Journal
NANO RESEARCH
Volume 7, Issue 10, Pages 1497-1506Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0511-2
Keywords
photocatalysis; lifetime; ammonia degradation; water oxidation; montmorillonite exfoliation
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Funding
- National Basic Research Program of China [2010CB933503, 2013CB933203]
- National Natural Science Foundation of China [51102262, 51272269]
- Science Foundation for Youth Scholars of the State Key Laboratory of High Performance Ceramics and Superfine Microstructures [SKL201204]
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The kinetic competition between electron-hole recombination and water oxidation is a key limitation for the development of efficient solar water splitting materials. In this study, we present a solution for solving this challenge by constructing a quantum dot-intercalated nanostructure. For the first time, we show the interlayer charge of the intercalated nanostructure can significantly inhibit the electron-hole recombination in photocatalysis. For Bi2WO6 quantum dots (QDs) intercalated in a montmorillonite (MMT) nanostructure as an example, the average lifetime of the photogenerated charge carriers was increased from 3.06 mu s to 18.8 mu s by constructing the intercalated nanostructure. The increased lifetime markedly improved the photocatalytic performance of Bi2WO6 both in solar water oxidation and environmental purification. This work not only provides a method to produce QD-intercalated ultrathin nanostructures but also a general route to design efficient semiconductor-based photoconversion materials for solar fuel generation and environmental purification.
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