A novel NiO/MnO 2 pompon-like hybrid structure was synthesized through a facile one-step hydrothermal in situ growth approach in this paper. NiO nanosheets grow on MnO 2 pompon-like microsphere to form typical hybrid structures which significantly increase the abundant active sites of electrode materials. The resulting NiO/MnO 2 electrode material exhibits an impressive specific capacity of 2706.1 F/g at a current density of 1 A/g. Remarkably, NiO/MnO 2 pompon-like hybrid structure shows excellent cycling performance and its capacity retention is maintained at 84.8% and the charge–discharge efficiency at 96% after 15,000 cycles. Even after undergoing 40,000 cycles, the electrode material maintains an outstanding charge–discharge efficiency of 95.2% with capacity retention of 69%, which revealing promising application as long-term electrode materials for supercapacitors.
A facile and energy efficient microwave synthesis of NiO/MnO 2 composite is presented in this study. The NiO nanoparticles (∼30 nm) and composite of NiO nanoparticles with nano-particle MnO 2 were grown on the surface of graphite. The morphologies and electrochemical performance of NiO@graphite and NiO/MnO 2 @graphite composite were tested and compared. The SEM results showed that addition of MnO 2 prevented the agglomeration of NiO nanoparticles. The electrochemical results of NiO/MnO 2 @graphite has demonstrated better performance than NiO@graphite, with higher specific capacitance of 102.78 mAh g −1 at 1 A g −1 and superior cycling stability with specific capacitance retention of 140% over more than 1500 cycles. The excellent electrochemical performance of NiO/MnO 2 @graphite makes it suitable for electrode material of supercapacitors .
危险品化学品经营许可证（带存储）