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Journal article

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

By Tripković, Dordije1; Küngas, Rainer2; Mogensen, Mogens Bjerg1,3; Hendriksen, Peter Vang1,4

From

Department of Energy Conversion and Storage, Technical University of Denmark1

Haldor Topsoe AS2

Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark3

Solid State Chemistry, Department of Energy Conversion and Storage, Technical University of Denmark4

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

Language: English
Publisher: The Royal Society of Chemistry
Year: 2020
Pages: 15418-15426
ISSN: 14639084 and 14639076
Types: Journal article
DOI: 10.1039/d0cp02464c
ORCIDs: Tripković, Dordije , Mogensen, Mogens Bjerg and Hendriksen, Peter Vang

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