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SCI Article

Amplifying Charge-Transfer Characteristics of Graphene for Triiodide Reduction in Dye-Sensitized Sol
Author Sudhagar, P. (WCU Program); Song, Donghoon (WCU Program); Lee, Sang Yun (WCU Program); Choi, WonBong (WCU Program);
Corresponding Author Info Das, S (reprint author), Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA.
E-mail 씠硫붿씪 븘씠肄
Document Type Article
Source ADVANCED FUNCTIONAL MATERIALS Volume:21 Issue:19 Pages:3729-3736 Published:2011
Times Cited 57
External Information PDF 븘씠肄http://dx.doi.org/10.1002/adfm.201101191
Abstract The fabrication and functionalization of large-area graphene and its electrocatalytic properties for iodine reduction in a dye-sensitized solar cell are reported. The graphene film, grown by thermal chemical vapor deposition, contains three to five layers of monolayer graphene, as confirmed by Raman spectroscopy and high-resolution transmission electron microscopy. Further, the graphene film is treated with CF4 reactive-ion plasma and fluorine ions are successfully doped into graphene as confirmed by X-ray photoelectron spectroscopy and UV-photoemission spectroscopy. The fluorinated graphene shows no structural deformations compared to the pristine graphene except an increase in surface roughness. Electrochemical characterization reveals that the catalytic activity of graphene for iodine reduction increases with increasing plasma treatment time, which is attributed to an increase in catalytic sites. Further, the fluorinated graphene is characterized in use as a counter-electrode in a full dye-sensitized solar cell and shows ca. 2.56% photon to electron conversion efficiency with ca. 11 mA cm(-2) current density. The shift in work function in F- doped graphene is attributed to the shift in graphene redox potential which results in graphene's electrocatalytic-activity enhancement.
Web of Science Categories Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
Funding World Class University (WCU) [R31-2008-000-10092]; Engineering Research Center through Korea Science and Engineering Foundation [2010-0001842]; Ministry of Education, Science and Technology; Graduate School, Florida International University
Language English
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