NiAl-LDH-Modified Core-Shell Rod-like ZnO@ZnS Heterostructures for Enhanced Photocatalytic Hydrogen Precipitation
JOURNAL OF PHYSICAL CHEMISTRY C(2023)
摘要
Photocatalytic hydrogen production technology is considered as an important approach to solve the problem of energy shortage. The ZnO@ZnS core-shell nanostructure can not only protect the nuclear material from chemical corrosion but also form heterojunctions to improve the catalytic performance; however, the photocatalysis of ZnO@ZnS only responds to the UV region, and its solar light utilization is low. In this paper, ZnO@ ZnS rods were prepared and formed covalent bonding in the interface because of the in situ sulfidation process. Subsequently, the two-dimensional NiAl-LDH with positive charge was grown on the surface of ZnO@ZnS by electrostatic self-assembly due to the presence of negatively charged ZnS. So, the prepared ZnO@ZnS@NiAl-LDH composites have the stable interface structure. We compared the hydrogen production efficiency of ZnO, ZnO@ZnS, and ZnO@ZnS@NiAl-LDH under simulated sunlight. The maximum hydrogen production efficiency of the ZnO@ZnS@NiAl-LDH composite was 866.35 mu mol g-1 h-1, which was 3.96 times higher than that of ZnO@ZnS (218.41 mu mol g-1 h-1), and the sample also had a good stability and recyclability according to the results of the cycling test of photocatalytic H2 generation. Due to the presence of UV-responsive ZnO@ZnS and visible-light-responsive NiAl-LDH, ZnO@ZnS@NiAl-LDH can effectively utilize the entire solar spectrum. The interface structure affected the electron transfer rates so that the synergistic interaction between rod-shaped ZnO@ZnS and layered NiAl-LDH could improve the electron-hole separation rate and the transport rate of photogenerated charge pairs, thus optimizing the photocatalytic performance. This study provides new ideas for the research of ZnO-based materials as photocatalysts.
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关键词
zno@zns,hydrogen,heterostructures,nial-ldh-modified,rod-like
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