Platinum/graphene hybrid film as a counter electrode for dye-sensitized solar cells

摘要

A platinum nanoparticles/graphene nanosheets (PtNP/GN) film was prepared on rigid fluorine-doped tin oxide substrate by using a facile one step electrochemical deposition method, and the film was used as counter electrode for dye-sensitized solar cell (DSSC). The cyclic voltammetry, electrochemical impedance spectroscopy and Tafel curves measurements indicated that the PtNP/GN CE has higher conductivity and better electrocatalytic activity for I_3~-/I~- redox reaction, lower charge transfer resistance on the electrolyte/electrode interface for I_3~-/I~- redox reaction than that of Pt electrode, which is due to that the synergistic effect combined platinum nanoparticles with graphene nanosheet intrinsic characteristic. As a result, the DSSC based on the PtNP/GN counter electrode achieved a high power conversion efficiency of 7.88% under AM1.5 illumination of 100mW cm~(-2), which is higher 21.04% than that of the DSSC based on Pt electrode.