Abstract
Nanostructured MnO2 materials were prepared in a micro-emulsion medium using sodium dodecyl sulfate (SDS）as a surfactant by a redox reaction between potassium permanganate and aniline. The morphologies of the obtained MnO2 were critically dependent on the concentrations of SDS. The particle sizes varied with the change in the micro-emulsion medium. The optimized properties of MnO2 material obtained with the surfactant concentration of 0.2 mol.L-1 had a specific surface area of 228.2 m2.g-1, and delivered a specific capacitance of 237 F.g -1 in 1 mol.L-1 Li2SO4. Additionally, a reversible Li-ion intercalation reaction occurred in the MnO2 calcined at 350 oC.
Graphical Abstract
Keywords
micro-emulsion method, pseudo-capacitance, nanostructured MnO2, intercalation reaction, surpercapacitor
Publication Date
2012-08-28
Online Available Date
2012-02-29
Revised Date
2012-02-24
Received Date
2011-11-19
Recommended Citation
Wen WU, Dan-Dan ZHOU, Meng-Yan HOU, Yong-Yao XIA.
Preparation and Electrochemical Performance of Nanostructured MnO2 Materials[J]. Journal of Electrochemistry,
2012
,
18(4): Article 2.
DOI: 10.61558/2993-074X.2919
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol18/iss4/2
References
[1] Srinivasan V, Weinder J W. Studies on the capacitance of nickel oxide films: Effect of heating temperature and electrolyte concentration[J]. Journal of the Electrochemical Society, 2000, 147(3): 880-885.
[2] Lin C, Ritter J A, Popov B N. Characterization of sol-gel-derived cobalt oxide xerogels as electrochemical capacitors[J]. Journal of the Electrochemical Society, 1998, 145(12): 4097-4103.
[3] Hu C C, Tsou T W. The optimization of specific capacitance of amorphous manganese oxide for electrochemical supercapacitors using experimental strategies[J]. Journal of Power Sources, 2003(1), 115: 179-186.
[4] Wu M Q, Snook G A, Chen G Z, et al. Redox deposition of manganese oxide on graphite for supercapacitors[J]. Electrochemistry Communications, 2004, 6(5): 499-504.
[5] Reddy R N, Reddy R G. Sol-gel MnO2 as an electrode material for electrochemical capacitors[J]. Journal of Power Sources, 2003, 124(1): 330-337.
[6] Toupin M, Brousse T, Belanger D. Charge storage mechanism of MnO2 electrode used in aqueous electrochemical capacitor[J]. Chemistery of Materials, 2004, 16(16): 3184-3190.
[7] Zheng J P, Jow T R. A new charge storage mechanism for electrochemical capacitors[J]. Journal of the Electrochemical Society, 1995, 142(1): L6-L8.
[8] Subramanian V, Zhu H W, Vajtai R, et al. Hydrothermal synthesis and pseudocapacitance properties of MnO2 nanostructures[J]. Journal of Physical Chemistry B, 2005, 109(43): 20207-20214.
[9] Long J W, Young A L, Rolison D R. Spectroelectrochemical characterization of nanostructured mesoporous manganese oxide in aqueous electrolytes[J]. Journal of the Electrochemical Society, 2003, 150(9): A1161-A1165.
[10] Moore T E, Ellis M, Selwood P W. Solid oxides and hydroxides of manganese[J]. Journal of the American Chemical Society, 1950, 72(2): 856-866.
[11] Pang S C, Anderson M A, Chapman T W. Novel electrode materials for thin-film ultracapacitors: Comparison of electrochemical properties of sol-gel-derived and electrodeposited manganese dioxide[J]. Journal of the Electrochemical Society, 2000, 147(2): 444-450.
