3D hierarchical flower-like MnCo2O4@NiO nanosheet arrays for enhanced-performance asymmetric supercapacitors

Promising hydrothermal synthesis and calcination strategy is used in manufacturing the 3D hierarchical MnCo 2 O 4 @NiO nanosheets. This paper is a preliminary attempt to prepare a novel MnCo 2 O 4 @NiO electrode through an effectual hydrothermal procedure, in which the nickel foam is used as a backbone structure. At a current density of 1 A g −1 , the positive electrode material reveals a maximum specific capacitance of 1914 F g −1 . The specific capacitance of MnCo 2 O 4 @NiO remains 95.4% irrespective of 8000 cycles. The as-assembled supercapacitor (SC) exhibits an energy density of 40.04 Wh kg −1 at a power density of 770 W kg −1 . The result of this research highlights the evidence of the 3D hierarchical MnCo 2 O 4 @NiO structure for being an encouraging candidate for the forthcoming energy storage utilization. • The MnCo 2 O 4 @NiO composite electrode is synthesized via hydrothermal-calcination method. • The MnCo 2 O 4 @NiO composite electrode provides high specific capacitance of 1914 F g −1 . • The electrode exhibits exceptional cycling stability of 95.4% even after 10,000 cycles. • The MnCo 2 O 4 @NiO//AC ASCs device possesses high energy density and power density.