Manganese Oxide Nanorods Supported on Orange Peel-Based Carbon Nanosheets for High Performance Supercapacitors

A composite materials carbon nanosheets supported MnO2 nanorods exhibiting high capacitance performance can be fabricated by a simple and scalable method. The carbon nanosheets are easily obtained from the orange peel by carbonization at 800 degrees C, and MnO2 nanorods can be grown on the carbon nanosheets through the reaction between KMnO4 aqueous solution and the carbon. The electrochemical studies showed that the supercapacitor based on the hybrid materials with MnO2 content of 3.8 % exhibited the largest specific capacitance of 656 F g(-1) at a current density of 1 A g(-1), after 5000 cycles, the capacitance still retention above 80%. In addition, after MnO2 nanorods attached onto the carbon nanosheets layer, the BET specific surface area of this hybrid materials is improved to 573 m(2) g(-1), the addition of carbon nanosheets as a conducting agent improves the high-rate capability considerably, and the MnO2 nanorods crystals in turn is of great benefit to further exfoliating carbon nanosheets, which give the composite potential application as high-performance supercapacitor electrode materials.