Operando Isotopic Exchange in Solid Oxide Fuel Cells: Oxygen-Transport Dependency on Applied Potential.
SOFCs
isotopic exchange
operando methods
oxygen electrochemistry
platinum
Journal
Chemphyschem : a European journal of chemical physics and physical chemistry
ISSN: 1439-7641
Titre abrégé: Chemphyschem
Pays: Germany
ID NLM: 100954211
Informations de publication
Date de publication:
16 10 2020
16 10 2020
Historique:
received:
06
07
2020
revised:
04
09
2020
pubmed:
11
9
2020
medline:
11
9
2020
entrez:
10
9
2020
Statut:
ppublish
Résumé
The oxygen isotopic exchange technique is a powerful tool to investigate the oxygen transport kinetics in an oxide solid. In a solid oxide fuel cell, isotopic surface exchange and diffusion coefficients are classically determined by using the Isotopic Exchange Depth Profiling method followed by ex situ SIMS characterizations. Despite its relevance, the utilization of in situ or operando techniques to measure the isotopic exchange under an electrical bias remains marginal. We developed here a set-up which enables operando monitoring of oxygen exchange in SOFC type cells under polarization. The system has been used for studying the oxygen mobility dependency upon polarization on a symmetrical Pt/YSZ/Pt cell (YSZ: yttria-stabilized zirconia). Homomolecular and heterolytic exchange reactions were undertaken to investigate the oxygen activation step and discriminate the limiting step among the sequence of elementary steps which constitute the oxygen transport process in the SOFC system. Oxygen ions incorporation into the dense ionic conductor was identified to be the rate determining step, and its first order rate constant dependency on applied potential was established.
Identifiants
pubmed: 32909683
doi: 10.1002/cphc.202000574
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2357-2363Subventions
Organisme : European Union (ERDF)
Pays : International
Organisme : "Région Nouvelle Aquitaine"
Pays : International
Informations de copyright
© 2020 Wiley-VCH GmbH.
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