Abstract
Epitaxial BiVO4 nanoislands and ITO–BiVO4 composite thin films were prepared on yttrium-stabilized zirconia (001) substrates by pulsed laser deposition. Structural characterization results indicated that the growth of ITO film followed the layer-by-layer mode and covered uniformly on the YSZ substrate and BiVO4 islands. The photocatalytic activities of ITO–BiVO4 composites were lower than bare BiVO4 islands, and decreased with the increase of thickness of deposited ITO films. Photocatalytic degradation experiments in anoxic solution showed that, photogenerated electrons in ITO–BiVO4 composites played a more important role in dye degradation than that in bare BiVO4. The complete coverage of ITO layer on BiVO4 nanoislands prevented the contact between photogenerated holes and RhB solution, leading to the accumulation of holes and the rapidly carrier recombination.
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