Phase junction CdS: High efficient and stable photocatalyst for hydrogen generation

被引:141
作者
Ai, Zizheng [1 ]
Zhao, Gang [1 ]
Zhong, Yueyao [1 ]
Shao, Yongliang [1 ]
Huang, Baibiao [1 ]
Wu, Yongzhong [1 ]
Hao, Xiaopeng [1 ]
机构
[1] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
CdS; Photocorrosion; Phase junction; Photocatalytic activity; VISIBLE-LIGHT; THIN-FILMS; NANOCRYSTALS; EVOLUTION; RAMAN; H-2; RECRYSTALLIZATION; TRANSFORMATION;
D O I
10.1016/j.apcatb.2017.09.002
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
CdS is a photocatalyst known for its desirable bandgap and availability but it is limited by photocorrosion and inefficiency issues in practical applications. According to band engineering theory, regulating the width of bonding region that exists between cubic phase and hexagonal phase, we design a suitable phase junction and achieve effective separation of electron-hole pairs. Thus, the problems caused by photocorrosion and phase exclusion can be resolved. The optimal photocatalytic activity of the prepared material is 4.9 mmol h(-1) g(-1) with 41.5% quantum efficiency at the wavelength of 420 nrn, Which is 60 times higher than that of the initial samples (cubic or hexagonal phase), and keeps high photocatalytic stability. This novel construction approach can be useful in designing ideal band structures and matching the phase bandgap of other binary sulfides.
引用
收藏
页码:179 / 186
页数:8
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