Dynamic X-ray spectroscopy of La0.6Sr0. 4CoO3-δ thin film electrodes

B. S. Gerwe, K. Mizuno, O. Sekizawa, K. Nitta, K. Amezawa, S. B. Adler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dense thin films of the solid oxide fuel cell cathode material La0.6Sr0.4CoO3-δ were studied by operando X-ray absorption spectroscopy under sinusoidal voltage perturbations. This approach showed good agreement with previous steady-state µ-XAS measurements, but with high effective p(O2) resolution over several orders of magnitude. Co oxidation state varied strongest under a 0.5 Hz perturbation suggesting, in agreement with linear impedance, that oxygen exchange kinetics are most active at this timescale. Furthermore, the local structure around Co atoms response varied at different timescales; however, interpretation was limited with only preliminary analysis. Altogether, this approach was shown as a successful step towards developing a technique sensitive to local chemical state that can also separate processes by timescale.

Original languageEnglish
Title of host publicationSolid Oxide Fuel Cells 16, SOFC 2019
EditorsK. Eguchi, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages1387-1395
Number of pages9
Edition1
ISBN (Electronic)9781607688747
DOIs
Publication statusPublished - 2019 Jan 1
Event16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019 - Kyoto, Japan
Duration: 2019 Sep 82019 Sep 13

Publication series

NameECS Transactions
Number1
Volume91
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019
CountryJapan
CityKyoto
Period19/9/819/9/13

ASJC Scopus subject areas

  • Engineering(all)

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