Facile synthesis of MoS2/graphene nanocomposite with high catalytic activity toward triiodide reduction in dye-sensitized solar cells

Tunghai University Institutional Repository > 理學院 > 應用物理學系所 > 期刊論文 > Item 310901/22690

Please use this identifier to cite or link to this item: http://140.128.103.80:8080/handle/310901/22690

Title:	Facile synthesis of MoS2/graphene nanocomposite with high catalytic activity toward triiodide reduction in dye-sensitized solar cells
Authors:	Liu, C.-J., Tai, S.-Y., Chou, S.-W., Yu, Y.-C., Chang, K.-D., Wang, S., Chien, F.S.-S., Lin, J.-Y., Lin, T.-W.
Contributors:	Department of Physics, Tunghai University
Keywords:	Active surface area;Cathodic current density;Charge transfer resistance;Counter electrodes;Cyclic voltammograms;Dye-Sensitized solar cell;Dye-sensitized solar cells;Electrochemical stabilities;Facile synthesis;Graphene oxides;High power conversion;Molybdenum disulfide;Novel catalysts;Peak current density;Tetrathiomolybdate;Triiodide;X ray photoemission spectroscopy
Date:	2012
Issue Date:	2013-05-21T09:14:29Z (UTC)
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%). This journal is ? 2012 The Royal Society of Chemistry.
Relation:	Journal of Materials Chemistry 22 (39) , pp. 21057-21064
Appears in Collections:	[應用物理學系所] 期刊論文

Files in This Item:

File	Size	Format
index.html	0Kb	HTML	260	View/Open

Loading...