The spatial separation and transport of photogenerated charge carriers is crucial in building an efficient photocatalyst for solar energy conversion into chemical energy. A step-scheme CdS/MnO x -BiVO 4 photocatalyst was synthesized by spatial deposition of MnO x and one-dimensional (1D) CdS nanowires on a three-dimensional (3D) decahedron BiVO 4 surface. The photocatalytic activity of CdS/MnO x -BiVO 4 for the overall water-splitting reaction was investigated without sacrificial reagent under visible light irradiation. The synthesized photocatalysts were thoroughly analyzed using high-end characterization techniques. The 5CdS/MnO x -BiVO 4 exhibited the highest H 2 and O 2 production rates of 1.01 and 0.51 mmol g –1 h –1, respectively, with an apparent quantum yield of 11.3% in the absence of any sacrificial reagent. The excellent photoactivity is due to the presence of oxygen vacancies along with effective charge separation/transfer properties and strong interaction of cocatalysts (MnO x and Pt) with the photocatalysts (BiVO 4 and CdS) in the 5CdS/MnO x -BiVO 4 heterojunction. The significance of the presence of MnO x and Pt cocatalysts on the selective facets of BiVO 4 for efficient overall water splitting reaction is highlighted in this work.
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Gogoi et al. (2021) studied this question.
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