MnCoOx-multi-walled carbon nanotubes composite with ultra-high specific capacitance for supercapacitors

Spherical MnCoO x and MnCoO x -multi-walled carbon nanotubes (MnCoO x -MWCNTs) were synthesized by hydrothermal method , and applied as electrode materials for supercapacitors . Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS) and other electrochemical test methods are used to screen the properties of MnCoO x with different Co/Mn molar ratios and MnCoO x -MWCNTs with different MWCNTs qualities. The performance comparisons show that when the molar ratio of Co/Mn was 1:1, the discharge capacitance of as-prepared MnCoO x -MWCNTs composite containing 0.1 g MWCNTs is as high as 930.00 F g −1 at the current density of 1.0 A g −1 . The retention rate of specific capacitance of optimal MnCoO x -MWCNTs remains 88.2% after 5000 cycles at the current density of 8.0 A g −1 . Therefore, MnCoO x -MWCNTs composite as electrode material has broad development prospects.