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Citation: PANG Xu, MA Zheng-Qing, ZUO Lie. Sn Doped MnO₂ Electrode Material for Supercapacitors[J]. Acta Physico-Chimica Sinica, ;2009, 25(12): 2433-2437. doi: 10.3866/PKU.WHXB20091211 shu

Sn Doped MnO₂ Electrode Material for Supercapacitors

1.
College of Material Science and Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 26 May 2009
Available Online: 27 October 2009

Tin doped MnO2 was synthesized by chemical co-precipitation method to be used as an electrode material for supercapacitors. The morphology and structure of the products were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) spectrometry. Results showed that the products were made up of 200-500 nm spherical particles formed with 10 nm (diameter) by 100 nm (length) nanorods. And the crystallographic structure of MnO2 was the poorly crystallized δ-type. Cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS), and galvanostatic charge-discharge tests indicated that the ratio of tin in the products had great effect on the electrochemical capacity. A specific capacitance of 293 F·g-1 was obtained when the molar ratio ofMn to Sn was 50:1, which was 64.6%higher than that of the undoped material. After 600 charge-discharge cycles, the specific capacitance stabilized at 275 F·g-1, exhibiting favorable capacitance retention ability.
- Supercapacitor,
- Manganese dioxide,
- Dope,
- Stannumdioxide,
- Electrode material
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沈阳化工大学材料科学与工程学院沈阳 110142

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Sn Doped MnO₂ Electrode Material for Supercapacitors