4-2-1 二段階水分解反応を用いるソーラー水素生産用反応性セラミックスの開発(4-2 太陽熱発電・水素製造2,Session 4 新エネルギー,研究発表)

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In the present paper, different types of metal doped ceria CeO_2-MO_x (M=Sc, Y, Dy, Zr and Hf) with fluorite structures have been prepared with a complex polymerization method. The O_2-releasing potential of prepared samples was evaluated at 1773 K for two-step water splitting process. The partially oxygen defected CeO_2-MO_<1.5> mixed oxides (M=Sc^<3+>, Y^<3+> and Dy^<3+>) exhibited an enhancement of the O_2 evolution due to the crystal-chemical effect that cation with smaller ionic radius (Sc^<3+>, Y^<3+> and Dy^<3+>) mitigate the volume expansion of crystal lattice resulted in the reduction of Ce^<4+> with smaller ionic radius into Ce^<3+> with larger ionic radius. The CeO_2-MO_2 (M=Zr^<4+> and Hf^<4+>) produced larger amount of O_2 than that for CeO_2-MO_<1.5> mixed oxides, since CeO_2-MO_2 has no oxygen vacancy. While the ionic radii of Zr^<4+> and Hf^<4+> are almost equal, the higher O_2-releasing reactivity of Ce_<0.9>Hf_<0.1>O_2 than that of Ce_<0.9>Zr_<0.1>O_2 is explained in terms of iconicity of M-O bond.
一般社団法人日本エネルギー学会の論文
2010-08-02