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| Preparation and electrochemical properties of α-MnO2 |
| LI Zhe， LI Tao |
| School of Aeronautical Machinery Manufacturing， Changsha Aeronautical Vocational and Technical College， Changsha 410124， China |
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Abstract Electrode material of MnO2 microspheres were synthesized via a simple liquid phase co-precipitation method by using K2S2O8 and MnSO4·H2O as raw material. The products were characterized by XRD and SEM. Results show that the α-MnO2 in tetragonal system with obvious nanothorn structure are obtained under the conditions of pH value of l，reaction temperature of 60 ℃ and reaction time of 22 h. The obtained α-MnO2 was then applied as the electrode material for supercapacitors， with 6 mol/L KOH as electrolyte solution， the electrochemical characterization was carried out using galvanostatic charge-discharge cycling， cyclic voltammetry and impedance spectroscopy. Its specific capacitance is 156.0 F/g at the scanning rate of 5 mV/s.
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Received: 20 January 2016
Published: 15 December 2016
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2016, Vol. 26 
