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Journal of Materials Science
Published in: Journal of Materials Science 12/2017

02-03-2017 | Original Paper

In2S3 nanoparticles dispersed on g-C3N4 nanosheets: role of heterojunctions in photoinduced charge transfer and photoelectrochemical and photocatalytic performance

Authors: Sanjay B. Kokane, R. Sasikala, D. M. Phase, S. D. Sartale

Published in: Journal of Materials Science | Issue 12/2017

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Abstract

Fast recombination of photogenerated charge carriers is a major problem in the photoelectrochemical and photocatalytic processes. In this work, we report significantly improved PEC performance of a nanocomposite consists of In2S3 nanoparticles dispersed on g-C3N4 nanosheets synthesized by a simple and facile wet chemical route. The results of high-resolution TEM study show that the obtained In2S3 nanoparticles of size 10–20 nm exist in cubic phase and are uniformly dispersed on the surface of g-C3N4 nanosheets. The In2S3/g-C3N4 nanocomposite with 25 weight percentage of In2S3 exhibits 8.5 times higher photocurrent density than the single-phase g-C3N4 under visible light illumination. The enhanced photocurrent density exhibited by the In2S3/g-C3N4 nanocomposite is attributed to the efficient separation of photogenerated charge carriers. The charge transfer mechanism in In2S3/g-C3N4 heterojunction was studied by a series of experiments, such as electrochemical impedance spectroscopy, photoelectrochemical measurement and photoluminescence emission spectroscopy. The intimate interface promotes the charge transfer and inhibits the recombination rate of photogenerated electron–hole pairs, which significantly improves the photoelectrochemical performance. A detailed charge transfer mechanism is discussed based on the Mott–Schottky plot study. This heterojunction material is found to be an efficient photocatalyst for the degradation of both cationic rhodamine B dye and anionic methyl orange dye as the lifetime of photogenerated charge carriers is higher in the composite than in single-phase In2S3 and g-C3N4. A strong correlation between the photoelectrochemical and the photocatalytic performances is observed in this composite.
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Appendix
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Metadata
Title
In2S3 nanoparticles dispersed on g-C3N4 nanosheets: role of heterojunctions in photoinduced charge transfer and photoelectrochemical and photocatalytic performance
Authors
Sanjay B. Kokane
R. Sasikala
D. M. Phase
S. D. Sartale
Publication date
02-03-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 12/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-0940-x

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