煅烧
异质结
材料科学
光催化
基质(水族馆)
化学工程
电子转移
纳米颗粒
催化作用
制氢
粒子(生态学)
磷
纳米技术
化学
光电子学
光化学
有机化学
冶金
地质学
工程类
海洋学
作者
Hongying Li,Haiming Gong,Zhiliang Jin
标识
DOI:10.1016/j.apcatb.2022.121166
摘要
Regulating the directional migration of photo-generated carriers is an important strategy for realising high-performance photocatalysts. In this work, nano-particle Ni2P and peanut-like BiVO4 were grown on a rhombic structure Ni-MOF-74 substrate. A composite catalyst Ni-MOF-74/BiVO4/P with excellent performance was prepared by the high-temperature calcination method. Phosphorus modification produces Ni2P as an electron-capture centre while maintaining the basic morphology of Ni-MOF-74, effectively avoiding the accumulation of nanoparticles. The Ni2P nanoparticles not only increase the number of active sites but also introduce negatively charged P that captures more protons for hydrogen evolution. After reasonable modification, the hydrogen production of the Ni-MOF-74/BiVO4/P reached 245.4 μmol in 5 h, 23 times that of pure Ni-MOF-74. An S-scheme heterojunction between Ni-MOF-74 and BiVO4 achieves the directional transfer of carriers thereby inhibiting the recombination of electron-hole pairs. The band structure and density of states of Ni2P and BiVO4 were determined in density functional calculations. This work provides a new way for the regulation of the carrier-behaviour in photocatalysts.
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