Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 652, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129844
Keywords
Photocatalysis; ZnO@ZnScore-shell nanorods; H-2 evolution; Heterogeneous interface; Hydrothermal synthesis
Categories
Funding
- Natural Science Research Project of Jiangsu Higher Education Institutions [21KJA530004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The interest in noble-metal-free semiconductor photocatalysts for efficient H2 production under simulated sunlight is high among researchers. In this study, a novel ZnO@ZnS core-shell nanorod with varying ZnO core thicknesses was synthesized through partial vulcanization. The ZnO@ZnS (1:1) material exhibited the best photocatalytic performances, with hydrogen production rates significantly higher than other materials tested. The improved performance can be attributed to the distinctive internal structure of ZnO core and the homologous heterogeneous interface between ZnS and ZnO.
The noble-metal-free semiconductor photocatalysts for effective H2 production from H2O splitting under simu-lated sunlight has been interested greatly by researchers at present. In this work, a novel ZnO@ZnS core-shell nanorods with ZnO core of different thickness were synthesized firstly through partial vulcanization. The ZnO@ZnS (1:1) material exhibited the best photocatalytic performances with hydrogen production rates of 2.4 mmol g(-1 )h(-1), approximately 12.6, 3.3 and 1.5 times higher than those of ZnO, ZnO@ZnS (1:0.5) and ZnO@ZnS (1:1.5), respectively. Additionally, the corresponding apparent quantum efficiency (AQE) of the optimal material achieved 2.58% under simulated sunlight. The significantly improved photocatalytic hydrogen evolution performance can be attributed to two main reasons: the distinctive internal structure of ZnO core, the homologous heterogeneous interface between ZnS and ZnO. The former factor realizes light absorption to trigger the photocatalytic reaction, and the latter one greatly improves the separation and migration rate of photogenerated carriers.
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