Role of the Oxide Film formed on the Surf ace of Molten Aluminum as a Membrane for Chemical Pumping of Hydrogen

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  • FUKATSU Norihiko
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • KURITA Noriaki
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • ISHIHARA Naoyuki
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • OKABAYASHI Nariyuki
    Hamamatsu Plant, Ahresty Corporation
  • OHASHI Teruo
    Department of Materials Science and Engineering, Nagoya Institute of Technology

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  • Role of the Oxide Film Formed on the Surface of Molten Alminum as a Membrane for Chemical Pumping of hydrogen

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Abstract

<p>The properties of the oxide film formed on the surface of the aluminum as a chemical potential barrier separating the melt and the oxidizing atmosphere were investigated from the electrochemical point of view. The emf generated across the film was measured under various potential conditions and analyzed theoretically considering that the oxide film works as the solid electrolyte having a certain amount of proton and oxide ion conductivity. The emf was found to coincide with the value expected for pure proton conductor but considerably lower than that estimated for pure oxide ion conductor. This phenomenon is explained by the fact that the high hydrogen potential in the molten metal is sustained by the "chemical polarization" mechanism induced by the extremely large potential difference of oxygen between the inside and the outside of the film.</p>

Journal

  • Electrochemistry

    Electrochemistry 68 (9), 709-712, 2000-09-05

    The Electrochemical Society of Japan

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