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Three-dimensional (3D) hierarchical CoMn 2 O 4 @Co 3 O 4 core/shell nanoneedle/nanosheet arrays for high-performance supercapacitors were designed and synthesized on Ni foam by a two-step hydrothermal route. The hybrid nanostructure exhibits much more excellent capacitive behavior compared with either the pristine CoMn 2 O 4 nanoneedle arrays alone or Co 3 O 4 nanosheets alone. The formation of an interconnected pore hybrid system is quite beneficial for the facile electrolyte penetration and fast electron transport. The CoMn 2 O 4 @Co 3 O 4 electrode can achieve a high specific capacitance of 1627 F g -1 at 1 A g -1 and 1376 F g -1 at 10 A g -1 . In addition, an asymmetric supercapacitor (ASC) was assembled by using the CoMn 2 O 4 @Co 3 O 4 core/shell hybrid nanostructure arrays on Ni foam as a positive electrode and activated carbon as a negative electrode in an aqueous 3 M KOH electrolyte. A specific capacitance of 125.8 F g -1 at 1 A g -1 (89.2% retention after 5000 charge/discharge cycles at a current density of 2 A g -1 ) and a high energy density of 44.8 W h kg -1 was obtained. The results indicate that the obtained unique integrated CoMn 2 O 4 @Co 3 O 4 nanoarchitecture may show great promise as ASC electrodes for potential applications in energy storage.

rsc advances

Advanced binder-free electrodes based on CoMn2O4@Co3O4 core/shell nanostructures for high-performance supercapacitors