Abstract
Hydrothermal synthesis of BiVO4 at pH 12 yields amorphous pale yellow nanoparticles and that at pH 5 provides crystalline greenish yellow nanoparticles. The solid state impedance spectrum of crystalline BiVO4 is quasi-semicircular and the amorphous BiVO4 exhibits a quasi-linear relationship between ZIm and ZRe. The band gap of amorphous BiVO4 is larger than that of crystalline BiVO4. The band gap emission of amorphous BiVO4 is stronger than that of crystalline BiVO4. The amorphous BiVO4 nanoparticles exhibit larger visible light-photocatalytic activity than BiVO4 nanocrystals.
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