Preparation of Manganese Oxide/Bamboo Activated Carbon Electrode Materials with Excellent Electrochemical Performance

Abstract

Bamboo activated carbon (BAC) has excellent specific capacitance among electrode materials, but the important challenges of it are the insufficient energy density and power density currently. Herein, a facile method for the preparation of strong performance MnO/Mn3O4/C composites by putting BAC into KMnO4 solution and annealing in tube furnace. Interestingly, by controlling the reaction time and substrate concentration of BAC and KMnO4, it is possible to control not only the amount of MnOx doping, but also to change the ratio between MnOx, and thereby the electrochemical properties of MnOx/C was improved. Since BAC had a bilayer capacitance and manganese oxides could bring pseudo-capacitance to the materials, when the experimental conditions were reaction time and concentration of 20 min and 20 g/L respectively, the Mn content of the composite was 19.91% and it also had a excellent performance with 422.8 F/g of specific capacitance. In addition, the power and energy density were 30.76 Wh/kg and 3460 W/kg, respectively. It provided a basis for effectively improving the electrochemical performance of carbon-based electrode materials.