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Phosphorylation of NiAl-layered double hydroxide nanosheets as a novel cocatalyst for photocatalytic hydrogen evolution.
- Source :
-
International Journal of Hydrogen Energy . May2021, Vol. 46 Issue 36, p18977-18987. 11p. - Publication Year :
- 2021
-
Abstract
- In previous studies, it has been shown that phosphorus and phosphate can improve the conductivity, change the electronic structure, and accept electrons from catalysts. In this study, we obtained phosphorylated NiAl-layered double hydroxide (P-LDH) nanosheets and used them as a novel cocatalyst in photocatalytic hydrogen evolution. After assembly with g-C 3 N 4 via an in situ process, these noble-metal-free composite photocatalysts showed superior photocatalytic hydrogen evolution activity. It was also found that the efficiency of H 2 production on the optimal composite was 1.5 times that of Pt-modified g-C 3 N 4. Characterization of the photocatalysts revealed that the effects of P-LDH were different from those of other bimetallic LDHs, showing a lower overpotential and faster reaction kinetics of H 2 evolution. Moreover, it was found that P-LDH has a higher surface work function than that of g-C 3 N 4 , leading to the formation of an interfacial electric field from CN toward P-LDH. Therefore, modifying P-LDH can efficiently improve the interfacial charge transfer rate, suppress photogenerated charge recombination, and lower the surface overpotential of g-C 3 N 4. This study serves as guidance on the design of more effective cocatalysts for photocatalytic hydrogen evolution reactions. • Novel phosphorylated NiAl-layered double hydroxide nanosheets were synthesized. • The P-LDH can act as a cocatalyst for photocatalytic hydrogen production. • The formation and effects of P-LDH were studied and verified in detail. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 46
- Issue :
- 36
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 150296260
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2021.03.064