Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases

Kazunari Sasaki, Y. Hori, R. Kikuchi, K. Eguchi, A. Ueno, H. Takeuchi, M. Aizawa, K. Tsujimoto, H. Tajiri, H. Nishikawa, Y. Uchidad

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Abstract

Current-voltage (I-V) characteristics and electrode impedance of a tubular-type solid oxide fuel cell (SOFC) were analyzed for mixed fuel gases, consisting mainly of CO, H2, H2O, and a carrier gas, as simulated reformed gas of hydrocarbons or coal gas. I-V characteristics of a single cell were measured as a function of various operational parameters including the H2-to-CO ratio, the type of carrier gas such as He, N2, and Ar, the temperature, the fuel-to-carrier gas ratio, and the water vapor concentration. It has been experimentally confirmed that the use of CO-rich gases results in comparable performance to that of H2-rich gases and thus mixed gas such as coal gas is useful as a SOFC fuel. We have found, for the first time, that the I-V characteristics depend on the carrier gas, indicating the importance of gas transport in porous anodes for anodic polarization. The change in cell voltage by varying fuel compositions was mainly caused by the change in anode impedance associated with a low frequency semicircle in a Cole-Cole impedance plot at 1000°C. The fuel gas compositions in thermodynamic equilibrium were calculated and compared with the initial gas compositions, suggesting the importance of water vapor concentration to control the equilibrium H2-to-CO ratio for CO-rich fuel gases.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume149
Issue number3
DOIs
Publication statusPublished - Mar 1 2002

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Carbon Monoxide
Current voltage characteristics
Solid oxide fuel cells (SOFC)
Gases
Coal gas
Gas fuels
Steam
Mixed gas fuels
Water vapor
Anodes
Chemical analysis
Anodic polarization
Electric potential
Hydrocarbons
Thermodynamics
Electrodes

All Science Journal Classification (ASJC) codes

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

Cite this

Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases. / Sasaki, Kazunari; Hori, Y.; Kikuchi, R.; Eguchi, K.; Ueno, A.; Takeuchi, H.; Aizawa, M.; Tsujimoto, K.; Tajiri, H.; Nishikawa, H.; Uchidad, Y.

In: Journal of the Electrochemical Society, Vol. 149, No. 3, 01.03.2002.

Research output: Contribution to journalArticle

Sasaki, K, Hori, Y, Kikuchi, R, Eguchi, K, Ueno, A, Takeuchi, H, Aizawa, M, Tsujimoto, K, Tajiri, H, Nishikawa, H & Uchidad, Y 2002, 'Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases', Journal of the Electrochemical Society, vol. 149, no. 3. https://doi.org/10.1149/1.1435357
Sasaki, Kazunari ; Hori, Y. ; Kikuchi, R. ; Eguchi, K. ; Ueno, A. ; Takeuchi, H. ; Aizawa, M. ; Tsujimoto, K. ; Tajiri, H. ; Nishikawa, H. ; Uchidad, Y. / Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases. In: Journal of the Electrochemical Society. 2002 ; Vol. 149, No. 3.
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