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Journal Article

Ba0.5Sr0.5Co0.8Fe0.2O3-δ thin film microelectrodes investigated by impedance spectroscopy

MPS-Authors
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Baumann,  F. S.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Fleig,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Baumann, F. S., Fleig, J., Habermeier, H.-U., & Maier, J. (2006). Ba0.5Sr0.5Co0.8Fe0.2O3-δ thin film microelectrodes investigated by impedance spectroscopy. Solid State Ionics, 177, 3187-3191.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FF9B-5
Abstract
The electrochemical properties of geometrically well-defined
Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) microelectrodes have been
investigated by impedance spectroscopy. The microelectrodes of 20-100
pm diameter and 100 nm thickness were prepared by pulsed laser
deposition (PLD), photolithography and argon ion beam etching. The
oxygen reduction reaction at these model electrodes is limited by
interfacial processes, i.e. by the oxygen surface exchange and/or by
the transfer of oxide ions across the electrode/electrolyte boundary,
whereas the resistance associated with the transport of oxide ions
through the bulk of the thin film electrode is negligible. The
experiments revealed an extremely low absolute value of the
electrochemical surface exchange resistance of only 0.09 (+/- 0.03)
Omega cm(2) at 750 degrees C in air, which is more than a factor of 50
lower than the corresponding value measured for
La0.6Sr0.4Co0.8Fe0.2O3-delta (LSCF) microelectrodes of the same
geometry. The dependence of this and other electrochemical quantities
such as the chemical bulk capacitance or the BSCF/YSZ interfacial
resistance on temperature has been studied between 500 and 750 degrees
C. (c) 2006 Elsevier B.V. All rights reserved.