Solid oxide fuel cell using CO–H<sub>2</sub>O mixed gas fuel

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  • KITAZAKI Yoshinobu
    Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University
  • SHIMONOSONO Taro
    Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University
  • HIRATA Yoshihiro
    Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University
  • SAMESHIMA Soichiro
    Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University
  • YAMAJI Katsuhiko
    Fuel Cell Materials Group, Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST)

Abstract

<p>A solid oxide fuel cell with an yttria-stabilized zirconia (YSZ) electrolyte, Ni–YSZ anode and Ru–YSZ cathode was fabricated to measure the cell performance at 500–800°C using a H2, CO or CO–H2O fuel and air oxidant. The terminal voltage drop at a larger current density was due to the overpotential at the electrodes. A part of CO fuel was electrochemically oxidized to produce an electric power and some fractions of CO fuel were decomposed to form CO2 gas and solid carbon (disproportionation reaction, 2CO → CO2 + C). In the CO–H2O fuel, electrochemical oxidation of a CO fuel, CO disproportionation, the water–gas shift reaction (CO + H2O → H2 + CO2) and oxidation of deposited carbon (C + H2O → H2 + CO) proceeded in the anode. It is possible to produce an electric power and a H2 fuel at the same time during the operation of a SOFC using a CO–H2O fuel.</p>

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