Investigation of Cathode Dissolution in Molten Carbonate Fuel Cell

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  • KASAI Hidekazu
    Department of Fuel Cell, Ishikawajima-Harima Heavy Industry Co., Ltd.
  • SUZUKI Akira
    Department of Fuel Cell, Ishikawajima-Harima Heavy Industry Co., Ltd.
  • SATO Seiji
    Department of Fuel Cell, Ishikawajima-Harima Heavy Industry Co., Ltd.

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Other Title
  • 溶融炭酸塩型燃料電池のカソードの溶出挙動
  • ヨウユウ タンサンエンガタ ネンリョウ デンチ ノ カソード ノ ヨウシュツ

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Abstract

The dissolution of the cathode (in-site type NiO) in co-flow type molten carbonate fuel cells (MCFC) was investigated. The anode was made of Ni-10% Cr powder, and the electrolyte tile consisted of LiAlO2 and carbonate (Li/K=62/38) powder. These components were manufactured by a doctor-brade process. These cells were operated several times (500-4000h) at 650°C. The amount of dissolved Ni was estimated by chemical analysis. Deposited Ni particles were observed in the tile by the characteristic X-ray technique. These particles had two types of shape (grain and column). The content of Ni in the tile was higher near the gas inlet than that near the outlet. The dissolution rate of Ni depended on the CO2 partial pressure in cathode gas. The higher dissolution rate was observed at low er temperatures. This tendency might be caused by the equilibrium solubility of NiO in the carbonate. It is supposed that the fraction occupied by carbonate in the cathode′s pore had influences the NiO dissolution rate.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1988 (8), 1345-1350, 1988-08-10

    The Chemical Society of Japan

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