Structural and Electrochemical Study of Dandelion-Like Manganese Dioxide Synthesized by a New Microwave Hydrothermal Method
The microwave-hydrothermal method for synthesizing g-MnO2 has been investigated for the first time. The dandelion-like g-MnO2 active material with 1.0-5.0 μm in diameter was obtained from KBrO3 and MnSO4 via the novel method. Compared with traditional low-temperature hydrothermal method, this approach lowers the temperature by 30-40 °C, and shorts the reaction time 6-14 h. Electrochemical properties of dandelion-like γ-MnO2 were elucidated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy tests. The synthesized material shows a relative high specific capacitance, and the MnO2 obtained at the condition of 75 °C for 2 h shows the best electrochemical properties with a specific capacitance of 239.3 F·g-1 at the current density of 100 mA·g-1 in 6 M KOH electrolyte solution.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
J. L. Li et al., "Structural and Electrochemical Study of Dandelion-Like Manganese Dioxide Synthesized by a New Microwave Hydrothermal Method", Advanced Materials Research, Vols. 233-235, pp. 1516-1519, 2011