Controlled synthesis of MnO2 nanosheets vertically covered FeCo2O4 nanoflakes as a binder-free electrode for a high-power and durable asymmetric supercapacitor.

摘要: We developed a simple and controlled method to synthesize FeCo 2 O 4@ MnO 2 core–sheath nanoarchitecture (CSN) grown on Ni foam. Ultrathin FeCo 2 O 4 nanoflakes with an average thickness of 10 nm served as the scaffold to deposit the MnO 2 nanosheets. The MnO 2 nanosheets were able to vertically grow on FeCo 2 O 4 nanoflakes to form a sheath via a hydrothermal reaction. The nanocomposites' thickness could be tailored from 80 nm–550 nm by changing the reaction times. Electrochemical measurements demonstrated that …