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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...

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Autores principales: van der Heijden, Onno, Park, Sunghak, Eggebeen, Jordy J. J., Koper, Marc T. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2023
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.
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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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