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Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation
Understanding the function of surface states on photoanodes is crucial for unraveling the underlying reaction mechanisms of water oxidation. For hematite photoanodes, only one type of surface states with higher oxidative energy (S1) has been proposed and verified as reaction intermediate, while the...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7801602/ https://www.ncbi.nlm.nih.gov/pubmed/33431853 http://dx.doi.org/10.1038/s41467-020-20510-8 |
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author | Li, Jingguo Wan, Wenchao Triana, Carlos A. Chen, Hang Zhao, Yonggui Mavrokefalos, Christos K. Patzke, Greta R. |
author_facet | Li, Jingguo Wan, Wenchao Triana, Carlos A. Chen, Hang Zhao, Yonggui Mavrokefalos, Christos K. Patzke, Greta R. |
author_sort | Li, Jingguo |
collection | PubMed |
description | Understanding the function of surface states on photoanodes is crucial for unraveling the underlying reaction mechanisms of water oxidation. For hematite photoanodes, only one type of surface states with higher oxidative energy (S1) has been proposed and verified as reaction intermediate, while the other surface state located at lower potentials (S2) was assigned to inactive or recombination sites. Through employing rate law analyses and systematical (photo)electrochemical characterizations, here we show that S2 is an active reaction intermediate for water oxidation as well. Furthermore, we demonstrate that the reaction kinetics and dynamic interactions of both S1 and S2 depend significantly on operational parameters, such as illumination intensity, nature of the electrolyte, and applied potential. These insights into the individual reaction kinetics and the interplay of both surface states are decisive for designing efficient photoanodes. |
format | Online Article Text |
id | pubmed-7801602 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-78016022021-01-21 Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation Li, Jingguo Wan, Wenchao Triana, Carlos A. Chen, Hang Zhao, Yonggui Mavrokefalos, Christos K. Patzke, Greta R. Nat Commun Article Understanding the function of surface states on photoanodes is crucial for unraveling the underlying reaction mechanisms of water oxidation. For hematite photoanodes, only one type of surface states with higher oxidative energy (S1) has been proposed and verified as reaction intermediate, while the other surface state located at lower potentials (S2) was assigned to inactive or recombination sites. Through employing rate law analyses and systematical (photo)electrochemical characterizations, here we show that S2 is an active reaction intermediate for water oxidation as well. Furthermore, we demonstrate that the reaction kinetics and dynamic interactions of both S1 and S2 depend significantly on operational parameters, such as illumination intensity, nature of the electrolyte, and applied potential. These insights into the individual reaction kinetics and the interplay of both surface states are decisive for designing efficient photoanodes. Nature Publishing Group UK 2021-01-11 /pmc/articles/PMC7801602/ /pubmed/33431853 http://dx.doi.org/10.1038/s41467-020-20510-8 Text en © The Author(s) 2021 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/. |
spellingShingle | Article Li, Jingguo Wan, Wenchao Triana, Carlos A. Chen, Hang Zhao, Yonggui Mavrokefalos, Christos K. Patzke, Greta R. Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
title | Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
title_full | Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
title_fullStr | Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
title_full_unstemmed | Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
title_short | Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
title_sort | reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7801602/ https://www.ncbi.nlm.nih.gov/pubmed/33431853 http://dx.doi.org/10.1038/s41467-020-20510-8 |
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