▎ 摘　　要

Here, cerium (IV) molybdate nanoparticles (CeMo2O8) are anchored on the surface of an N, P co-doped reduced graphene oxide nanocomposite by a stepwise sonochemical approach and further investigated as an electrode for supercapacitors. The cerium (IV) molybdate/N, P co-doped reduced graphene oxide symmetric electrode exhibits an outstanding specific capacitance of 638 F g(-1)at 2 mV s(-1). The prominent electrochemical capacitive properties of nanocomposite electrode are attributed to the merits of high electrically conductive N, P co-doped reduced graphene oxide and short ion transport channels provided by CeMo(2)O(8)nanoparticles together with the synergistic effect between the two combinations. Furthermore, the symmetric supercapacitor based on CeMo2O8/N, P co-doped reduced graphene oxide electrodes demonstrates a high energy density (29.7 W h kg(-1)at 500 W kg(-1)), good power density (16,000 W kg(-1)at 14.3 W h kg(-1)), and remarkable cycling stability (102.9% capacitance retention after 4000 cycles at 100 mV s(-1)). The results clearly show that co-doping small amounts of N and P onto the reduced graphene oxide, through a simple impregnating method, significantly improves the supercapacitive performance of the nanocomposite electrode.