Abstract
Photoelectrochemical water splitting is one of the promising methods to generate hydrogen fuels. Designing photocatalysts for accelerating four-electron transfer water oxidation is necessary to improve photoelectrochemical water splitting. Bismuth vanadate is one of the efficient photocatalysts for water oxidation, but the short diffusion length limits its photocatalytic ability. This work first proposes synthesis of bismuth sulfide/bismuth vanadate nanorod array on conducting glass via solution method and hydrothermal reaction to enhance visible-light absorption and provide efficient charge-transfer with type II heterojunction and one-dimensional transfer path. Bismuth sulfide coverage on bismuth vanadate nanorod array is simply tuned by varying thiourea amounts in hydrothermal solution. Higher photocurrent density of 1.43 mA/cm2 are obtained for bismuth sulfide/bismuth vanadate electrode than that for bismuth vanadate electrode (0.25 mA/cm2) at 1.23 V versus reversible hydrogen electrode, measured under...
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