Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 45, Pages 22759-22769Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05279c
Keywords
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Funding
- Austrian Science Fund (FWF) [P21960-N17, W1243]
- International Institute for Carbon Neutral Energy Research (wpi-I2CNER) - World Premier Research Center Initiative of the Ministry of Education, Culture, Sports, Science and Technology
- Japanese Society for Promotion of Science (JSPS postdoctoral fellowship)
- Japanese Society for Promotion of Science (Kakenhi) [P13770]
- Grants-in-Aid for Scientific Research [13F03770] Funding Source: KAKEN
- Austrian Science Fund (FWF) [W1243] Funding Source: Austrian Science Fund (FWF)
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The surface composition of dense La0.6Sr0.4CoO3-delta (LSC) thin film model electrodes, deposited by pulsed laser deposition at 600 degrees 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 (<1 h at 550 degrees C) and indicates high Sr mobility in LSC. Electrochemical Impedance Spectroscopy (EIS) measurements at 400 degrees C revealed the detrimental effect of this surface layer on the oxygen surface exchange and suggest that higher Co concentrations in the termination layer facilitate the oxygen exchange reaction.
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