NiO/MnO2 core/shell nanocomposites for high-performance pseudocapacitors

NiO/MnO2 core/shell nanocomposites have been fabricated by a facile hydrothermal method. The nanocomposites consist of NiO nanowires with the diameter of 70-80 nm which are coated by plenty of MnO2 nanosheets as secondary nanostructures. The NiO@MnO2 nanocomposites are used subsequently to construct a pseudocapacitor. Electrochemical tests reveal a high specific capacitance of 528.0 F g−1 at a scan rate of 1 mV s−1 and a good cycling stability of 109.9% after 5000 cycles, both of which are much higher compared to that of the pseudocapacitor based on pure NiO nanowires (307.0 F g−1 and 87.8%, respectively). Therefore, these NiO/MnO2 nanocomposites have great superiority as electrode material in high-performance pseudocapacitors.