Synthesis Of Graphene And Its Composite Materials And Its Application On Counter Electrode For Dye Sensitized Solar Cell

Dye-sensitized solar cell as a new-style of photoelectrochemical solar cells,compared with traditional solar cells, has attracted considerable attention due to its simple production technology, low production and high energy conversion efficiency.Traditional Pt electrode has shown unique catalytic properties, high electronic conductivity and chemical stability. However, the large-scale application of Pt counter electrode may be limited because of high cost prices. In recent years, graphene has been widely applied to the counter electrode of the DSSC due to its high conductivity and stability. Cellular distribution of carbon film can provide high specific surface area, as a result, it has been become an ideal carbon film, which can replace Pt electrode.Nevertheless,hybrid carbon film, composited of graphene and porous carbon film, can give full play to the advantages of both carbon films, have high electrical conductivity,good electrochemical activity, and rich porous structure, and thus are very suitable for using in dye-sensitized solar cell(DSSC) as counter electrode. The main contents are presented as follow:(1) The synthesis of graphene and its composite materials as counter electrode:here,a facile and simple approach was developed for fabricating free-standing porous carbon film/multilayer graphene hybrid film(PCF/MGF), multilayer graphene film(MGF) and porous carbon film(PCF) materials by ambient pressure chemical vapor deposition(APCVD),and used in the counter electrode of DSSC. Field emission scanning electron microscope(FSEM) was used to characterized the morphology of the PCF/MGF, PCF and MGF.(2) The performance research on dye-sensitised solar cell of counter electrode:graphene and its composite materials for counter electrode were applied to DSSC,Subsequently, and photovoltaic and electrochemical performance of graphene and its composite materials as counter electrode for DSSC were investigated. Compared with MGF and PCF counter electrodes, the PCF/MGF counter electrode exhibited a low charge-transfer resistance(Rct) and higher electrocatalytic activity for tri-iodide reduction.The DSSC based on the PCF/MGF counter electrode achieved a power conversion efficiency of 2.96%, and showed improved catalytic property in comparison with MGF counter electrode(2.26%) and PCF counter electrode(0.91%) under the same experimental condition.