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Cocatalyst-free photocatalysts for efficient visible-light-induced H 2 production: Porous assemblies of CdS quantum dots and layered titanate nanosheets

Title
Cocatalyst-free photocatalysts for efficient visible-light-induced H 2 production: Porous assemblies of CdS quantum dots and layered titanate nanosheets
Authors
Kim H.N.Kim T.W.Kim I.Y.Hwang S.-J.
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2011
Journal Title
Advanced Functional Materials
ISSN
1616-301XJCR Link
Citation
vol. 21, no. 16, pp. 3111 - 3118
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Highly efficient, visible-light-induced H 2 generation can be achieved without the help of a Pt cocatalyst by new hybrid photocatalysts, in which CdS quantum dots (QDs) (particle size ≈2.5 nm) are incorporated in the porous assembly of sub-nanometer-thick layered titanate nanosheets. Due to the very-limited crystal dimension of component semiconductors, the electronic structure of CdS QDs is strongly coupled with that of the layered titanate nanosheets, leading to an efficient electron transfer between them and the enhancement of the CdS photostability. As a consequence of the promoted electron transfer, the photoluminescence of CdS QDs is nearly quenched after hybridization, indicating the almost-suppression of electron-hole recombination. These Pt-cocatalyst-free, CdS-layered titanate nanohybrids show much-higher photocatalytic activity for H 2 production than the precursor CdS QDs and layered titanate, which is due to the increased lifetime of the electrons and holes, the decrease of the bandgap energy, and the expansion of the surface area upon hybridization. The observed photocatalytic efficiency of these Pt-free hybrids (≈1.0 mmol g -1 h -1) is much greater than reported values of other Pt-free CdS-TiO 2 systems. This finding highlights the validity of 2D semiconductor nanosheets as effective building blocks for exploring efficient visible-light-active photocatalysts for H 2 production. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/adfm.201100453
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자연과학대학 > 화학·나노과학전공 > Journal papers
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