Determination of effective reaction area in a mixed-conducting SOFC cathode

Koji Amezawa, Y. Fujimaki, Takashi Nakamura, K. D. Bagarinao, K. Yamaji, K. Nitta, Y. Terada, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada

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

7 Citations (Scopus)

Abstract

For the quantitative analysis of the effective reaction area in an SOFC cathode, a new type of model patterned electrode was proposed and fabricated with La0.6Sr0.4CoO3-d (LSC). In situ micro X-ray absorption spectroscopy (XAS) measurements were performed in 1 bar of p(O2) at 973 K under open circuit and cathodic polarization. Absorption spectra were taken at different positions with the position resolution of less than 1 μm. The increase in the absorbance, i.e. the decrease in the oxygen potential, was observed near the interface when the electrode was cathodically polarized. The characteristic length of the effective reaction area for the patterned LSC electrode was estimated approximately 20 μm from the interface. Electrochemical impedance spectroscopy measurements were also carried out with the patterned LSC electrode. The characteristic length of the effective reaction area estimated by EIS was close to one by XAS.

Original languageEnglish
Title of host publicationSolid-Gas Electrochemical Interfaces � SGEI 1
EditorsE. Ivers-Tiffee, M. B. Mogensen, S. B. Adler, T. Kawada
PublisherElectrochemical Society Inc.
Pages129-135
Number of pages7
Edition2
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2015 Jan 1
Event1st Symposium on Solid-Gas Electrochemical Interfaces, SGEI 2015 - 227th ECS Meeting - Chicago, United States
Duration: 2015 May 242015 May 28

Publication series

NameECS Transactions
Number2
Volume66
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other1st Symposium on Solid-Gas Electrochemical Interfaces, SGEI 2015 - 227th ECS Meeting
CountryUnited States
CityChicago
Period15/5/2415/5/28

ASJC Scopus subject areas

  • Engineering(all)

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