材料科学
光致发光
X射线光电子能谱
光催化
光降解
三元运算
量子点
可见光谱
载流子
异质结
纳米技术
光化学
化学工程
光电子学
催化作用
化学
工程类
生物化学
计算机科学
程序设计语言
作者
Tianyu Zhao,Zipeng Xing,Ziyuan Xiu,Zhenzi Li,Shilin Yang,Wei Zhou
标识
DOI:10.1021/acsami.8b21131
摘要
Oxygen-doped MoS2 nanospheres/CdS quantum dots/g-C3N4 nanosheets are synthetized through hydrothermal and chemical bath deposition–calcination processes. The prepared materials are characterized by X-ray diffraction transient-state photoluminescence spectra, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical experiment. These results show that the ternary composite material has longer lifetime of photogenerated carriers and more active sites, thereby enhancing photocatalytic performance. CdS quantum dots act as a bridge between the intermediate transport charges in the ternary composite. The oxygen defect engineering prolongs the lifetime of carriers obviously, which is confirmed by transient-state photoluminescence. Moreover, the photocatalytic H2 evolution and photodegradation of bisphenol A for MoS2/CdS/g-C3N4 is up to 956 μmol h–1 g–1 and 95.2% under visible-light irradiation, respectively. Furthermore, excellent photocatalytic activity can be ascribed to the synergistic effect of defect engineering and formation of ternary heterostructures, which is with broad-spectrum response, longer lifetime of photo-induced electron–holes, and more surface active sites.
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