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

Ghislain M. Rupp; Helena Téllez; John Druce; Andreas Limbeck; Tatsumi Ishihara; John Kilner; Jürgen Fleig

doi:10.1039/c5ta05279c

Surface chemistry of La_0.6Sr_0.4CoO_3-δ thin films and its impact on the oxygen surface exchange resistance

Ghislain M. Rupp, Helena Téllez, John Druce, Andreas Limbeck, Tatsumi Ishihara, John Kilner, Jürgen Fleig

Research output: Contribution to journal › Article › peer-review

102 Citations (Scopus)

Abstract

The surface composition of dense La_0.6Sr_0.4CoO_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 (<1 h at 550 °C) and indicates high Sr mobility in LSC. Electrochemical Impedance Spectroscopy (EIS) measurements at 400 °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.

Original language	English
Pages (from-to)	22759-22769
Number of pages	11
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	45
DOIs	https://doi.org/10.1039/c5ta05279c
Publication status	Published - 2015

All Science Journal Classification (ASJC) codes

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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Access to Document

10.1039/c5ta05279c

Cite this

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title = "Surface chemistry of La0.6Sr0.4CoO3-δ thin films and its impact on the oxygen surface exchange resistance",

abstract = "The surface composition of dense La0.6Sr0.4CoO3-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 (<1 h at 550 °C) and indicates high Sr mobility in LSC. Electrochemical Impedance Spectroscopy (EIS) measurements at 400 °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.",

author = "Rupp, {Ghislain M.} and Helena T{\'e}llez and John Druce and Andreas Limbeck and Tatsumi Ishihara and John Kilner and J{\"u}rgen Fleig",

year = "2015",

doi = "10.1039/c5ta05279c",

language = "English",

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pages = "22759--22769",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Surface chemistry of La0.6Sr0.4CoO3-δ thin films and its impact on the oxygen surface exchange resistance

AU - Rupp, Ghislain M.

AU - Téllez, Helena

AU - Druce, John

AU - Limbeck, Andreas

AU - Ishihara, Tatsumi

AU - Kilner, John

AU - Fleig, Jürgen

PY - 2015

Y1 - 2015

N2 - The surface composition of dense La0.6Sr0.4CoO3-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 (<1 h at 550 °C) and indicates high Sr mobility in LSC. Electrochemical Impedance Spectroscopy (EIS) measurements at 400 °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.

AB - The surface composition of dense La0.6Sr0.4CoO3-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 (<1 h at 550 °C) and indicates high Sr mobility in LSC. Electrochemical Impedance Spectroscopy (EIS) measurements at 400 °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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