光催化
材料科学
异质结
纳米棒
贵金属
带隙
金属
可见光谱
电化学
硫化物
相(物质)
化学工程
半导体
制氢
光电子学
氢
纳米技术
催化作用
物理化学
化学
电极
冶金
有机化学
工程类
作者
Nan Li,Jiaojiao Wu,Yanting Lu,Zhijie Zhao,Hechuan Zhang,Xitao Li,Yan‐Zhen Zheng,Xia Tao
标识
DOI:10.1016/j.apcatb.2018.07.002
摘要
Low-cost and efficient noble-metal-free cocatalysts on semiconductors are highly desirable for visible-light photocatalytic hydrogen evolution reaction (HER). Herein, we report the synthesis and characterizations of novel and high-efficiency noble-metal-free multiphasic MoSe2 nanosheets composed of metallic 1T phase and semiconducting 2H phase MoSe2 (denoted as 1T/2H MoSe2), and their implementation as cocatalysts to form photocatalytic heterostructure with 1D CdS nanorods (denoted as 1T/2H-MC). For comparison, conventional 2H MoSe2 and corresponding heterostructure 2H MoSe2/CdS i.e. 2H-MC were synthesized in parallel. The spectroscopic/electrochemical assays show that the 1 T/2H MoSe2 cocatalyst exhibits narrower bandgap, more active sites and better conductivity with respect to 2H MoSe2. As a consequence, the optimized 1T/2H-MC-10% exhibits drastically enhanced visible-light (λ > 420 nm) photocatalytic HER rate of 93.4 mmol/g/h, obviously higher than those of bare CdS (10.8 mmol/g/h), 2H-MC-10% (30.4 mmol/g/h) and Pt/CdS (50.4 mmol/g/h), respectively. Such an H2 production rate also exceeds all reported MoSe2-based heterostructure photocatalysts. Most importantly, the multiphasic 1 T/2H MoSe2 remained stable after aging for several months and the HER activity of the 1 T/2H-MC-10% was demonstrated to have no decay even after 8 cycling of visible-light HER.
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