Oxygen nonstoichiometry and electrochemical properties in a thin film of nickel substituted lanthanum cobaltite for SOFCs

Y. Uzumaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Oxygen nonstoichiometry of LaNi0.6Co0.4O 3-δ (LNC64) was measured by thermogravimetry, and electrochemical properties of thin film electrode were evaluated by ac impedance measurement around OCV and applied dc biases. At 873 and 973 K, δ in LaNi0.6Co0.4O3-δ was below 0.003 in all measured p(O2) range while δ increased to 0.011 at p(O 2) = 10-4 bar at 1073K. From the comparison between chemical capacitance which was estimated from the oxygen nonstoichiometry and evaluated from ac impedance measurement, it was suggested that the ratedetermining step was surface reaction or bulk diffusion. The area specific interfacial conductivity σE for LNC64 film electrode was c.a.5.6 Scm -2 at 1073 K in air. Since the σE tendency in LNC64 film electrode well accorded with the oxygen nonstoichiometry and the capacitance for electrode reaction, it is suggested that ionic conduction was enhanced at 1073 K.

Original languageEnglish
Pages (from-to)1893-1899
Number of pages7
JournalECS Transactions
Volume57
Issue number1
DOIs
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Engineering(all)

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