Ahmad Iftikhar, McCarthy Joseph E, Baranov Alexander, Gun'ko Yurii K
School of Chemistry and CRANN, Trinity College Dublin, Dublin 2, Ireland.
International Research and Education Centre for Physics of Nanostructures, ITMO University, St. Petersburg 197101, Russia.
Materials (Basel). 2015 Sep 7;8(9):5953-5973. doi: 10.3390/ma8095284.
Graphene has been envisaged as a highly promising material for various field emission devices, supercapacitors, photocatalysts, sensors, electroanalytical systems, fuel cells and photovoltaics. The main goal of our work is to develop new Pt and transparent conductive oxide (TCO) free graphene based counter electrodes (CEs) for dye sensitized solar cells (DSSCs). We have prepared new composites which are based on graphene nano-platelets (GNPs) and conductive polymers such as poly (3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS). Films of these composites were deposited on non-conductive pristine glass substrates and used as CEs for DSSCs which were fabricated by the "open cell" approach. The electrical conductivity studies have clearly demonstrated that the addition of GNPs into PEDOT:PSS films resulted in a significant increase of the electrical conductivity of the composites. The highest solar energy conversion efficiency was achieved for CEs comprising of GNPs with the highest conductivity (190 S/cm) and n-Methyl-2-pyrrolidone (NMP) treated PEDOT:PSS in a composite film. The performance of this cell (4.29% efficiency) compares very favorably to a DSSC with a standard commercially available Pt and TCO based CE (4.72% efficiency in the same type of open DSSC) and is a promising replacement material for the conventional Pt and TCO based CE in DSSCs.
石墨烯被视为一种在各种场发射器件、超级电容器、光催化剂、传感器、电分析系统、燃料电池和光伏领域极具潜力的材料。我们工作的主要目标是开发用于染料敏化太阳能电池（DSSC）的新型无铂和透明导电氧化物（TCO）的基于石墨烯的对电极（CE）。我们制备了基于石墨烯纳米片（GNP）和导电聚合物如聚（3,4 - 乙烯二氧噻吩）聚（苯乙烯磺酸盐）（PEDOT:PSS）的新型复合材料。这些复合材料的薄膜沉积在非导电的原始玻璃基板上，并用作通过“开放式电池”方法制造的DSSC的对电极。电导率研究清楚地表明，将GNP添加到PEDOT:PSS薄膜中会导致复合材料的电导率显著增加。对于由具有最高电导率（190 S/cm）的GNP和在复合薄膜中经N - 甲基 - 2 - 吡咯烷酮（NMP）处理的PEDOT:PSS组成的对电极，实现了最高的太阳能转换效率。该电池的性能（效率为4.29%）与具有标准市售基于铂和TCO的对电极的DSSC（在相同类型的开放式DSSC中效率为4.72%）相比非常有利，并且是DSSC中传统基于铂和TCO的对电极的一种有前景的替代材料。
