期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 564, 期 -, 页码 322-332出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.12.111
关键词
ZnO hollow microsphere; rGO nanosheet; H-2 evolution; Photocatalytic mechanism; Microwave-assisted synthesis
资金
- National Natural Science Foundation of China [51672113]
- Natural Science Foundation of Top Talent of SZTU [2018010804]
- Science and Technology Foundation for Excellent Creative Research Group of Hubei Provincial Department of Education [T201810, 201810513100]
Improving efficient solar light utilization, facilitating charge transportation and reducing electron-hole recombination, are the three major challenges in photocatalysis, and numerous interests have been devoted into overcoming these issues for obtaining high performance photocatalysts. Herein, ZnO hollow microspheres/reduced graphene oxide (ZnO/rGO) composites were constructed as a high performance photocatalyst for splitting water into H-2 via a one-step microwave-assisted solvothermal process. The optimized ZnO/rGO nanocomposite (the mass ratio of GO to ZnO is 1%) reached a maximum H-2 evolution rate of 648.1 mu mol/h/g without using noble metal as cocatalyst, which exhibiting similar to 2.3-fold enhancement as compared to that of the bare ZnO. This significant improvement was primarily attributed to great light-harvesting capacity and the efficient charge carrier separation and transfer. The detailed characterization of PL and EIS revealed that, in the ZnO/rGO composite, the rGO nanosheets played important roles in promoting the charge carrier separation and transfer, which therefore resulting in an enhanced activity in H-2 evolution. Our present observations provide a valuable methodology for exploring novel high performance photocatalyst, especially in graphene-based inorganic hybrid systems. (C) 2019 Elsevier Inc. All rights reserved.
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