Passivation and activation of La0.6Sr0.4FeO3thin film electrodes

Dordije Tripković*, Rainer Küngas, Mogens Bjerg Mogensen, Peter Vang Hendriksen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The oxygen exchange activity of thin dense La0.6Sr0.4FeO3 electrodes prepared by pulsed laser deposition was investigated by electrochemical impedance spectroscopy and electrical conductivity relaxation below 600 °C. The value of the surface exchange coefficient (kchem) measured at 491 °C decreased from an initial 4.4 × 10-6 cm s-1 to 1.7 × 10-7 cm s-1 after aging for 7 days. The rapid decrease in the oxygen exchange rate was accompanied by the increase in the surface concentration of 'non-lattice strontium' detected by X-ray photoelectron spectroscopy. Subsequent electrochemical tests over 40 days showed that the electrode performance could be recovered by rinsing the passivated electrode in deionized water. Repeated treatments eventually also led to improved stability of electrochemical performance. This journal is

Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number27
Pages (from-to)15418-15426
ISSN1463-9076
DOIs
Publication statusPublished - 2020

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