Stable Power Generation Using a Solid Oxide Fuel Cell with a Ni/Gd-doped CeO2 Cermet Anode in 100% Dry-CH4 Fuel Based on the Anode Reaction Mechanism.

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  • Ihara Manabu
    nstitute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Matsuda Keisuke
    nstitute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Yokoyama Chiaki
    nstitute of Multidisciplinary Research for Advanced Materials, Tohoku University

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Other Title
  • 新しい電池の開発およびその関連技術　　純ドライメタン燃料によるニッケル／ガドリニアドープセリア燃料極を用いた固体酸化物燃料電池の安定発電とその電極反応機構の検討

Abstract

Stable power generation from a solid oxide fuel cell (SOFC) with a Ni/Gd-doped CeO2 Cermet (GDC) anode in 100% dry-methane (CH4) fuel was achieved at a maximum power density of 170 mW/cm2 at 900° C. The SOFC did not degrade even after 120 h of operation. The DC polarization of the Ni/GDC anode in hydrogen (H2) fuel and in 4.5% dry-methane fuel was measured by the current interruption method and then compared with those of Ni/YSZ, Pt/YSZ and Pt anodes. The apparent reaction orders of the oxygen activity for Ni/GDC anodes in both hydrogen fuel and 4.5% dry-methane fuel were smaller than those for Ni/YSZ, Pt/YSZ, and Pt anodes. Based on the previously proposed anode reaction mechanism for Ni/YSZ and Pt/YSZ anodes in hydrogen fuel and 4.5% dry-methane fuel, the stable power generation of the SOFC with the Ni/GDC anode in 100% dry-methane fuel was probably due to the high equilibrium constant between the oxygen in YSZ and the oxygen on the three-phase boundary on the anodes.

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