Structural and Electrochemical Study of Dandelion-Like Manganese Dioxide Synthesized by a New Microwave Hydrothermal Method

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 1516-1519
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.1516
• Online since: May 2011
• Authors: Jian Ling Li, Yi Tuo Wang, Ya Kun Zhang, Gui Mei Han, Fei Gao, Xin Dong Wang

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