水素還元したTiO<SUB>2</SUB>高温酸化皮膜の光電位の溶液pH依存性

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  • 原 基
    秋田大学工学資源学部材料工学科

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タイトル別名
  • Solution-pH Dependence of Photo-Potential for Hydrogen-Reduced TiO<SUB>2</SUB> Film Formed by High Temperature Oxidation
  • 水素還元したTiO2高温酸化皮膜の光電位の溶液pH依存性
  • スイソ カンゲン シタ TiO2 コウオン サンカ ヒマク ノ ヒカリデンイ ノ ヨウエキ pH イゾンセイ

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The solution-pH dependence of photo-potentials generated at rest potential for the TiO2 films formed by high-temperature oxidation and then reduced by a high-temperature hydrogen gas was investigated in a Na2SO4 solution. The effects of the oxygen gas contained in the solution and the temperature at the hydrogen reduction on this dependence of the TiO2 films were also investigated. The photo-potentials at rest potential for the TiO2 films were increased in the negative direction with an increase in solution pH. The photo-potentials at rest potential for the TiO2 films in the solution saturated with oxygen gas were larger in the negative direction than those in the solution deaerated by bubbling of hydrogen gas. An increase in temperature for the hydrogen reduction of the TiO2 films tended to increase the photo-potential of the film in the negative direction. Such a solution-pH dependence of photo-potentials at rest potential for the TiO2 film was explained from a change in degree of anodic polarization at rest potential with reference to the flatband potential, that is, the band bending for the TiO2 film on the basis of the energy-band model. The effects of the oxygen gas contained in the solution and the temperature for the hydrogen reduction on the photo-potentials of the films were also discussed.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 62 (12), 1123-1131, 1998

    公益社団法人 日本金属学会

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