▎ 摘　　要

Photocatalytic production of hydrogen peroxide (H2O2) from earth-abundant water and O-2 is a desirable artificial photosynthesis for solar fuel production. A metal-free hybrid photocatalyst consisting of pyromellitic diimide-doped carbon nitride (g-C3N4/PDI), boron nitride (BN), and reduced graphene oxide (rGO) was prepared. The g-C3N4/PDI-BN-rGO catalyst, when photoirradiated in water with O-2 by visible light at room temperature, efficiently produces H2O2. The photoexcited g-C3N4/PDI moiety transfers the conduction band electrons to rGO, leading to selective production of H2O2 via two-electron reduction of O-2 on the rGO surface. In contrast, the valence-band holes photoformed on the g-C3N4/PDI moieties are transferred to BN, leading to efficient oxidation of water. The electron-hole separation enhanced by the incorporation of rGO and BN significantly suppresses the charge recombination and exhibits high photocatalytic activity. The solar-to-chemical conversion (SCC) efficiency for H2O2 production on the hybrid catalyst is 0.27%, which is higher than the highest efficiencies obtained by overall water splitting on powdered catalysts.