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Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts
A large variety of nickel‐based catalysts has been investigated for the oxygen evolution reaction (OER) in alkaline media. However, their reported activity, as well as Tafel slope values, vary greatly. To understand this variation, we studied electrodeposited Ni(80)Fe(20)OOH catalysts with different...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10108042/ https://www.ncbi.nlm.nih.gov/pubmed/36533712 http://dx.doi.org/10.1002/anie.202216477 |
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author | van der Heijden, Onno Park, Sunghak Eggebeen, Jordy J. J. Koper, Marc T. M. |
author_facet | van der Heijden, Onno Park, Sunghak Eggebeen, Jordy J. J. Koper, Marc T. M. |
author_sort | van der Heijden, Onno |
collection | PubMed |
description | A large variety of nickel‐based catalysts has been investigated for the oxygen evolution reaction (OER) in alkaline media. However, their reported activity, as well as Tafel slope values, vary greatly. To understand this variation, we studied electrodeposited Ni(80)Fe(20)OOH catalysts with different loadings at varying rotation rates, hydroxide concentrations, with or without sonication. We show that, at low current density (<5 mA cm(−2)), the Tafel slope value is ≈30 mV dec(−1) for Ni(80)Fe(20)OOH. At higher polarization, the Tafel slope continuously increases and is dependent on rotation rate, loading, hydroxide concentration and sonication. These Tafel slope values are convoluted by non‐kinetic effects, such as bubbles, potential‐dependent changes in ohmic resistance and (internal) OH(−) gradients. As best practise, we suggest that Tafel slopes should be plotted vs. current or potential. In such a plot, it can be appreciated if there is a kinetic Tafel slope or if the observed Tafel slope is influenced by non‐kinetic effects. |
format | Online Article Text |
id | pubmed-10108042 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-101080422023-04-18 Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts van der Heijden, Onno Park, Sunghak Eggebeen, Jordy J. J. Koper, Marc T. M. Angew Chem Int Ed Engl Research Articles A large variety of nickel‐based catalysts has been investigated for the oxygen evolution reaction (OER) in alkaline media. However, their reported activity, as well as Tafel slope values, vary greatly. To understand this variation, we studied electrodeposited Ni(80)Fe(20)OOH catalysts with different loadings at varying rotation rates, hydroxide concentrations, with or without sonication. We show that, at low current density (<5 mA cm(−2)), the Tafel slope value is ≈30 mV dec(−1) for Ni(80)Fe(20)OOH. At higher polarization, the Tafel slope continuously increases and is dependent on rotation rate, loading, hydroxide concentration and sonication. These Tafel slope values are convoluted by non‐kinetic effects, such as bubbles, potential‐dependent changes in ohmic resistance and (internal) OH(−) gradients. As best practise, we suggest that Tafel slopes should be plotted vs. current or potential. In such a plot, it can be appreciated if there is a kinetic Tafel slope or if the observed Tafel slope is influenced by non‐kinetic effects. John Wiley and Sons Inc. 2023-01-10 2023-02-06 /pmc/articles/PMC10108042/ /pubmed/36533712 http://dx.doi.org/10.1002/anie.202216477 Text en © 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Articles van der Heijden, Onno Park, Sunghak Eggebeen, Jordy J. J. Koper, Marc T. M. Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts |
title | Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts |
title_full | Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts |
title_fullStr | Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts |
title_full_unstemmed | Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts |
title_short | Non‐Kinetic Effects Convolute Activity and Tafel Analysis for the Alkaline Oxygen Evolution Reaction on NiFeOOH Electrocatalysts |
title_sort | non‐kinetic effects convolute activity and tafel analysis for the alkaline oxygen evolution reaction on nifeooh electrocatalysts |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10108042/ https://www.ncbi.nlm.nih.gov/pubmed/36533712 http://dx.doi.org/10.1002/anie.202216477 |
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