Direct evaluation of oxygen chemical potential distribution in an SOFC Cathode by in situ x-ray absorption spectroscopy

Y. Fujimaki, H. Watanabe, Y. Terada, T. Nakamura, K. Yashiro, S. Hashimoto, T. Kawada, K. Amezawa

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Oxygen chemical potential distribution in a porous La0.6Sr 0.4CoO3-δ (LSC64) electrode on a Ce 0.9Gd0.1CoO1.95-δ (GDC) electrolyte under polarization was evaluated by using in situ X-ray absorption spectroscopy (XAS) at P(O2) = 10-2 bar and 873 K. The application of synchrotron X-ray focused into the submicrometer size enabled us to experimentally clarify the oxygen potential distribution in the vicinity of electrode/electrolyte interface with the position resolution of micrometer. Electrochemical impedance spectroscopy (EIS) measurements, followed by the analysis assuming the transmission line model (TLM) as an equivalent circuit, were performed with the same electrochemical cell for the XAS measurements. Based on the results by in-situ micro XAS and EIS measurements, the effective reaction area in the porous LSC64 electrode was discussed.

Original languageEnglish
Pages (from-to)1925-1932
Number of pages8
JournalECS Transactions
Volume57
Issue number1
DOIs
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Engineering(all)

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