Investigation of Graphene-Based Gel-State Electrolytes and Counter Electrodes for Dye-Sensitized Solar Cells

• Main Authors: Shiao-Long Shiu, 許曉壟
• Other Authors: Chih-Hung Tsai
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/8pvxgv

碩士 === 國立東華大學 === 光電工程學系 === 106 === Dye-Sensitized Solar Cells (DSSCs) have attracted much attention due to their various merits, such as relatively high efficiencies, simple device structures, easy fabrication, and low cost. These features have made DSSCs attractive for solar energy applications in the face of increasing energy and environmental challenges. However, the problems of electrolyte's sealing, corrosion, thus lack of stability and the cost of Pt isrelatively expensive limit the commercialization of DSSCs. There are three parts in this study. First, we added the graphene, the lithium bis(trifluoromethanesulphonyl)imide, and camphorsulfonic acid into PMMA gel-based electrolytes, and the properties of the DSSCs were analyzed by J–V, IPCE, electrochemical impedance, and stability measurements. The highest power conversion efficiency of 8.46% was recorded for quasi-solid-state DSSCs with 0.05M Li bis, 0.05M CAS and 1.3mg/ml graphene . Second, the TiO2 nanoparticles and the graphene are employed to solidify an acetonitrile-based liquid electrolyte for DSSCs, and the properties of the DSSCs were analyzed by J–V, IPCE, electrochemical impedance, and stability measurements. The highest power conversion efficiency of 8.87% was recorded for quasi-solid-state DSSCs with 10.0 wt% TiO2 nanoparticles and 1.3mg/ml graphene as the gelator. Third, nanocomposite materials of GO and marcrocyclic Yb complex were prepared. The electrode properties and device efficiency were analyzed. The DSSCs fabricated with the rGO/Yb (1:10) CE exhibited a power conversion efficiency of 7.9%, which was higher than that of the Pt counter electrode.