Standard Article

Mechanistic understanding and electrochemical modeling of mixed conducting (SOFC) electrodes

Advances in Electrocatalysis, Materials, Diagnostics and Durability

Materials for high temperature fuel cells

Fundamental models

  1. R. Merkle1,
  2. J. Maier1,
  3. J. Fleig2

Published Online: 15 DEC 2010

DOI: 10.1002/9780470974001.f500030

Handbook of Fuel Cells

Handbook of Fuel Cells

How to Cite

Merkle, R., Maier, J. and Fleig, J. 2010. Mechanistic understanding and electrochemical modeling of mixed conducting (SOFC) electrodes. Handbook of Fuel Cells. .

Author Information

  1. 1

    Vienna University of Technology, Vienna, Austria

  2. 2

    Max Planck Institute for Solid State Research, Stuttgart, Germany

Publication History

  1. Published Online: 15 DEC 2010

Abstract

In this article it is shown how the phenomenological transport parameters measured on a mixed conducting solid oxide fuel cell (SOFC) cathode are related to the underlying fundamental quantities, such as bulk defect concentrations and mobilites, and surface reaction mechanism and corresponding equilibrium exchange rate. Complications due to charged oxygen adsorbates and arising under an applied dc bias are discussed. Dense thin-film microelectrodes are shown to serve as valuable model systems for achieving a mechanistic understanding and obtaining reliable experimental data.

Keywords:

  • solid oxide fuel cell;
  • cathode;
  • mixed conductor;
  • equivalent circuit;
  • microelectrodes;
  • oxygen incorporation mechanism;
  • adsorbate coverage;
  • current-voltage-curves;
  • modeling