期刊
APPLIED SURFACE SCIENCE
卷 447, 期 -, 页码 783-794出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.04.048
关键词
Z-scheme heterojunction; Cd0.5Zn0.5S; g-C3N4; Reduced graphene oxide; Photocatalytic hydrogen evolution
类别
资金
- National Natural Science Foundation of China [21476183, 21676213, 51372201]
- China Postdoctoral Science Foundation [2016M600809]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM2026]
A novel reduced graphene oxide (RGO)-supported Cd0.5Zn0.5S/g-C3N4 Z-scheme heterojunctions has been successfully fabricated via a two-step method for enhanced photocatalytic hydrogen generation. The photocatalytic water splitting rate of the RGO-supported Cd0.5Zn0.5S/g-C3N4-40% composite can reach 39.24 mmol.g(-1).h(-1) (lambda = 420 nm, QE = 37.88%) without noble metal co-catalyst, which is 8.1 and 48.4 times with respect to pure Cd0.5Zn0.5S and g-C3N4. The enhanced photocatalytic hydrogen evolution performance can be ascribed to the synergistic effect between Cd0.5Zn0.5S nanospheres and g-C3N4 nanosheets in the existence of RGO, which plays a decisive role in the ternary system by acting as a mediator of carriers between the two semiconductors. Photoluminescence spectroscopy and transient photocurrent curves demonstrate that the separation efficiency of photo-generated carriers is significantly improved because of the Z-scheme heterojunction, which is demonstrated by the hydroxyl radical experiment. Besides, the photo-stability of the RGO-supported Cd0.5Zn0.5S/g-C3N4 -40% was also investigated. (C) 2018 Elsevier B.V. All rights reserved.
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