Structural, chemical, and electrochemical characteristics of LaSr 2Fe 2CrO 9-δ-based solid oxide fuel cell anodes

Jacob M. Haag, David M. Bierschenk, Scott A. Barnett, Kenneth R. Poeppelmeier

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Solid oxide fuel cells with LaSr 2Fe 2CrO 9-δ-Gd 0.1Ce 0.9O 2-δ composite anodes were tested in H 2, H 2S-contaminated H 2, and CH 4 fuels as well as under redox cycling conditions. The La 0.9Sr 0.1Ga 0.8Mg 0.2O 3-δ electrolyte supported cells had La 0.4Ce 0.6O 2-δ barrier layers to prevent cation diffusion between LaSr 2Fe 2CrO 9-δ and La 0.9Sr 0.1Ga 0.8Mg 0.2O 3-δ. After an initial break-in where the performance improved slightly, the cells were stable in humidified H 2 with a power density > 0.4 W cm - 2 and an anode polarization resistance as low as 0.22 Ω cm 2. Anode polarization resistance showed little or no change after 15 redox cycles at 800 °C. Cell performance was stable with 22 ppm H 2S, with only a slight performance decrease relative to pure H 2, but higher H 2S concentrations caused continuous degradation. Also, the performance in humidified CH 4 fuel was quite low.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalSolid State Ionics
Volume212
DOIs
Publication statusPublished - Mar 29 2012

Keywords

  • Oxide anode
  • Perovskite
  • Redox
  • Solid oxide fuel cell
  • Sulfur tolerance

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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