Abstract

Hydrous manganese dioxide nanostructures were synthesized via a catalytic oxidationreaction mechanism at mild temperatures. It was found that the morphology of themanganese dioxide nanostructures was significantly influenced by the pH of the reactionsystem. With increasing pH the morphology of manganese dioxide nanostructures changedfrom urchin-like structures to nanobelts. The capacitive performance was investigated byusing cycle voltammetry and galvanostatic charge/discharge techniques. Hydrousmanganese dioxide nanostructures obtained from a basic solution exhibited a capacitance of262 F g − 1 at a currentdensity of 250 mA g − 1 and a capacitive retention of 75% after 1200 cycles, suggesting that this is apromising electrode material for supercapacitors. The high specific capacitanceis attributed to the hydrous nature coupled with a high surface area (181 m2 g − 1) of the manganese dioxide nanostructure.

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