A BiVO/BiS composite comprising BiS nanowires on top of a BiVO film was prepared via hydrothermal reaction. Because additional Bi ions were not delivered during the reaction, BiVO served as the Bi ion source for the development of BiS. A detailed growth mechanism of the nanowire was elucidated by an analysis of the concentration gradient of Bi and S ions during the reaction. The growth was followed by the etching of BiVO to Bi and VO ions and regrowth to BiS, which resulted in the rapid evolution of nanowires on the BiVO substrate. The fabricated BiVO/BiSNW composite exhibited an improved photoelectrochemical activity compared to other BiS samples. The improved efficiency was mainly attributed to both improved charge separation and effective adhesion obtained by the growth.
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