纳米晶
材料科学
载流子
光催化
电荷(物理)
气相
化学物理
相(物质)
纳米技术
化学工程
物理化学
光电子学
化学
物理
催化作用
有机化学
工程类
量子力学
作者
Le He,Thomas E. Wood,Bo Wu,Yuchan Dong,Laura B. Hoch,Laura M. Reyes,Di Wang,Christian Kübel,Chenxi Qian,Jia Jia,Kristine Liao,Paul G. O’Brien,Amit Sandhel,Joel Y. Y. Loh,Paul Szymanski,Nazir P. Kherani,Tze Chien Sum,Charles A. Mims,Geoffrey A. Ozin
出处
期刊:ACS Nano
[American Chemical Society]
日期:2016-05-12
卷期号:10 (5): 5578-5586
被引量:122
标识
DOI:10.1021/acsnano.6b02346
摘要
The development of strategies for increasing the lifetime of photoexcited charge carriers in nanostructured metal oxide semiconductors is important for enhancing their photocatalytic activity. Intensive efforts have been made in tailoring the properties of the nanostructured photocatalysts through different ways, mainly including band-structure engineering, doping, catalyst-support interaction, and loading cocatalysts. In liquid-phase photocatalytic dye degradation and water splitting, it was recently found that nanocrystal superstructure based semiconductors exhibited improved spatial separation of photoexcited charge carriers and enhanced photocatalytic performance. Nevertheless, it remains unknown whether this strategy is applicable in gas-phase photocatalysis. Using porous indium oxide nanorods in catalyzing the reverse water-gas shift reaction as a model system, we demonstrate here that assembling semiconductor nanocrystals into superstructures can also promote gas-phase photocatalytic processes. Transient absorption studies prove that the improved activity is a result of prolonged photoexcited charge carrier lifetimes due to the charge transfer within the nanocrystal network comprising the nanorods. Our study reveals that the spatial charge separation within the nanocrystal networks could also benefit gas-phase photocatalysis and sheds light on the design principles of efficient nanocrystal superstructure based photocatalysts.
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