▎ 摘　　要

Co3O4/graphene composites are obtained by hydrothermal synthesis method using different surfactants, followed by calcining precursors at different temperature. XRD and SEM show that different surfactants have a great influence on the crystallite size and the morphology of Co3O4 in the composites. The crystallite size of Co3O4 in the composites increases with increasing calcining temperature. Electrochemical property displays that the composites prepared in the presence of sodium dodecyl benzene sulfonate (SDBS) surfactant exhibit higher specific capacitancethan those synthesized with addition of Triton X-100 surfactant. Amongall the electrodes, Co3O4/GNS-S-350 (Co3O4/graphene composites prepared using SDBS and following by calcining precursorsat 350 degrees C) electrode exhibits the highest specific capacitance. Its specific capacitancereaches 1033.4 F g(-1) at 0.2 A g(-1) and is 3.21 times of that of Co3O4/GNS-T-250 (Co3O4/graphene composites prepared using Triton X-100 and following by calcining precursors at 250.) electrode. A specific capacitance of 494.2 F g(-1) is exhibited at 7.2 Ag-1, demonstrating appealing rate performance. After 1000 cycles, the specific capacitanceis 2.15 times of that of Co3O4/GNS-T-250 electrode, further demonstrates the great advantages as supercapacitors electrode.