▎ 摘　　要

Facile synthesis of porous and high conductive materials is highly desirable for supercapacitor electrode application. In this work, hierarchical porous CoMn(CoMn)(2)O-4 spinel coated on reduced graphene oxide (rGO) was synthesized successfully through mixed solvothermal process followed by calcination. By adjusting the solvent ratio of dimethyl formamide (DMF): deionized (DI) water used in the mixed solvothermal process, the surface morphology of CoMn(CoMn)(2)O-4/rGO can be tuned from nanofiber to nanoplate. The nanoplates display the highest surface area of 133.1 m(2) g(-1) with the pore size of 3 nm, whereas the corresponding electrode exhibits the highest capacitance of 571 F g(-1) at a current density of 1 A g(-1), with the working potential as high as 1 V. In addition, the electrode based on nanoplates can retain about 84% of the initial capacitance after 1500 cycles at a charge current density of 5 A g(-1). These results confirm that the mesoporous CoMn(CoMn)(2)O-4 nanoplates supported on rGO, synthesized the facile method described here, is a promising candidate for supercapacitor applications. (C) 2015 Elsevier Ltd. All rights reserved.