Microstructure-property relations of solid oxide fuel cell cathodes and current collectors cathodic polarization and ohmic resistance

K. Sasaki, J. P. Wurth, R. Gschwend, M. Gödickemeier, L. J. Gauckler

Research output: Contribution to journalArticlepeer-review

166 Citations (Scopus)

Abstract

Microstructure, cathodic polarization, and ohmic resistance on the cathode side of ZrO2-based solid oxide fuel cells have been studied for the intermediate temperature operation range between 700 and 900°C. Starting powder characteristics, powder calcination temperature, and sintering temperature strongly influence the final microstructure of cathodes. Electrochemical performance depends on these processing parameters as well as on the cathode thickness and the contact spacing of current collectors. A decrease in effective electrode area occurs both on the microscopic level with coarse and inhomogeneous cathode microstructure and on the macroscopic level with a wide contact spacing of the current collectors. The smaller effective electrode area causes inhomogeneous current density distribution and results consequently in higher ohmic losses originating from the electrolyte and higher cathodic polarization. These losses are evaluated using La0.35Sr0.15MnO3 cathodes with different microstructures and on the ZrO2-8 mole percent Y2O3 electrolyte. The influence of current path constrictions on the ohmic and nonohmic losses is demonstrated using Pt current collectors of different geometric spacings.

Original languageEnglish
Pages (from-to)530-543
Number of pages14
JournalJournal of the Electrochemical Society
Volume143
Issue number2
DOIs
Publication statusPublished - Feb 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Microstructure-property relations of solid oxide fuel cell cathodes and current collectors cathodic polarization and ohmic resistance'. Together they form a unique fingerprint.

Cite this