▎ 摘　　要

In this work, we used the electrophoretic deposition (EPD) technique for the fabrication of Co3O4-Graphene nano-composite as the binder-free electrode for electrochemical supercapacitors. Cobalt nitrate salt was used as the charging agent for EPD of graphene, Co3O4, and their co-deposition. Characterization of the obtained layer by optical microscopy and scanning electron microscopy (SEM) revealed that there was no deposition in the suspension without additive such as nitrate cobalt salt, whereas a uniform layer was formed in the presence of nitrate cobalt salt. Energy dispersive spectroscopy (EDS) analysis of the graphene coating deposited via EPD approved the successful electrodeposition of Co nano-petals between graphene nano-plates. Cyclic voltammetry (CV) was done for measuring the capacitance of the deposited layer in the range of 10-100 mVs(-1). The Co3O4 and Co3O4-Graphene nano composite revealed 236.5 and 319.6 F g(-1) at 10 mVs(-1) scan rate, respectively. Enhancement in the specific capacitance of the composite was attributed to association graphene in the microstructure. (c) 2020 Elsevier B.V. All rights reserved.