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Acta Physico-Chimica Sinica  2011, Vol. 27 Issue (06): 1424-1430    DOI: 10.3866/PKU.WHXB20110611
ELECTROCHEMISTRY AND NEW ENERGY     
Preparation of Manganese Dioxide for Electrodes of Supercapacitors Based on Duplex Stainless Steel
LI Zhao, XU Ju-Liang, LI Xu-Yan, GUO Li-Fang, LI Jin, JIANG Yi-Ming
Department of Materials Science, Fudan University, Shanghai 200433, R. P. China
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Abstract  

A nano-structured manganese dioxide thin film was electrochemically deposited onto a 2304 duplex stainless steel (DSS) electrode. The structure, surface morphology, and composites of the obtained manganese dioxide were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS), respectively. The electrochemical characteristics of the manganese dioxide electrodes were investigated by cyclic voltammetry (CV), chronopotentiometry, and electrochemical impedance spectroscopy (EIS). The obtained manganese dioxide was found to be amorphous and the surface was composed of nanorods with lengths between 100 and 200 nm. As the mass of the manganese dioxide increased the capacitance also increased while the specific capacitance decreased. With an increase in the CV scan rate the specific capacitance decreased as well. The highest specific capacitance value of 288.9 F·g-1 was obtained at a scan rate of 20 mV·s-1 when the mass of manganese dioxide was 0.09 mg. 500 cycles were carried out at a rate of 100 mV·s-1 and we found that the specific capacitance remained stable and even increased slightly as the cycles increased.



Key wordsSupercapacitor      MnO2      Electrodeposition      Specific capacitance      Electrode material     
Received: 07 January 2011      Published: 25 April 2011
MSC2000:  O646  
Fund:  

The project was supported by the Shanghai Natural Science Foundation, China (09ZR1402600), Shanghai Science and Technology Development Key Research Funds, China (09JC1401600), Shanghai High and New Technology′s Industrialization Project and FDUROP, China.

Corresponding Authors: JIANG Yi-Ming     E-mail: corrosion@fudan.edu.cn
Cite this article:

LI Zhao, XU Ju-Liang, LI Xu-Yan, GUO Li-Fang, LI Jin, JIANG Yi-Ming. Preparation of Manganese Dioxide for Electrodes of Supercapacitors Based on Duplex Stainless Steel. Acta Physico-Chimica Sinica, 2011, 27(06): 1424-1430.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20110611     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2011/V27/I06/1424

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