Determination of the oxygen permeation flux through La0.75Ca0.25CrO3-δ by an electrochemical method

Natsuko Sakai, Katsuhiko Yamaji, Teruhisa Horita, Harumi Yokokawa, Tatsuya Kawada, Masayuki Dokiya, Ken Ichi Hiwatashi, Akira Ueno, Masanobu Aizawa

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10 Citations (Scopus)

Abstract

The oxygen permeation flux measured as the oxide ion current density (Jo(2)-) through La0.75Ca0.25CrO3-δ was determined at steady state by using an electrochemical method in the po2 range from 105 to 10-11 Pa at T = 1273 K. The oxygen vacancy diffusion coefficient (Dv) is estimated to be 1.5 × 10-9 m2 s-1 in the po2 region from 1 to 10-5 Pa. When po2 is lower than 10-5 Pa, Jo(2)- seems to depend on a surface reaction as the rate-determining step. The contribution of grain-boundary diffusion on permeation was considered in the oxidizing atmosphere. The oxygen permeation current density through a 1 mm thick plate is estimated as 0.03 A cm-2 in the solid oxide fuel cell operation.

Original languageEnglish
Pages (from-to)1341-1345
Number of pages5
JournalJournal of the Electrochemical Society
Volume146
Issue number4
DOIs
Publication statusPublished - 1999 Apr

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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