“…Sustainable H 2 production by photocatalysis is a green and environmentally friendly candidate to meet the global energy shortage. − However, single photocatalysts still suffers from serious recombination of photogenerated charges, which severely impedes further practical applications. − To solve the above problems and realize efficient photocatalytic activity, different strategies have been explored involving construction of a heterojunction, , cocatalyst modification, , and morphology engineering. , Among them, integrating cocatalysts has been proven to be a versatile means to dramatically boost the photocatalytic activity, which not only can expedite the separation of photoexcited carriers but also minimize the activation energy of H 2 production. − Particularly, platinum group metals have been widely used to enhance the activity of various photocatalytic materials (including TiO 2 , CdS, and g-C 3 N 4 ), , but their exorbitant price and low abundance seriously limit the commercialization process. − Therefore, it is very essential to further explore cheap and highly active hydrogen generation cocatalysts for signally improving the efficiency of water splitting. − …”