On the width of the electrochemically active region in mixed conducting solid 
oxide fuel cell cathodes

Fleig, J.

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On the width of the electrochemically active region in mixed conducting solid oxide fuel cell cathodes

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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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Citation

Fleig, J. (2002). On the width of the electrochemically active region in mixed conducting solid oxide fuel cell cathodes. Journal of Power Sources, 105(2), 228-238.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F2F7-A

Abstract

The width of the electrochemically active zone in a mixed
conducting solid oxide fuel cell (SOFC) cathode, i.e. the
spatial extension of the three-phase-boundary (3PB) region is
numerically calculated for the case when oxide ion transport
through the electrode bulk determines the reaction rate of the
cathodic oxygen reduction reaction. The current density
distribution in the cathode exhibits a sharp maximum at the 3PB
and a major fraction of the total current flows in narrow zones
with a width of a few percent of the electrode particle size
(e.g. in the case of 1.6 mum particle size: approximately 2/3
of the current flows in a zone with a width of 60 nm). Hence,
the corresponding polarisation resistance is almost inversely
proportional to the 3PB length. In a wide parameter range an
increasing ionic conductivity of the mixed conductor does not
broaden the electrochemically active region. A formula is
presented which allows an estimate of the polarisation
resistance of a mixed conducting electrode if ionic transport
through the electrode bulk is rate limiting. (C) 2002 Elsevier
Science B.V. All rights reserved.