photocatalysts including Bi-based photocatalysts, [1] Co-based photocatalysts, [2] carbon nitride (C 3 N 4 ), [3] cadmium selenide (CdSe), and cadmium sulfide (CdS) [4] have been developed for utilizing sunlight efficiently. Among them, one of the most representative photocatalysts is CdS, which possesses high photosensitivity and excellent photocatalytic performance owing to its relatively narrow bandgap (E g = 2.2 eV) and appropriate band structure posi-
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