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

doi:10.1149/05701.1925ecst

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

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Oxygen chemical potential distribution in a porous La_0.6Sr _0.4CoO₃-δ (LSC64) electrode on a Ce _0.9Gd_0.1CoO_1.95-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 language	English
Pages (from-to)	1925-1932
Number of pages	8
Journal	ECS Transactions
Volume	57
Issue number	1
DOIs	https://doi.org/10.1149/05701.1925ecst
Publication status	Published - 2013

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Engineering(all)

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

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.",

author = "Y. Fujimaki and H. Watanabe and Y. Terada and T. Nakamura and K. Yashiro and S. Hashimoto and T. Kawada and K. Amezawa",

year = "2013",

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T1 - Direct evaluation of oxygen chemical potential distribution in an SOFC Cathode by in situ x-ray absorption spectroscopy

AU - Fujimaki, Y.

AU - Watanabe, H.

AU - Terada, Y.

AU - Nakamura, T.

AU - Yashiro, K.

AU - Hashimoto, S.

AU - Kawada, T.

AU - Amezawa, K.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

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

Abstract

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