Supercapacitive properties of ultra-fine MnO2 prepared by a solid-state coordination reaction

作者：Fang Dao Lai^*; Wu Bing Cai; Mao Ai Qin; Yan Yong; Zheng Cui Hong

来源：Journal of Alloys and Compounds, 2010, 507(2): 526-530.

DOI：10.1016/j.jallcom.2010.08.010

• Oxides
• Chemical synthesis
• Electrochemical measurements
• Electrochemical properties

An ultra-fine MnO2 powder was synthesized by a novel route of solid-state coordination reaction. The structure and morphology were characterized by X-ray diffraction, scanning electron microscope and infrared spectroscopy. The MnO2 powder with a primary particle size of 200 nm was composed of alpha-MnO2 and gamma-MnO2. Electrochemical properties of the MnO2 electrode were examined by cyclic voltammetry, and galvanostatic charge/discharge and electrochemical impedance spectroscopy measurements in 6 mol L-1 KOH electrolyte. The MnO2 electrode exhibited good supercapacitive performance. Specific capacitance values of 337 and 197 F g(-1) were obtained for the MnO2 electrode at scan rates of 2 and 50 mV s(-1), respectively. The MnO2 electrode subjected to 500 cycles at a current density of 800 mA g(-1) delivered a specific capacitance of 228 Fg(-1), retaining 75% of its initial specific capacitance.

• 出版日期2010-10-8
• 单位安徽工业大学