Hydrothermal preparation of MnNiO3/Ni6MnO8 nanospheres on nickel foam as a high stability electrode material for supercapacitor

Fabrication of polypyrrole conductive matrix covered MnNi2O4 nanocomposite as a positive electrode material for asymmetric supercapacitor applications

“…It also retains the energy density of 27.3 W h kg −1 at a power density of 3941.2 W kg −1 at 5 A g −1 . The obtained energy and power density are superior to those reported previously for Mn, Ni, and conducting polymer-based ASC devices, such as MnNiO 3 /Ni 6 MnO 8 //AC (22.3 W h kg −1 at 1074.7 W kg −1 ), 41 MnO 2 //AC (17.3 W h kg −1 at 605 W kg −1 ), 42 Mn- Co -S/GNF//GO (14.3 W h kg −1 at 74.8 W kg −1 ), 43 NiMn-LDH@CuO/CF//AC (10.8 W h kg −1 at 100 W kg −1 ), 44 MnO 2 //3D-graphene (6.8 W h kg −1 at 62 W kg −1 ), 45 MnS/GO-NH 3 //AC (14.9 W h kg −1 at 66.5 W kg −1 ), 46 MnNiO 3 /rGO//AC (8.4 W h kg −1 at 675 W kg −1 ), 47 and NiMnO 3 //AC (11.1 W h kg −1 at 198.5 W kg −1 ). 48 The remarkable capacitance performance and elevated cell voltage of the MnNi 2 O 4 /PPY//AC device account for its markedly enhanced energy and power density.…”