Non-noble-metallic Ni2P nanoparticles modified OV-BiOBr with boosting photoelectrochemical hydrogen evolution without sacrificial agent

作者：Li, Xibao^*; Hu, Yan; Dong, Fan; Huang, Juntong; Han, Lu^*; Deng, Fang; Luo, Yidan; Xie, Yu; He, Chaozheng^*; Feng, Zhijun; Chen, Zhi; Zhu, Yongfa^*

来源：Applied Catalysis B: Environmental , 2023, 325: 122341.

DOI：10.1016/j.apcatb.2022.122341

• Photoelectrochemical
• Hydrogen evolution
• Oxygen vacancy BiOBr
• Ni2P
• Without sacrificial agent

Non-noble-metallic Ni2P modified BiOBr with oxygen vacancy (O-V) was synthesized by solvothermal method to construct novel O-V-BiOBr/Ni2P nanoheterojunction. Compared with O-V-BiOBr, the photoelectrochemical hydrogen evolution of O-V-BiOBr/Ni2P was significantly improved. O-V-BiOBr/Ni2P-2% showed the best hydrogen evolution rate of 455.34 mu mol.cm(-2).h(-1) without sacrificial agent, which was 5.94 times that of O-V-BiOBr and 12.88 times that of pristine BiOBr. It was found that an appropriate amount of Ni2P loading enabled the closely contacted O-V-BiOBr/Ni2P to have an optimal O-V 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 O-V-BiOBr/Ni2P heterojunction is the lowest in this system. This study will provide some guidance for efficient photoelectrochemical hydrogen evolution without sacrificial agent.

• 单位
  南昌航空大学; 电子科技大学; 清华大学