Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 268, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118739
Keywords
Bifunctional composite cocatalyst; MoNi@MoO2; g-C3N4; Photocatalytic; H(2)evolution
Funding
- National Natural Science Foundation of China [51404143, 21571112, 51572136, 51772162]
- Taishan Scholar Foundation
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It is essential to construct bifunctional composite cocatalysts with earth-abundant metals for efficient transfer and separation of charge carriers, thus leading to the development of a photocatalyst with high H-2 evolution activity. Herein, MoNi@MoO2 composite cocatalysts were prepared by annealing Ni-doped Mo-MOF, and then decorating with g-C3N4 by grinding. The obtained MoNi@MoO2-8 %/g-C3N4 photocatalyst exhibited an optimum H-2 evolution rate of as high as 1.359 mmol g(-1) h(-1), 6.0 and 3.7 times than those of Ni/g-C3N4 and MoO2-8 %/g-C3N4, respectively. This improved activity can be ascribed to the bifunctional roles of MoNi@MoO2 and synergy between MoNi and MoO2. MoO2 acts as a reservoir to store electrons from g-C3N4; MoNi acts as surface-active sites to trap electrons from MoO2 and increase the proton reduction kinetics. This study would promote the development of other high-efficiency bifunctional cocatalysts to increase the photocatalytic H-2 evolution performance.
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