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Electrochemical properties of La₀.₆Sr₀.₄CoO 3 - δ thin films investigated by complementary impedance spectroscopy and isotope exchange depth profiling
Citation Link: https://doi.org/10.15480/882.3516
Publikationstyp
Journal Article
Date Issued
2014-01-22
Sprache
English
TORE-DOI
TORE-URI
Journal
Volume
256
Start Page
38
End Page
44
Citation
Solid State Ionics (256): 38-44 (2014-03-01)
Publisher DOI
Scopus ID
Publisher
Elsevier Science
The oxygen exchange and diffusion properties of La0.6Sr 0.4CoO3 - δ thin films on yttria stabilized zirconia were analyzed by impedance spectroscopy and 18O tracer experiments. The investigations were performed on the same thin film samples and at the same temperature (400 C) in order to get complementary information by the two methods. Electrochemical impedance spectroscopy can reveal resistive and capacitive contributions of such systems, but an exact interpretation of the spectra of complex oxide electrodes is often difficult from impedance data alone. It is shown that additional isotope exchange depth profiling can significantly help interpreting impedance spectra by giving reliable information on the individual contribution and exact location of resistances (surface, electrode bulk, interface). The measurements also allowed quantitative comparison of electrode polarization resistances obtained by different methods.
Subjects
Diffusion
Impedance spectroscopy
Isotope exchange
Mixed conductor
Surface exchange
ToF-SIMS
DDC Class
540: Chemie
620: Ingenieurwissenschaften
More Funding Information
Financial support by Austrian Science Fund (FWF) project P4509-N16 is gratefully acknowledged.
Publication version
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