Abstract
Non-noble-metallic Ni2P modified BiOBr with oxygen vacancy (OV) was synthesized by solvothermal method to construct novel OV-BiOBr/Ni2P nanoheterojunction. Compared with OV-BiOBr, the photoelectrochemical hydrogen evolution of OV-BiOBr/Ni2P was significantly improved. OV-BiOBr/Ni2P-2% showed the best hydrogen evolution rate of 455.34 μmol·cm−2·h−1 without sacrificial agent, which was 5.94 times that of OV-BiOBr and 12.88 times that of pristine BiOBr. It was found that an appropriate amount of Ni2P loading enabled the closely contacted OV-BiOBr/Ni2P to have an optimal OV concentration, which realized the rapid electron-hole separation, simultaneously, the successful loading of Ni2P can effectively enhance the light absorption capacity. The formation of Bi-O-P chemical bond and nanoheterojunctions jointly promote electron transfer and inhibit carrier recombination. Density functional theory (DFT) calculations find that the hydrogen adsorption free energy of OV-BiOBr/Ni2P heterojunction is the lowest in this system. This study will provide some guidance for efficient photoelectrochemical hydrogen evolution without sacrificial agent.
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