Facile preparation of ultrafine manganese dioxide nanowires on activated carbon paper with enhanced capacitance for supercapacitors

In this paper, a structure with growing MnO 2 nanowires (NWs) on activated carbon paper was designed and prepared using a simple hydrothermal method. Electrochemical measurements show that the specific capacitance of these MnO 2 nanowires/ACP reached 390 F g −1 at a scan rate of 10 mV s −1 and 529 F g −1 at a current density of 2.0 A g −1 . The long-term cycle life stability for MnO 2 nanowires/ACP was examined and the results show that the capacitance decay was ~12% over 5000 cycles, indicating its long cycle life. Furthermore, they could also be used to assemble simple solid-state supercapacitors with high capacitance. These results show that the MnO 2 nanowires/ACP could be a promising electrode material for energy storage.