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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Manganese dioxide nanofibers with length ranged from 0.1 to 1Â Î¼m and a diameter of about 4â6Â 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 7â15Â mgÂ cmâ2, 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 185Â FÂ gâ1 was obtained at a scan rate of 2Â mVÂ sâ1 for mass loading of 7Â mgÂ cmâ2. The SC decreased with increasing scan rate and increasing electrode mass.
|Subjects:||Material Science > Functional and hybrid materials|
Technology > Nanotechnology and energy applications
|Deposited By:||M T V|
|Deposited On:||21 Apr 2010 14:55|
|Last Modified:||21 Apr 2010 14:55|
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