Electrochemical Investigation of Model Solid Oxide Fuel Cells in H2/H2O and CO/CO2 atmospheres using Nickel Pattern Electrodes
Journal article, 2010

In this study, nickel pattern electrodes were electrochemically investigated in a three-electrode setup, operating both with H 2 / H 2 O and CO/ CO 2 atmospheres. Heating introduced structural differences in the nickel layer among the pattern electrodes, which appear to affect the electrode performance. Both dense and porous nickel pattern electrodes were formed by heating. Holes appeared in the nickel layer of the porous pattern electrodes, where the open cavity triple phase boundaries exhibited different limiting processes than open triple phase boundary electrodes of the dense electrode. As the temperature was raised in the experiment, the electrodes stabilized, with a degraded behavior that seemed to be strongly coupled to the structural changes in the electrode. It was possible to compare literature results with high temperature impedance measurements in H 2 / H 2 O presented here, while new results at lower temperatures in H 2 / H 2 O are also presented. Impedance spectroscopy measurements were performed, and the gas dependence of the polarization resistance was observed as the mixture ratios and temperatures were varied in both atmospheres. A positive relation between the polarization resistance and the partial pressure of CO was determined for the dense nickel pattern electrode, which agrees with previous results using nickel point electrodes. © 2010 The Electrochemical Society.

Author

Andreas Ehn

Lund University

Jens Høgh

Technical University of Denmark (DTU)

M. Graczyk

Lund University

K. Norrman

Technical University of Denmark (DTU)

Lars Montelius

Lund University

Mark Linne

Chalmers, Applied Mechanics, Combustion

Mogens Mogensen

Technical University of Denmark (DTU)

Journal of the Electrochemical Society

0013-4651 (ISSN)

Vol. 157 11 B1588-B1596

Subject Categories

Inorganic Chemistry

DOI

10.1149/1.3484091

More information

Latest update

3/2/2018 9