Measurement of oxygen exchange kinetics on thin-film La 0.6Sr0.4CoO3-δ using nonlinear electrochemical impedance spectroscopy

Jamie R. Wilson, Maya Sase, Tatsuya Kawada, Stuart B. Adler

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

In order to probe the mechanism of O2 reduction on mixed-conducting oxides, we have measured the nonlinear harmonic impedance response of a dense thin-film electrode of La0.6 Sr0.4 CoO3-δ. By combining a well-defined geometry with detection of small nonlinear harmonics, this approach reveals the nonlinear rate law governing O2 reduction/oxidation. Comparison to various models based on nonequilibrium thermodynamics suggests that O2 reduction on La0.6 Sr0.4 CoO3-δ is limited by dissociative adsorption. To the authors' knowledge, this is the first isolation of the full nonlinear rate law governing O2 exchange on a perovskite oxide.

Original languageEnglish
Pages (from-to)81-86
Number of pages6
JournalElectrochemical and Solid-State Letters
Volume10
Issue number5
DOIs
Publication statusPublished - 2007 Mar 23

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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