Ultrafine manganese dioxidenanowire network for high-performance supercapacitors

Ultrafine MnO2 nanowires with sub-10 nm diameters have been synthesized by a simple process of hydrothermal treatment with subsequent calcinations to form networks that exhibit an enhanced specific capacitance (279 F g−1 at 1 A g−1), high rate capability (54.5% retention at 20 A g−1) and good cycling stability (1.7% loss after 1000 cycles).