Surface chemistry of La0.6Sr0.4CoO3−δ thin films and its impact on the oxygen surface exchange resistance

The surface composition of dense La 0.6 Sr 0.4 CoO 3− δ (LSC) thin film model electrodes, deposited by pulsed laser deposition at 600 °C on yttria-stabilized zirconia (100) electrolytes, was investigated by low-energy ion scattering (LEIS) and time resolved inductively coupled plasma mass spectromet...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2015-11, Vol.3 (45), p.22759-22769
Main Authors: Rupp, Ghislain M, Téllez, Helena, Druce, John, Limbeck, Andreas, Ishihara, Tatsumi, Kilner, John, Fleig, Jürgen
Format: Article
Language:English
Subjects:
Electrochemical impedance spectroscopy
Exchange
Low energy ion scattering
Oxygen
Strontium
Surface layer
Thin films
Yttria stabilized zirconia
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Summary:The surface composition of dense La 0.6 Sr 0.4 CoO 3− δ (LSC) thin film model electrodes, deposited by pulsed laser deposition at 600 °C on yttria-stabilized zirconia (100) electrolytes, was investigated by low-energy ion scattering (LEIS) and time resolved inductively coupled plasma mass spectrometry (ICP-MS). Results obtained by both methods agree qualitatively and quantitatively and provide a comprehensive picture of the surface composition and cation diffusion kinetics of LSC. The measurements revealed that freshly prepared LSC thin films already show a Sr-rich and Co-poor termination layer (80% Sr surface coverage). This Sr-rich surface layer was proven to be an equilibrium property of LSC as it forms again at elevated temperatures after removal. The kinetics of this surface reconstruction is surprisingly fast (
ISSN:2050-7488
2050-7496
DOI:10.1039/c5ta05279c