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

摘要

A composite materials carbon nanosheets supported MnO2 nanorods exhibiting high capacitanceperformance can be fabricated by a simple and scalable method. The carbon nanosheets are easilyo obtained from the orange peel by carbonization at 800 C, and MnO2 nanorods can be grown on thecarbon nanosheets through the reaction between KMnO4 aqueous solution and the carbon. Theelectrochemical studies showed that the supercapacitor based on the hybrid materials with MnO2-1 -1 content of 3.8 % exhibited the largest specific capacitance of 656 F g at a current density of 1 A g ,after 5000 cycles, the capacitance still retention above 80%. In addition, after MnO2 nanorods attachedonto the carbon nanosheets layer, the BET specific surface area of this hybrid materials is improved to2 -1 573 m g , the addition of carbon nanosheets as a conducting agent improves the high-rate capabilityconsiderably, and the MnO2 nanorods crystals in turn is of great benefit to further exfoliating carbonnanosheets, which give the composite potential application as high-performance supercapacitorelectrode materials.