| Graphene has received a great deal of attention in application of dye-sensitizedsolar cell (DSSC) because of its ultra-low resistivity, good stability and excellentlight transmission properties. Graphene or graphene composites have replaced thetraditional materials used in DSSC successfully, and obtained good photoelectricconversion efficiency. Counter electrode as an important part of DSSCs is made ofplatinum catalyst carrier on conductive glass usually. However, platinum catalystrestricts its application in DSSC industrialization due to its high price, highproduction costs. In the paper we adopt graphene as a catalyst to replace the highprice of platinum counter electrode, expect to reduce the cost of DSSCs.In this paper, graphene prepared with graphite powder by REDOX. Grapheneoxides were prepared by pressurized oxidation and Hummers method, and graphenepowders were obtained with Graphene oxides by chemical reduction and the thermalreduction method. Platinum/graphene composite film as counter electrode wasobtained with graphene powders prepared by airtight oxidation method and chemicalreduction of sodium borohydride as a reducing agent on fluorine-doped tin oxide(FTO) glass by electro-hydrodynamic (EHD) method.The prepared samples were characterized by x-ray diffraction (XRD), infraredspectroscopy, Raman spectroscopy, scanning electron microscopy (SEM),transmission electron microscopy (TEM), etc. The results showed that grapheneoxide and graphene exhibited a complete structure, bigger size and uniform thickness.The surface of platinum/graphene electrode is smooth, with platinum particlesdistributing uniformly on graphene layer. The photoelectric conversion efficiency ofsolar cell with platinum/graphene electrodes has received up to4.10%， higher thanthat of the traditional platinum counter electrode. |
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