Microwave‐assisted synthesis of CuO/MnO <sub>2</sub> nanocomposites for supercapacitor application
Pengjiao Zhang, Wei Li
Abstract
Copper oxide/manganese dioxide (CuO/MnO 2 ) nanocomposites were prepared by a facile microwave‐assisted synthesis method in an ordinary household microwave oven and used for electrochemical supercapacitor. The nanocomposites were characterised by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, and X‐ray diffraction. Electrochemical results demonstrate that CuO/MnO 2 nanocomposites have better capacitance performance than pure CuO material. The CuO/MnO 2 nanocomposites have a high specific capacitance of 499.0 F/g at a current density of 0.5 A/g in 6 M KOH electrolyte. In addition, an asymmetric supercapacitor with activated carbon as a negative electrode and CuO/MnO 2 nanocomposite as a positive electrode was also successfully prepared. This asymmetric device exhibits a high energy density of 32.07 Wh/kg at a power density of 375.02 W/kg and fairly good cycling stability.