▎ 摘　　要

We synthesized two kinds of NiSe2 crystalline material grown on graphene (microsphere NiSe2/RGO and octahedron NiSe2/RGO) through a facile hydrothermal route. Their catalytic activities as the counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) were investigated through I-V curves and conversion efficiency tests. Attributed to the outstanding carrier transfer properties of graphene nanosheets, the NiSe2/graphene materials exhibited an excellent electrochemical performance, and microsphere NiSe2/RGO showed a better electrocatalytic performance as the CE for the reduction of triiodide than that of Pt. Furthermore, Tafel polarization and electrical impedance spectroscopy (EIS) were performed to evaluate the electrocatalytic activity of the as-prepared CEs.