▎ 摘　　要

A nanocomposite comprised lead selenide (PbSe) and reduced graphene oxide have been successfully synthesized via a facile one-step sonochemical synthesis route. The structural and physicochemical properties of PbSe-graphene composite are further characterized by X-ray diffraction, scanning electron microscopy with an energy dispersive X-ray analysis, transmission electron microscopy, and Raman spectroscopy analysis. Compared with pure PbSe, graphene based PbSe nanocomposites exploited as counter electrodes have exhibited outstanding electrocatalytic activity due to the introduction of reduced graphene oxide. An optimum concentration of Se2- (0.75 mM) in the PbSe/rGO paste is sufficient to fabricate counter electrode via single printing. PG2 CE exhibits a light-to-electric energy conversion efficiency of 6.5 %, which is increased by 82 % compared with the solar cell based on the pristine PbSe electrode under a simulated solar light irradiation of 100 mW cm(-2).