title: Theoretical insight into the electronic, optical and photocatalytic properties of InMO4 (M = V, Nb, Ta) photocatalysts.
abstract: The electronic and optical properties of InMO(4) (M = V, Nb, Ta) photocatalysts are studied using first-principles calculations. For all InMO(4), the calculated band gaps are larger than the measured optical gaps, indicating the existence of sub-bandgap transitions. Impurity states and excitons are considered to interpret the characteristic absorption onsets in the measured UV-visible diffuse reflection spectra. The novel visible-light-active water-splitting photocatalytic properties of InMO(4) are related to the sub-bandgap transitions. Correlation between the impurity states and the photocatalytic activities is discussed for InMO(4)via the conventional mechanism of photocatalytic water-splitting on semiconductors. An excitonic mechanism analogous to Photosystem II in plant photosynthesis is also proposed for the photocatalytic water-splitting process on InMO(4).
authors.affiliation: Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China. liguoling@dicp.ac.cn
authors.forename: Guo-Ling
authors.initials: GL
authors.lastname: Li
authors.forename: Zhen
authors.initials: Z
authors.lastname: Yin