Enhanced Photocatalytic Water Splitting of Hydrous LiCa2Ta3O10 Prepared by Hydrothermal Treatment

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  • Mitsuyama Tomohiro
    Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University
  • Tsutsumi Akiko
    Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University
  • Hata Takakazu
    Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University
  • Ikeue Keita
    Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University
  • Machida Masato
    Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University

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Hydration behavior of A′Ca2Ta3O10 (A′ = Cs, Rb, K, Na, and Li) was studied focusing on the photocatalytic activity for overall water splitting under UV-irradiation. Interlayer hydration was only observed for A′ = Na and Li, which possess a large enthalpy of hydration (ΔHh°). A Na phase readily yielded a stable hydrous phase even at ambient temperature, whereas a Li phase required hydrothermal treatment at ≥160 °C. This is consistent with the fact that the Na phase kept its space group (I4⁄mmm) unchanged during hydration, whereas the Li phase changed from I4⁄mmm to P4⁄mmm. Hydration of the Li phase doubled the rate of photocatalytic gas evolution (≥700 μmol-H2 h−1) in the presence of 0.5 wt % Ni load, which was the highest in the series of A′Ca2Ta3O10. It was demonstrated that the hydrated interlayer is an efficient structural modification to enhance the photocatalytic activity of the ion-exchangeable layered perovskite-type oxides.

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