Journal
SOLID STATE IONICS
Volume 135, Issue 1-4, Pages 603-612Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(00)00423-9
Keywords
solid state electrochemical systems; charge transfer; three-phase boundary
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A framework is presented for defining charge-transfer and non-charge-transfer processes in solid state electrochemical systems. We examine why charge-transfer models have difficulty modeling non-charge-transfer effects, and walk through several examples including the ALS model for oxygen reduction on a porous mixed-conducting oxygen electrode. These examples illustrate that electrode 'overpotential' is often better described in terms of macroscopic thermodynamic gradients of chemical species. In the case of a porous mixed conducting oxygen electrode, oxygen reduction is limited by chemical reaction and diffusion, and may occur up to 20 microns from the electrochemical (charge-transfer) interface. (C) 2000 Elsevier Science B.V. All rights reserved.
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