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Photocatalytic Water Splitting with the Cr-Doped Ba2In2O5/In2O3 Composite Oxide Semiconductors

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journal contribution
posted on 14.06.2005, 00:00 authored by Defa Wang, Zhigang Zou, Jinhua Ye
The Cr-doped Ba2In2O5/In2O3 (C−BIO) oxide semiconductors synthesized by a solid-state reaction method were found to be a novel composite photocatalyst system with enhanced activity for water splitting. The C−BIO powder samples were characterized with X-ray diffraction (XRD), UV−vis diffuse reflectance spectrometry, energy dispersive spectrometry (EDS), and high-resolution transmission electron microscopy (HRTEM). The photocatalytic activities of Pt- or NiO-loaded C−BIO and individual precursor materials were evaluated by H2 evolution from aqueous CH3OH solution under visible light and by pure water splitting under UV light irradiation, respectively. It was found that the composite C−BIO showed a higher H2 evolution rate in comparison with individual materials. The overall band structure, charge carrier excitation, separation, and transportation and the redox reactions for H2 and O2 evolution in the C−BIO system are discussed in relation to the photophysical and photocatalytic properties, and some guidelines are suggested for designing efficient composite semiconductor photocatalysts for water splitting.

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