“…Since the pioneering work reported on TiO 2 electrode in 1972, 1 researchers have studied a series of catalysts ranging from metal oxides to other materials, such as metal sulfides, 2,3 non‐metal semiconductors (e.g., C 3 N 4 and graphene), 4,5 and complex catalysts 6–9 . As one of the important metal sulfides, CdS have attracted widely attention due to its relatively simple chemical structure, good light absorption and suitable band positions for photocatalytic redox reaction 10,11 . Although it has board photocatalytic application in H 2 generation, CO 2 reduction, and selective organic synthesis, the high recombination rate of photogenerated charge carriers (electrons and holes) is still a difficult problem, which results to a low photocatalytic performance 12,13 …”