Nano Archive

Composite Electrodes for Electrochemical Supercapacitors

Li, Jun and Yang, Quan Min and Zhitomirsky, Igor (2010) Composite Electrodes for Electrochemical Supercapacitors. NANOSCALE RESEARCH LETTERS, 5 (3). pp. 512-517. ISSN 1931-7573 (Print) 1556-276X (Online)

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Official URL: http://www.springerlink.com/content/22p3124j8112j1...

Abstract

Manganese dioxide nanofibers with length ranged from 0.1 to 1 μm and a diameter of about 4–6 nm were prepared by a chemical precipitation method. Composite electrodes for electrochemical supercapacitors were fabricated by impregnation of the manganese dioxide nanofibers and multiwalled carbon nanotubes (MWCNT) into porous Ni plaque current collectors. Obtained composite electrodes, containing 85% of manganese dioxide and 15 mass% of MWCNT, as a conductive additive, with total mass loading of 7–15 mg cm−2, showed a capacitive behavior in 0.5-M Na2SO4 solutions. The decrease in stirring time during precipitation of the nanofibers resulted in reduced agglomeration and higher specific capacitance (SC). The highest SC of 185 F g−1 was obtained at a scan rate of 2 mV s−1 for mass loading of 7 mg cm−2. The SC decreased with increasing scan rate and increasing electrode mass.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Technology > Nanotechnology and energy applications
ID Code:8786
Deposited By:M T V
Deposited On:21 Apr 2010 14:55
Last Modified:21 Apr 2010 14:55

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