Z-scheme based CdS/CdWO4 heterojunction visible light photocatalyst for dye degradation and hydrogen evolution

被引：129
作者：
Cui, Haojie [1 ]
Li, Beibei [1 ]
Li, Zhongyu [1 ,2 ,3 ]
Li, Xiazhang [2 ]
Xu, Song [2 ]
机构：
[1] Changzhou Univ, Sch Environm & Safety Engn, Changzhou 213164, Peoples R China
[2] Changzhou Univ, Sch Petrochem Engn, Jiangsu Key Lab Adv Catalyt Mat & Technol, Changzhou 213164, Peoples R China
[3] Changzhou Univ, Adv Catalysis & Green Mfg Collaborat Innovat Ctr, Changzhou 213164, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2018年 / 455卷
基金：
中国国家自然科学基金;
关键词：
CdS/CdWO4; Nanorods; Hydrogen evolution; Z-scheme; Visible light; SITU SOLVOTHERMAL METHOD; RAMAN-SPECTROSCOPY; OXYGEN VACANCIES; CDS; WATER; TIO2; CONSTRUCTION; PERFORMANCE; COMPOSITES; MORPHOLOGY;
D O I：
10.1016/j.apsusc.2018.06.054
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this study, the CdS/CdWO4 composites was synthesized by three steps as the visible-light-driven photocatalyst to achieve the remarkable enhanced photocatalytic hydrogen (H-2) production activity (about 2400 mu mol/h/g) and excellent photodegradation activity (97%) of malachite green (MG) in 100 min. Compared with pure CdS, 0.5-CdS/CdWO4 composites exhibit 3-fold higher photocurrent density in photocurrent response experiment and smaller charge-transfer resistance in electrochemical impedance spectroscopy (EIS) which manifested the efficacious separation of photo-generated charges. Radical trapping experiments and XPS further demonstrate the transfer of photo-generated charges followed Z-scheme system. This work presents a new design of CdS/CdWO4 composites in formation of Z-scheme heterojunction. Based on the outcomes of UV-vis spectra and Mott-Schottky plots, the photocatalytic mechanism of H-2 production and MG photodegradation over CdS/CdWO4 composites under visible-light irradiation was proposed.
引用
收藏
页码：831 / 840
页数：10
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