Oxidation-etching preparation of MnO2 tubular nanostructures for high-performance supercapacitors.

摘要: 1D hierarchical tubular MnO2 nanostructures have been prepared through a facile hydrothermal method using carbon nanofibres (CNFs) as sacrificial template. The morphology of can be adjusted by changing the reaction time or annealing process. Polycrystalline nanotubes are formed with short (e.g., 10 min) while composed assembled nanosheets obtained at longer times (>45 min). polycrystalline further converted to porous nanobelts and sponge-like nanowires in air. Among all types prepared, show optimized charge storage performance when tested supercapacitor electrodes, for example, delivering an power density 13.33 kW·kg–1 energy 21.1 Wh·kg–1 long cycling life over 3000 cycles, which is mainly related their features large specific surface area optim...