▎ 摘　　要

The natural dye was extracted from Lycium ruthenicum Murray which was cultivated in Tibetan Plateau. The UV-Vis absorption spectra and cyclic voltammetry were used to characterize the dyes and confirm the optimal pH of the dye solutions. The influence of different contents of ethyl cellulose(EC) on the performance of electric catalytic of graphene nanoplates(GNs) counter electrode were investigated through electrochemical impedance spectra, cyclic voltammetry and Tafel polarization curve. DSCs were assembled by using the natural pigments with optimal pH as sensitizers and the GNs counter electrode with different contents of EC as counter electrode. It was found that the GNs counter electrode with 10wt% EC achieved the best performance of electric catalytic. The highest power conversion efficiency of the GNs counter electrode with 10wt% EC was 0.92%, close to that of Pt counter electrode (0.99%).