Synthesis of NiO@MnO2 core/shell nanocomposites for supercapacitor application

In this work, NiO@MnO2 core/shell nanocomposites were fabricated by a two-step method. The morphology and structure of the nanocomposites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction analysis and thermal gravity analysis. In addition, the supercapacitive performances were examined by cyclic voltammogram (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS). The electrochemical results indicate that the composite exhibits a specific capacitance of 266.7 F g(-1) at 0.5 A g(-1) and excellent cycling stability (81.7% retention after 2000 cycles at 1 A g(-1)). Therefore, this wok offers meaningful reference for supercpacitor applications in the future. (C) 2015 Elsevier B.V. All rights reserved.