Visible-Light-Sensitive TiO2 Photocatalysts Initiated by Interfacial Charge Transfer

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  • IRIE Hiroshi
    Clean Energy Research Center, University of Yamanashi
  • HASHIMOTO Kazuhito
    Graduate School of Engineering, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo

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  • 界面電荷移動機構に基づく酸化チタン光触媒の可視光応答化
  • カイメン デンカ イドウ キコウ ニ モトズク サンカ チタン ヒカリ ショクバイ ノ カシコウ オウトウカ

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Abstract

We have designed and fabricated TiO2 photocatalysts sensitive to visible light, after the suggestions made in the literature as to the photo-induced interfacial charge transfer between a semiconductor and an adsorbed molecular species. Among them, Cu (II)/TiO2 decomposed 2-propanol to CO2 via acetone under visible light (>400 nm) with a high quantum efficiency of 8.8%. We speculate that the high performance of the photocatalyst is derived from the photo-produced holes that are generated in the valence band of TiO2 and contribute to the oxidative decomposition of 2-propanol, and the catalytic reduction of oxygen (presumably multi-electron reduction) by photo-produced Cu (I) species on TiO2.

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