Controlled crystallization growth of clew-like α-MnO2 nanostruture for electrochemical capacitor

Clew-like α-MnO₂ nanostructrues have been synthesized via a controlled crystallization growth method. The as-obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy and N₂ adsorption-desorption. Results show that the clew-like α-MnO₂ exhibits a mesoporous characteristic and the morphologies of clew-like α-MnO₂ are made up of interleaving nanoplates. The pore size distribution of the product is uniform. The electrochemical properties of the synthesized clew-like α-MnO₂ shows 272.5 F g^-1 specific capacitance in 1 mol L^-1 Na₂SO₄ solution at 2mV s^-1 scan rate and less 2% capacitance loss after 800cycles at 10 mV s^-1 scan rate. The clew-like α-MnO₂ with good electrochemical performance can be a promising candidate as supercapacitor materials.