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Homogenous Al-doped MnO2 supercapacitor materials with excellent electrochemical properties are synthesized by employing an one-step hydrothermal method in this study. The optimal sample shows morphologies of sea urchin-like micro-spheres, which consists of uniform nanowires with diameters of approximate 30 nm. The Al-doped MnO2 has enhanced crystallinity and electrical conductivity than the pure MnO2, which is beneficial to the supercapacitive performance. The optimal Al-doped MnO2 elctrode material exhibits a high specific capacitance of 101 F·g at a high scan rate of 200 mV·s and a remarkable long-term cycling stability of 99.6% capacitance retention over 20,000 charge/discharge at 5 A·g. These results indicate that the sea urchin-like Al-doped MnO2 nanowires have extensive application prospects in supercapacitors.

Sea urchin-like Al-doped MnO2 nanowires with excellent cycling stability for supercapacitor