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Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion

Electrocatalysts for bifunctional oxygen reduction (ORR) and oxygen evolution reactions (OER) are commonly studied under hydrodynamic conditions, rendering the use of binders necessary to ensure the mechanical stability of the electrode films. The presence of a binder, however, may influence the pro...

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Autores principales: Morales, Dulce M., Villalobos, Javier, Kazakova, Mariya A., Xiao, Jie, Risch, Marcel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8457226/
https://www.ncbi.nlm.nih.gov/pubmed/34595088
http://dx.doi.org/10.1002/celc.202100744
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author Morales, Dulce M.
Villalobos, Javier
Kazakova, Mariya A.
Xiao, Jie
Risch, Marcel
author_facet Morales, Dulce M.
Villalobos, Javier
Kazakova, Mariya A.
Xiao, Jie
Risch, Marcel
author_sort Morales, Dulce M.
collection PubMed
description Electrocatalysts for bifunctional oxygen reduction (ORR) and oxygen evolution reactions (OER) are commonly studied under hydrodynamic conditions, rendering the use of binders necessary to ensure the mechanical stability of the electrode films. The presence of a binder, however, may influence the properties of the materials under examination to an unknown extent. Herein, we investigate the impact of Nafion on a highly active ORR/OER catalyst consisting of MnFeNi oxide nanoparticles supported on multi‐walled carbon nanotubes. Electrochemical studies revealed that, in addition to enhancing the mechanical stability and particle connectivity, Nafion poses a major impact on the ORR selectivity, which correlates with a decrease in the valence state of Mn according to X‐ray absorption spectroscopy. These findings call for awareness regarding the use of electrode additives, since in some cases the extent of their impact on the properties of electrode films cannot be regarded as negligible.
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spelling pubmed-84572262021-09-28 Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion Morales, Dulce M. Villalobos, Javier Kazakova, Mariya A. Xiao, Jie Risch, Marcel ChemElectroChem Communications Electrocatalysts for bifunctional oxygen reduction (ORR) and oxygen evolution reactions (OER) are commonly studied under hydrodynamic conditions, rendering the use of binders necessary to ensure the mechanical stability of the electrode films. The presence of a binder, however, may influence the properties of the materials under examination to an unknown extent. Herein, we investigate the impact of Nafion on a highly active ORR/OER catalyst consisting of MnFeNi oxide nanoparticles supported on multi‐walled carbon nanotubes. Electrochemical studies revealed that, in addition to enhancing the mechanical stability and particle connectivity, Nafion poses a major impact on the ORR selectivity, which correlates with a decrease in the valence state of Mn according to X‐ray absorption spectroscopy. These findings call for awareness regarding the use of electrode additives, since in some cases the extent of their impact on the properties of electrode films cannot be regarded as negligible. John Wiley and Sons Inc. 2021-08-16 2021-08-02 /pmc/articles/PMC8457226/ /pubmed/34595088 http://dx.doi.org/10.1002/celc.202100744 Text en © 2021 The Authors. ChemElectroChem 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 Communications
Morales, Dulce M.
Villalobos, Javier
Kazakova, Mariya A.
Xiao, Jie
Risch, Marcel
Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion
title Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion
title_full Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion
title_fullStr Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion
title_full_unstemmed Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion
title_short Nafion‐Induced Reduction of Manganese and its Impact on the Electrocatalytic Properties of a Highly Active MnFeNi Oxide for Bifunctional Oxygen Conversion
title_sort nafion‐induced reduction of manganese and its impact on the electrocatalytic properties of a highly active mnfeni oxide for bifunctional oxygen conversion
topic Communications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8457226/
https://www.ncbi.nlm.nih.gov/pubmed/34595088
http://dx.doi.org/10.1002/celc.202100744
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