NDLI: Facile synthesis of MoS<sub>2</sub>/graphene nanocomposite with high catalytic activity toward triiodide reduction in dye-sensitized solar cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Shuei Chou, Shu-Wei Tai, Sheng-Yen Lin, Jeng-Yu Lin, Tsung-Wu Chang, Kai-Di Chien, Forest Shih-Sen Yu, Ya-Chu Liu, Chia-Jui
Copyright Year	2012
Abstract	In the current study, a nanocomposite of molybdenum disulfide and graphene (MoS2/RGO) was proposed for the first time as the counter electrode (CE) catalyst in dye-sensitized solar cells (DSSCs) to speed up the reduction of triiodide (I3−) to iodide (I−). This novel catalyst was synthesized by simply mixing graphene oxide nanosheets with a solution of ammonium tetrathiomolybdate and then converting the solid intermediate into MoS2/RGO nanocomposite in a H2 flow at 650 °C. Atomic force microscopy, X-ray powder diffraction and X-ray photoemission spectroscopy confirmed that MoS2 nanoparticles were deposited onto the graphene surface. The extensive cyclic voltammograms (CV) showed that the cathodic current density of the MoS2/RGO CE was higher than those of MoS2, RGO and sputtered Pt CEs, due to the increased active surface area of the former. Moreover, the peak current densities of the MoS2/RGO CE showed no sign of degradation after 100 consecutive CV tests, suggesting the great electrochemical stability of the MoS2/RGO CE. Furthermore, the MoS2/RGO CE demonstrated an impressively low charge-transfer resistance (0.57 Ω cm2) for I3− reduction. Finally, the DSSC assembled with the MoS2/RGO CE showed a high power conversion efficiency of 6.04%, which is comparable to the DSSC with a Pt CE (6.38%).
Starting Page	21057
Ending Page	21064
Page Count	8
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	39
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm33679k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DSSC Nanocomposite Molybdenum disulfide Graphene Electrode Dye-sensitized solar cell Triiodide Tetrathiomolybdate Atomic-force microscopy Powder diffraction X-ray crystallography Photoemission spectroscopy Cyclic voltammetry Partial current Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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