Oxygen Absorption in Electrocatalyst Layers Detected by Scanning Electrochemical Microscopy.
Nafion
oxygen confinement
redox chemistry
scanning electrochemical microscopy
supported catalysts
Journal
ChemElectroChem
ISSN: 2196-0216
Titre abrégé: ChemElectroChem
Pays: Germany
ID NLM: 101679112
Informations de publication
Date de publication:
02 Aug 2021
02 Aug 2021
Historique:
received:
24
05
2021
revised:
24
06
2021
entrez:
30
9
2021
pubmed:
1
10
2021
medline:
1
10
2021
Statut:
ppublish
Résumé
Scanning electrochemical microscopy (SECM) is able to track the local electrochemical activity of an electrolyte-immersed substrate employing an ultra-micro-electrode (UME) in micrometer-scale spatial resolution. In this study, SECM is employed to investigate the presence of oxygen in the electrocatalyst layers of polymer electrolyte membrane fuel cells and electrolyzers. Approach curves on electrocatalyst layers with the tip potential set for oxygen reduction reveal that a significant amount of oxygen is absorbed in the catalyst layer. We confirm that the coexistence of Nafion ionomer and carbon black leads to oxygen confinement. It is suggested that this oxygen is confined within the hydrophobic parts of the self-assembled Nafion on the graphitic surfaces of the carbon black.
Identifiants
pubmed: 34589380
doi: 10.1002/celc.202100702
pii: CELC202100702
pmc: PMC8457140
doi:
Types de publication
Journal Article
Langues
eng
Pagination
2950-2955Informations de copyright
© 2021 The Authors. ChemElectroChem published by Wiley-VCH GmbH.
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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