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Citation: LUO Jian-Min, LI Juan, ZHANG Xiao-Gang, GAO Bo. Preparation and Electrochemical Capacitance of α-MnO₂ Microspheres[J]. Chinese Journal of Applied Chemistry, ;2007, 24(8): 949-952. shu

Preparation and Electrochemical Capacitance of α-MnO₂ Microspheres

LUO Jian-Min ^a ,
LI Juan ^a ,
ZHANG Xiao-Gang ^a,b,, ,
GAO Bo ^a

1.
a Institute of Applied Chemistry, Xinjiang University, Urumqi 830046;
2.
b College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016

Corresponding author: ZHANG Xiao-Gang,
Received Date: 22 September 2006
Available Online: 30 December 2006
Fund Project: 国家自然科学基金资助项目(20403014) (20403014)

MnO₂ with a high surface area of 177 m²/g as electrode for electrochemical capacitor was prepared with Ag foil as the catalyst at room temperature.The results of XRD and SEM showed that the MnO₂ is α-MnO₂ microspheres with cactus-like morphology composed of nanofibres.AC impedances,cyclic voltammetry and constant current charge-discharge tests indicated that α-MnO₂ microspheres had an excellent electrochemical capacitance with the highest capacitance of 187.1 F/g and retained 90% of the initial capacity over 1 000 cycles within the potential range of 0~0.8 V versus SCE in 1 mol/L Na₂SO₄.
- manganese dioxide,
- microsphere,
- electrochemical capacitance
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Preparation and Electrochemical Capacitance of α-MnO₂ Microspheres