▎ 摘　　要

We report the synthesis of CdS nanospheres and reduced graphene oxide (rGO) hybrid nanocomposites (CdS@rGO) under hydrothermal conditions. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) are employed to confirm the structures and morphologies of sphere-like CdS@rGO nanocomposites. The electrocatalytic activity for the reduction of triiodide and chemical stability for CdS@rGO composites are studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel plots. The short-circuit current density (J(sc)), open-circuit voltage (V-oc) and fill factor (FF) are 14.81 mA cm(-2), 0.76 V and 0.656, respectively. Most importantly, these CdS@rGO materials are used as the counter electrode (CE) of dye-sensitized solar cells (DSCs), and their conversion efficiency of this CE reaches 7.39%, which is comparable to the conventional platinum counter electrode (7.44%) under the same test conditions. Meanwhile, the CdS@rGO CE possesses the robust stability and the cost-effective performance in addition to the high power conversion efficiency. (C) 2015 Elsevier Ltd. All rights reserved.