紀要論文 Ni - Y0.08Zr0.92O2-δサーメット燃料極/ Y0.08Zr0.92O2-δ電解質 界面抵抗に及ぼす燃料ガス組成の影響

小倉, 知也

内容記述
 Fuels containing H2, CH4 and CO2 were supplied to a fuel electrode composed of Ni and yttriastabilized zirconia, Y0.08Zr0.92O2-δ (YSZ), in a solid oxide fuel cell. The interface resistance of the Ni-YSZ electrode/YSZ electrolyte was measured by AC impedance spectroscopy and the fraction of unused fuel was analyzed by gas chromatography. When 100% H2 was supplied to the Ni-YSZ electrode as a fuel, the interface resistance of the electrode/electrolyte and the fraction of unused fuel were almost constant independent of the operation time. On the other hand, the interface resistance of the electrode/electrolyte and the fraction of unused fuel were increased with increasing operating time, when fuels containing carbon, such as Ar-5%CH4, Ar-60%H2-30%CO2, were supplied to the fuel electrode. X-ray photoelectron spectroscopy suggested that carbon was adsorbed on Ni surface in a oxidized state, which disturbs adsorption of H2 or CH4 on the Ni surface.Key Words: SOFC, Anode, CO2, AC impedance
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