In the present paper, different types of metal doped ceria CeO2-MOx (M = Sc, Y, Dy, Zr and Hf) with fluorite structures have been prepared with a complex polymerization method. The O2-releasing potential of prepared samples was evaluated at 1773 K for two-step water splitting process. The partially oxygen defected CeO2-MO1.5 mixed oxides (M = Sc3+, Y3+ and Dy3+) exhibited an enhancement of the O2 evolution due to the crystal-chemical effect that cation with smaller ionic radius (Sc3+, Y3+ and Dy3+) mitigate the volume expansion of crystal lattice resulted in the reduction of Ce4+ with smaller ionic radius into Ce3+ with larger ionic radius. The CeO2-MO2 (M = Zr4+ and Hf4+) produced larger amount of O2 than that for CeO2-MO1.5 mixed oxides, since CeO2-MO2 has no oxygen vacancy. While the ionic radii of Zr4+ and Hf4+ are almost equal, the higher O2-releasing reactivity of Ce0.9Hf0.1O2 than that of Ce0.9Zr0.1O2 is explained in terms of ionicity of M-O bond. Thus, it was found that both ionic radius and ionicity play important role in the O2-releasing reaction.
- Advanced Energy Systems Division and Solar Energy Division
O2 Releasing Reactivity of Ceria-Based Reactive Ceramics on Irradiation of Concentrated Solar Beam for Solar Hydrogen Production
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Tada, M, Ishihara, T, Kaneko, H, & Tamaura, Y. "O2 Releasing Reactivity of Ceria-Based Reactive Ceramics on Irradiation of Concentrated Solar Beam for Solar Hydrogen Production." Proceedings of the ASME 2010 4th International Conference on Energy Sustainability. ASME 2010 4th International Conference on Energy Sustainability, Volume 2. Phoenix, Arizona, USA. May 17–22, 2010. pp. 163-167. ASME. https://doi.org/10.1115/ES2010-90460
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