光催化
半导体
带隙
材料科学
三元运算
光电子学
可见光谱
制氢
紫外线
纳米技术
电子能带结构
光化学
氢
化学
催化作用
计算机科学
物理
生物化学
有机化学
程序设计语言
量子力学
作者
Yanrui Li,Lei-Lei Li,Yunqi Gong,Song Bai,Huanxin Ju,Chengming Wang,Qian Xu,Junfa Zhu,Jun Jiang,Yujie Xiong
出处
期刊:Nano Research
[Springer Science+Business Media]
日期:2015-09-30
卷期号:8 (11): 3621-3629
被引量:72
标识
DOI:10.1007/s12274-015-0862-3
摘要
A Z-scheme is a promising approach to achieve broad-spectrum photocatalysis. Integration of TiO2 with another semiconductor with a band gap of ∼1.0 eV would be ideal to harvest both ultraviolet and visible-near infrared light for photocatalysis; however, most narrow-bandgap semiconductors have straddling band structure alignments with TiO2, constituting an obstacle to forming the Z-scheme for photocatalytic hydrogen production. In this communication, we demonstrate Ag2S as a model system where the energy band upshift of the narrow-bandgap semiconductor that shares an interface with a metal can overcome this limitation. To fabricate the design, we developed a unique approach to synthesize Ag2S–Ag–TiO2 hybrid structures. The obtained ternary hybrid structures exhibited dramatically enhanced performance in photocatalytic hydrogen production under full-spectrum light illumination. The activities were significantly higher than the sum of those of Ag2S–Ag–TiO2 structures under λ < 400 nm and λ > 400 nm irradiation as well as those of their counterparts under any light illumination conditions.
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