“…They have been widely used in solar cells, photocatalysis, and hydrogen evolution reactions. [30,31] CTSs have been combined with graphene oxide (GO) or reducing-graphene oxide (rGO), [32,33] nanotitanium dioxide (TiO 2 ), [34] amorphous carbon (C), [35] Keggin-type polyoxometalate (POM), [36] and protonated graphitic carbon nitride (PCN), [37] to construct related heterojunctions or heterogeneous composites. These heterojunctions and composites showed excellent photocatalytic activities in the photodegradation of organic dyes or photocatalytic H 2 generation.…”