Enhanced photoelectrochemistry and interactions in cadmium selenide-functionalized multiwalled carbon nanotube composite films

M, Deepa and Gakhar, R and Joshi, A G and Singh, B P and Srivastava, A K (2010) Enhanced photoelectrochemistry and interactions in cadmium selenide-functionalized multiwalled carbon nanotube composite films. Electrochimica Acta, 55 (22). pp. 6731-6742. ISSN 0013-4686

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Abstract

Cadmium selenide-functionalized multiwalled carbon nanotube (CdSe-f-MWCNT) composite films have been synthesized by the percolation of a f-MWCNT dispersion through the macropores of electrodeposited CdSe thin films during electrophoretic deposition. Evidence for efficient charge transfer from CdSe to f-MWCNTs was obtained by photoluminescence quenching and proof for strong interactions was provided by X-ray photoelectron spectroscopy analyses, which revealed a significant decrease in the reduced Se2- content and evolution of new signals due to oxidized Se, and high resolution transmission electron microscopy and atomic force microscopy images of CdSe decorated f-MWCNTs in the composite film. Sputter depth profiling of the composite confirmed a homogeneous mixing of nanoparticulate CdSe and f-MWCNTs. A quasi solid-state photoelectrochemical cell fabricated by coupling the composite film with an ionic liquid based gel polymer electrolyte containing the I 3/I- redox pair not only showed larger photocurrents, photovoltage and incident photon to current conversion efficiency as compared to the analogous CdSe cell but also showed a remarkably enhanced stability to photoerosion. The ability of f-MWCNTs to mediate fast charge transfer and retard charge recombination rate in the composite was also evident from electrochemical impedance spectroscopy (EIS) results. Cell degradation upon exposure was also reflected in the altered EIS parameters such as increased charge transfer resistance and the reduced ease of charge transport through the composite. Â© 2010 Elsevier Ltd. All rights reserved.

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IITH Creators:

IITH Creators	ORCiD
M, Deepa	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Atomic force; Cadmium selenides; CdSe thin films; Charge recombinations; Charge transfer resistance; Charge transport; Electrophoretic depositions; Enhanced stability; Functionalized multi-walled carbon nanotubes; Gel polymer electrolytes; Incident photon-to-current conversion efficiencies; Macropores; Multi-walled; Nano particulates; Photo-electrochemistry; Photo-voltage; Photoelectrochemicals; Photoluminescence quenching; Redox pairs; Sputter-depth profiling; Strong interaction; Cadmium selenide; Electrodeposition; Multiwalled carbon nanotubes; Photoelectrochemical

Subjects:

Chemistry

Divisions:

Department of Chemistry

Depositing User:

Users 3 not found.

Date Deposited:

13 Oct 2014 04:15

Last Modified:

18 Oct 2017 10:07

URI:

http://raiithold.iith.ac.in/id/eprint/206