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1. Á¦ ¸ñ : Superior Metal-Free Counter Electrodes for Dye-Sensitized Solar Cells 2. ¿¬ »ç : ÀÌÀçÁØ ±³¼ö (°Ç±¹´ëÇб³ ³ª³ë±â¼ú¿¬±¸¼¾ÅÍ) 3. ÀÏ ½Ã : 2014³â 3¿ù 21ÀÏ (±Ý) ¿ÀÈÄ 17:00 ~ 18:00 4. Àå ¼Ò : ¼¿ï´ëÇб³ ½Å°øÇаü(301µ¿) 117È£ ¼¼¹Ì³ª½Ç
5. ³» ¿ë : Abstract : Highly efficient counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) were developed using thin films of scalable and high quality, nitrogen-doped graphene nanoplatelets (NGnP), which was synthesized by a simple two-step reaction sequence. The resultant NGnP was deposited on fluorine-doped SnO2 (FTO)/glass substrates by using electrospray (e-spray) coating, and their electrocatalytic activities were systematically evaluated for Co(bpy)33+/2+ redox couple in DSSCs with an organic sensitizer. The e-sprayed NGnP thin films exhibited outstanding performances as CEs for DSSCs. The optimized NGnP electrode showed better electrochemical stability under prolonged cycling potential, and its Rct at the interface of the CE/electrolyte decreased down to 1.73 Ω cm2, a value much lower than that of the Pt electrode (3.15 Ω cm2). The DSSC with the optimized NGnP-CE had higher fill factor (FF, 74.2%) and cell efficiency (9.05%), whereas those of the DSSC using Pt-CE were only 70.6 and 8.43%, respectively. To our best knowledge, the extraordinarily better current-voltage characteristcs of the DSSC-NGnP outperforming the DSSC-Pt for the Co(bpy)33+/2+ redox couple (in paticular, FF and short circuit current, Jsc) is highlighted for the first time.
6. ¾à ·Â : Jae-Joon Lee received his Ph.D. in Electrochemistry from Case Western Reserve University, Cleveland, Ohio, in 2000. Before joining Department of Applied Chemistry, Konkuk University, Korea, as professor in 2004, he worked at California Institute of Technology, Pasadena, California, as a post doctoral fellow from 2000 to 2004 in the Division of Chemistry and Chemical Engineering. Currently, he is the director of Naotechnology Research Center (Konkuk University) and also serving as the Secretary of General Affairs in the Korean Electrochemical Society (KECS) and the Managing Director of the Korean Society of Organic Solar Cells.
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