H 2S poisoning of solid oxide fuel cells

K. Sasaki, K. Susuki, A. Iyoshi, M. Uchimura, N. Imamura, H. Kusaba, Y. Teraoka, H. Fuchino, K. Tsujimoto, Y. Uchida, N. Jingo

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229 Citations (Scopus)

Abstract

The influence of H2 S fuel impurity on power generation characteristics of solid oxide fuel cells (SOFCs) has been analyzed by measuring cell voltage at a constant current density, as a function of H2 S concentration, operational temperature, and fuel gas composition. Reversible cell voltage change was observed around 1000°C, while fatal irreversible degradation occurred at a lower operational temperature, at a higher H2 S concentration, and at a lower fuel H2 CO ratio. Sulfur tolerance of SOFCs was improved by using Sc2 O3 -doped Zr O2 instead of Y2 O3 -doped Zr O2 as electrolyte and/or as electrolyte component in the anode cermets. It has been found that H2 S poisoning consists of at least two stages, i.e., an initial cell voltage drop within a short time period to a metastable cell voltage, followed by a gradual larger cell voltage drop. Possible H2 S poisoning processes are discussed.

Original languageEnglish
Article number009611JES
Pages (from-to)A2023-A2029
JournalJournal of the Electrochemical Society
Volume153
Issue number11
DOIs
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

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

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