Graphene Nanoplatelet Cathode for Co(III)/(II) Mediated Dye-Sensitized Solar Cells

被引：239
作者：
Kavan, Ladislav [1 ,2 ]
Yum, Jun-Ho [2 ]
Nazeeruddin, Mohammad Khaja [2 ]
Graetzel, Michael [2 ]
机构：
[1] Acad Sci Czech Republ, J Heyrovsky Inst Phys Chem, Vvi, CZ-18223 Prague 8, Czech Republic
[2] Swiss Fed Inst Technol, Lab Photon & Interfaces, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland
来源：
ACS NANO | 2011年 / 5卷 / 11期
基金：
欧洲研究理事会;
关键词：
graphene; dye sensitized solar cell; cobalt redox shuttle; COST COUNTER-ELECTRODE; FUNCTIONALIZED GRAPHENE; CARBON; TRANSPARENT; TRANSPORT; FILMS;
D O I：
10.1021/nn203416d
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Graphene nanoplatelets (GNP) in the form of thin semitransparent film on F-doped SnO2 (FTO) exhibit high electrocatalytic activity for Co(L)(2); where L is 6-(1H-pyrazol-1-yl)-2,2'-bipyridine. The exchange current densities for the Co(2+/)3(+)(L)(2) redox reaction scaled linearly with the GNP film's optical absorbance, and they were by 1-2 orders of magnitude larger than those for the l(3-)/l(-) couple on the same electrode. The electrocatalytic activity of GNP films with optical transmission below 88% is outperforming the activity of platinized FTO for the CO2+/3+(L)(2) redox reaction. Dye-sensitized solar cells with Y123 dye adsorbed on TiO2 photoanode achieved energy conversion efficiencies between 8 and 10% for both GNP and Pt-based cathodes. However, the cell with GNP cathode is superior to that with Pt-FTO cathode particularly in fill factors and in the efficiency at higher illumination intensities.
引用
收藏
页码：9171 / 9178
页数：8
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