Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39331-39340Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c09650
Keywords
photocatalytic H-2 evolution; NiFe-LDH/Zn0.5Cd0.5S; energy conversion; direct Z-scheme photocatalyst
Funding
- National Basic Research Program of China (973 Program) [2009CB939705]
- National Natural Science Foundation of China [11174227]
- Chinese Universities Scientific Fund
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This study constructed a direct Z-scheme heterojunction using NiFe-LDH/Zn0.5Cd0.5S composite material, effectively separating photogenerated carriers and increasing photocatalytic hydrogen evolution efficiency.
It is of great significance to construct heterojunctions using industrially produced co-catalysts. The direct Z-scheme composite photocatalyst provides an effective separation of photogenerated carriers. Herein, a kind of novel 2D/3D direct Z-scheme NiFe-LDH/Zn0.5Cd0.5S is prepared. Compared with fresh catalysts, the NiFe-layered double hydroxide (LDH)/Zn0.5Cd0.5S composite exhibits advantages including excellent visible light response ability and photoelectric performance and improved H-2 evolution rate by 11.6 times. Combining with theoretical calculations, ESR, XPS, and experimental results, the direct Z-scheme mechanism of the photocatalytic reaction is proposed. There is a channel for electron transfer between Zn0.5Cd0.5S and NiFe-LDH, and the electrons of Zn0.5Cd0.5S directly combine with the valence band holes of NiFe-LDH. Finally, the electrons remaining on NiFe-LDH can reduce H+ to generate H-2. This process effectively achieves separation of photogenerated carriers and increases photocatalytic H-2 evolution.
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