Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 307, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121166
Keywords
Photocatalysis; S-scheme heterojunction; Ni-MOF-74; BiVO4 ; DFT; Hydrogen production
Funding
- Chinese National Natural Science Foundation [22062001]
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This research successfully prepared a composite catalyst Ni-MOF-74/BiVO4/P with excellent performance by modification, achieving the directional migration of photo-generated carriers and increasing the hydrogen production.
Regulating the directional migration of photo-generated carriers is an important strategy for realising highperformance 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 mu mol 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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