High-performance self-assembly MnCo2O4 nanosheets for asymmetric supercapacitors

In this study, MnCo2O4 nanosheets were proposed to be utilized as an electrode material for supercapacitors. A two-step hydrothermal method with post-annealing treatment was employed in preparation of the nanostructures. MnCo2O4 electrode delivered a high specific capacitance of 2000 F g(-1) at 0.5 A g(-1), remarkable high-rate capability of 1150 F g(-1) at 20 A g(-1), and an excellent cycling stability of 92.3% at 5 A g(-1) after 5000 cycles. It is found that a three-electrode supercapacitor based on MnCo2O4 exhibits a promising electrochemical performance, better than the other similar materials, benefited from the synergistic effects of MnCo2O4 nanosheets. In fact, the self-assembly of nanosheets structure with high specific surface area and mesoporous structure can potentially enhance the electrochemical performance of supercapacitors. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.