Oxidation and steam reforming of CH4 on Ni and Fe Anodes under low humidity conditions in solid oxide fuel cells

Teruhisa Horita, Natsuko Sakai, Tatsuya Kawada, Harumi Yokokawa, Masayuki Dokiya

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Oxidation and steam reforming of CH4 on Ni/YSZ and Fe/YSZ cermet anodes were examined, primarily under the condition of 0 ≤ H2O/CH4 ≤ 1. In the CH4 + H2O fuel system, steam reforming occurs on anodes, generating CO and H2. The steam reforming activity of CH4 on Ni/YSZ was much higher than on Fe/YSZ at open circuit. The anodic polarization curves of an Ni/YSZ cermet electrode, both in dry CH4 and CH4 + H2O fuel systems, could be divided into two parts; one due to direct oxidation of C in the low overvoltage region, the other due to oxidation of H2 and/or CO at higher overvoltages. On the other hand, the anodic polarization curves of an Fe/YSZ cermet electrode in CH4 fuel showed behavior different from that for Ni/YSZ in the dry CH4 or the CH4-H2O fuel systems. The polarization curve in the dry CH4 fuel system showed multiple reaction slopes, while that in the CH4-H2O fuel system showed only one slope. A thermochemical calculation was made to estimate the anode surface state and the equilibrium oxygen partial pressure between the anode/YSZ interface and the gas phase.

Original languageEnglish
Pages (from-to)1161-1168
Number of pages8
JournalJournal of the Electrochemical Society
Volume143
Issue number4
DOIs
Publication statusPublished - 1996 Apr
Externally publishedYes

ASJC Scopus subject areas

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

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