Kinetic Studies on State of the Art Solid Oxide Cells: A Comparison between Hydrogen/Steam and Reformate Fuels

Jean-Claude Njodzefon, Christopher R. Graves, Mogens Bjerg Mogensen, André Weber, Johan Hjelm

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Abstract

Electrochemical reaction kinetics at the electrodes of Solid Oxide Cells (SOCs) were investigated at 700 °C for two cells with different fuel electrode microstructures as well as on a third cell with a reduced active electrode area. Three fuel mixtures were investigated – hydrogen/steam and reformate fuels hydrogen/carbon-dioxide and hydrogen/methane/steam. It was found that the kinetics at the fuel electrode were exactly the same in both reformates. The hydrogen/steam fuel displayed slightly faster kinetics than the reformate fuels. Furthermore the gas conversion impedance in the hydrogen/steam fuel split into two processes with opposing temperature behavior in the reformate fuels. An 87.5 % reduction in active electrode area diminishes the gas conversion impedance in the hydrogen/steam fuel at high fuel flow rates. In both reformates, the second and third lowest frequency processes merged into a single process as the gas conversion was reduced. The SOC with finer electrode microstructure displayed improved kinetics.
Original languageEnglish
JournalJournal of The Electrochemical Society
Volume163
Issue number13
Pages (from-to)F1451-F1462
Number of pages12
ISSN0013-4651
DOIs
Publication statusPublished - 2016

Bibliographical note

© The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.

Keywords

  • Continuously stirred tank reactor
  • Electrochemical impedance spectroscopy
  • Electrode potential
  • Gas conversion
  • Kinetics
  • Plug flow
  • Pseudo-gas conversion
  • Reformate fuel
  • Solid oxide fuel cell

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