Electrochemical characteristics of La 0.8Sr 0.2Cr 0.82Ru 0.18O 3-δ-Gd 0.1Ce 0.9O 2 solid oxide fuel cell anodes in H 2-H 2O-CO-CO 2 fuel mixtures

D. M. Bierschenk, S. A. Barnett*

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

This paper describes the performance of composite La 0.8Sr 0.2Cr 0.82Ru 0.18O 3-δ-Gd 0.1Ce 0.9O 2 anodes operated in varied H 2O-H 2, CO-CO 2, and H 2O-H 2-CO-CO 2 fuel mixtures. Impedance spectroscopy studies in both H 2O-H 2 and CO-CO 2 showed two main impedance responses that were thermally activated and exhibited power law variation with gas partial pressures. The polarization resistances in CO-CO 2 mixtures were larger than in H 2-H 2O mixtures with the same partial pressure ratios. Polarization resistances for surrogate coal syngas H 2O-H 2-CO-CO 2 fuel mixtures were higher than for H 2O-H 2-Ar mixtures with the same H 2 and H 2O partial pressures, indicating that CO or CO 2 interfered with the H 2 oxidation reaction.

Original languageEnglish (US)
Pages (from-to)95-102
Number of pages8
JournalJournal of Power Sources
Volume201
DOIs
StatePublished - Mar 1 2012

Keywords

  • Anode
  • Carbon monoxide
  • Coal gas
  • Electrochemical impedance spectroscopy
  • Oxide
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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