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The Cr-doped Ba 2 In 2 O 5 /In 2 O 3 (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 H 2 evolution from aqueous CH 3 OH 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 H 2 evolution rate in comparison with individual materials. The overall band structure, charge carrier excitation, separation, and transportation and the redox reactions for H 2 and O 2 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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Wang et al. (2005) studied this question.
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