期刊
APPLIED SURFACE SCIENCE
卷 602, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154329
关键词
Carbon nitride; ZnxNi1-xSe; Photocatalysis; H-2 evolution; Urea synthesis
类别
资金
- National Natural Science Foundation of China [51272052, 50902040]
- Natural Science Foundation of Heilongjiang Province of China [LH2020B011, LH2019B006]
- Scientific Research Projects of Basic Scientific Research Operational Expenses of Heilongjiang provincial colleges and universities [2021-KYYWF-0171]
In this study, a novel ternary photocatalyst ZnxNi1-xSe/g-C3N4 was constructed by forming a NiSe/ZnSe heterostructure to effectively separate photocarriers and enhance the catalytic activity.
Promoting the separation and transfer of photocarries is very critical in designing an effective photocatalyst. In this study, a novel bimetal selenide ZnxNi1-xSe with NiSe/ZnSe heterostructure prepared by one-step selenization to construct ternary catalytic system NiSe/ZnSe/g-C3N4 (ZnxNi1-xSe/g-C3N4). Consequently, the photocatalytic activity of ZnxNi1-xSe/g-C3N4 is greatly enhanced and higher than that of binary ZnSe/g-C3N4 or NiSe/g-C3N4. The hydrogen production rate of 7 % Zn0.7Ni0.3Se/g-C3N4 reaches 410.15 mu mol h(-1) g(-1), which is 34 times of pure g-C3N4 and 1.5 times of 1 % Pt/g-C3N4. For urea synthesis, 10 % Zn0.7Ni0.3Se/g-C3N4 show the highest urea synthesis rate of 1.12 mu mol h(-1) g(-1), which is about 6 times of pure g-C3N4. The intrinsic mechanism analysis indicates that bimetal selenide NiSe/ZnSe heterojunction plays two roles in ZnxNi1-xSe/g-C3N4 system. Both ZnSe and g-C3N4 forms a type II heterojunction to effectively separate photocarriers. Meanwhile, NiSe provides hydrogen evolution active sites due to its smaller H adsorption free energy, making hydrogen more easily generated and released on it. The synergistic effect of ZnSe/g-C3N4 type II heterojunction and NiSe co-catalyst is more conducive to the separation and transfer of photocarries, thereby resulting in a remarkably enhanced activity. This work provides a unique construction method to design an effective ternary photocatalysts with a double stimulative effect.
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