348389 Carbon Electrode Materials for Electrochemical Capacitors

Monday, November 4, 2013
Grand Ballroom B (Hilton)
Emily Campion1, Emery Brown2, Arjun Nepal3, C. M. Sorensen3 and Jun Li2, (1)Chemical Engineering, University of Minnesota Duluth, Duluth, MN, (2)Chemistry, Kansas State University, Manhattan, KS, (3)Physics, Kansas State University, Manhattan, KS

Improvement in electrical energy storage devices has resulted in smaller devices that hold more energy.  Electric double layer capacitors are one type of electrical energy storage device which stores energy in the form of charge at the electrode-electrolyte interface. We tested four types of carbon electrode materials, including single-walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs), commercial graphene, and detonated graphene, to determine which material had the maximum specific capacitance. Detonated graphene was prepared by Arjun Nepal of Kansas State University by combustion of oxygen and acetylene gases in a reactor at temperatures near 4000K. These materials were pressed into pellets and assembled into a double layer capacitor in a Swagelok© electrochemical cell with 1.0 M Na2SO4 as the electrolyte. Cyclic voltammetry and chronopotentiometry tests were carried out to characterize the energy storage properties. We found the specific capacitance to be linearly proportional to the specific surface area of the electrode material. Commercial graphene had the largest specific surface area (510m2/g) and specific capacitance of 7.41 F/g.

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