▎ 摘　　要

This research demonstrated the preparation of composite materials between polypyrrole and graphene by cetyltrimethylammonium bromide (CTAB)-assisted polymerization method for use as a counter electrode in dye-sensitized solar cells (DSSCs). The properties of composites were investigated and analyzed by using X-ray diffraction (XRD), raman spectroscopy, fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and cyclic voltammetry (CV). The electrical conductivity and the efficiency of dye-sensitized solar cells with graphene-polypyrrole counter electrode were also studied. The results showed that the addition of graphene in polypyrrole could improve its conductivity due to the formation of bipolaron state. According to CV test, the addition of graphene did not degrade the electrocatalytic performance of polypyrrole. As a consequence, DSSCs based on polypyrrole-graphene counter electrodes exhibited an enhanced energy conversion efficiency, which was comparable to conventional Pt counter electrode.