▎ 摘　　要

In the current study, reduced graphene oxide (rGO) and crystalline CoS2 were combined to create nanoscale counter electrodes via a simple hydrothermal method. When the resulting CoS2/rGO was evaluated for use as a counter electrode in dye-sensitized solar cells, it exhibited excellent electrochemical activity toward the reduction of I-3(-), which was a consequence of the increased number of active catalytic sites in CoS2/rGO and the high conductivity of graphene. The CoS2/rGO synthesis process is simple and scalable, and can easily be adapted for large-scale electrocatalytic film fabrication for several other electrochemical energy harvesting and storage applications.