Composite Electrodes for Electrochemical Supercapacitors

• DOI: 10.1007/s11671-009-9518-0
• Publication Date: 2010-01-06T11:28:56Z
• Authors: Jun Li; Quan Min Yang; Igor Zhitomirsky
• Keywords: Horizontal scan rate; Nanochemistry

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