Two-step Water Splitting Reaction with Ce-Zr Oxide System for Solar Hydrogen Production

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  • Taku Shunpei
    Research Center for Carbon Recycling & Energy, Tokyo Institute of Technology
  • Kaneko Hiroshi
    Research Center for Carbon Recycling & Energy, Tokyo Institute of Technology
  • Tamaura Yutaka
    Research Center for Carbon Recycling & Energy, Tokyo Institute of Technology

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Other Title
  • Ce-Zr系酸化物を用いた二段階水分解反応によるソーラー水素生産
  • Ce Zrケイ サンカブツ オ モチイタ 2ダンカイ ミズブンカイ ハンノウ ニ ヨル ソーラー スイソ セイサン

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Abstract

Two-step water splitting reaction with the reactive ceramics of cerium dioxide (CeO2) and zirconium dioxide (ZrO2) solid solutions (Ce-Zr system) which can be applied for solar hydrogen production using concentrated solar thermal energy has been studied. These reactive ceramics are high-temperature resistance and high ion conductivity and the reaction proceeds at high temperature (>1773K) and the high-flux energy (1000-3000 kW/m2) is sufficiently absorbed. The samples of Ce-Zr system were prepared by oxalate coprecipitation method (The molar ratio of Ce : Zr were adjusted 100 : 0, 80 : 20 and 60 : 40.) and by polymerized complex method (Ce : Zr was adjusted 60 : 40). These samples prepared by oxalate coprecipitation method were cubic-main system and the sample prepared by polymerized complex method was tetragonal system. No H2-generation reaction proceeds with tetragonal system at 673-873K, but with cubic-main system, indicating that the reactivity of the two-step water splitting reaction with Ce-Zr system chemical composition of Ce60Zr40 is difficult depending on the crystal system. The reactivity of the two-step water splitting process is enhanced and the O2-releasing temperature is lowered by doping ZrO2 in CeO2. The amounts of H2 evolved in the H2-generation reaction with Ce60Zr40 (cubic-main system prepared by oxalate coprecipitation method) is less than those of Ce100 and Ce80Zr20 at 1473-1573K, but more than those at 1773K. The reaction mechanism on the difference of those H2-generation reactions was investigated.

Journal

  • Eco-Engineering

    Eco-Engineering 19 (4), 255-262, 2007

    The Society of Eco-Engineering

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