during the oxygen evolution reaction (OER) remains yet unknown. Herein, we use a needle‐shaped iridium atom probe specimen as a nanosized working electrode to ascertain the role of the surface orientations in the formation of oxide species during OER. At the beginning of electrolysis, the top 2–3 nm of (024), (026), (113), and (115) planes are covered by IrO−OH, which activates all surfaces towards OER. A thick subsurface oxide layer consisting of sub‐stoichiometric Ir−O species is formed on the open (024) planes as OER proceeds. Such metastable Ir−O species are thought to provide an additional contribution to the OER activity. Overall, this study sheds light on the importance of the morphological effects of iridium electrocatalysts for OER. It also provides an innovative approach that can directly reveal surface species on electrocatalysts at atomic scale. |
format | Online Article Text |
id | pubmed-8518547 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-85185472021-10-21 Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction BalaKrishnan, Arjun Blanc, Niclas Hagemann, Ulrich Gemagami, Parham Wonner, Kevin Tschulik, Kristina Li, Tong Angew Chem Int Ed Engl Research Articles The effect of surface orientations on the formation of iridium oxide species during the oxygen evolution reaction (OER) remains yet unknown. Herein, we use a needle‐shaped iridium atom probe specimen as a nanosized working electrode to ascertain the role of the surface orientations in the formation of oxide species during OER. At the beginning of electrolysis, the top 2–3 nm of (024), (026), (113), and (115) planes are covered by IrO−OH, which activates all surfaces towards OER. A thick subsurface oxide layer consisting of sub‐stoichiometric Ir−O species is formed on the open (024) planes as OER proceeds. Such metastable Ir−O species are thought to provide an additional contribution to the OER activity. Overall, this study sheds light on the importance of the morphological effects of iridium electrocatalysts for OER. It also provides an innovative approach that can directly reveal surface species on electrocatalysts at atomic scale. John Wiley and Sons Inc. 2021-08-25 2021-09-20 /pmc/articles/PMC8518547/ /pubmed/34343398 http://dx.doi.org/10.1002/anie.202106790 Text en © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. |
spellingShingle | Research Articles BalaKrishnan, Arjun Blanc, Niclas Hagemann, Ulrich Gemagami, Parham Wonner, Kevin Tschulik, Kristina Li, Tong Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction |
title | Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction |
title_full | Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction |
title_fullStr | Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction |
title_full_unstemmed | Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction |
title_short | Direct Detection of Surface Species Formed on Iridium Electrocatalysts during the Oxygen Evolution Reaction |
title_sort | direct detection of surface species formed on iridium electrocatalysts during the oxygen evolution reaction |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8518547/ https://www.ncbi.nlm.nih.gov/pubmed/34343398 http://dx.doi.org/10.1002/anie.202106790 |
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