期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 653, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129991
关键词
Photocatalytic hydrogen production; Z-scheme; Heterojunction; ZIF-67
资金
- Research Project of Education Ministry of Heilongjiang Province of China [135409101]
- College Students' Innovation and Entrepreneurship Training Program [202110232006]
This study successfully prepared a novel Z-scheme 2D-ZnIn2S4/NiCoP heterojunction by coupling NiCoP derived from ZIF-67 with 2D-ZnIn2S4 lamellae. The Z-scheme structure of ZnIn2S4/NiCoP could suppress the recombination of photogenerated electron-hole pairs and enhance the photocatalytic hydrogen production. The enhanced performance is attributed to the avoidance of agglomeration, increased active sites, shortened transmission distance, and inhibition of recombination.
Z-scheme photocatalytic heterojunction is considered as an effective strategy to promote the photogenerated electron-hole separation for improving the efficiency of photocatalytic hydrogen precipitation from splitting water significantly. Herein, a novel Z-scheme 2D-ZnIn2S4/NiCoP heterojunction is successfully prepared by coupling NiCoP derived from ZIF-67 through phosphating treatment with 2D-ZnIn2S4 lamellae via a facile hydrothermal method. The Z-scheme heterostructure of ZnIn2S4/NiCoP could suppress the recombination-rate of photogenerated electron-hole pairs and enhance the visible-light-driven photocatalytic hydrogen production. As a result, the hydrogen production rate of 2D-ZnIn2S4/NiCoP (10 wt% ZnIn2S4) increase to 5098.12 mu mol g(-1) h(-1) significantly with an apparent quantum yield (AQY) of 5.24% at 420 nm, which is 3.07 times than that of bare ZnIn2S4. The enhancement of photocatalytic performance is attributed to the following issues: 2D-ZnIn2S4 could avoid the agglomeration of tiny ZnIn2S4, exposing more active sites and shortening the transmission distance of photogenerated carries; the formation of Z-scheme heterostructure could promote the separation of photogenerated electron-hole pairs; the unique hollow structure of NiCoP derived from ZIF-67 could inhibit the recombination of the photogenerated electron-hole. Overall, this work could provide a new idea for designing and preparing of visible-light-driven photocatalysts with high efficiency for photocatalytic hydrogen production.
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