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Ultracapacitors Based on Graphene/MWNT Composite Films

Published online by Cambridge University Press:  11 July 2011

Wei Wang
Affiliation:
Materials Science & Engineering, University of California, Riverside, Riverside, CA, U. S. A.
Shirui Guo
Affiliation:
Chemistry, University of California, Riverside, CA, U. S. A
Jiebin Zhong
Affiliation:
Mechanical Engineering, University of California, Riverside, CA, U. S. A
Jian Lin
Affiliation:
Mechanical Engineering, University of California, Riverside, CA, U. S. A
Mihrimah Ozkan
Affiliation:
Materials Science & Engineering, University of California, Riverside, Riverside, CA, U. S. A. Electrical Engineering, University of California, Riverside, CA, U. S. A
Cengiz Ozkan
Affiliation:
Materials Science & Engineering, University of California, Riverside, Riverside, CA, U. S. A. Mechanical Engineering, University of California, Riverside, CA, U. S. A
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Abstract

Ultracapacitors are promising candidate for alternative energy storage applications since they can store and deliver energy at relatively high rates. In this work, we integrated large area CVD graphene with multi-walled carbon nanotubes (MWNTs) to fabricate highly conductive, large surface-area composite thin films used as electrodes in ultracapacitors. Uniform, large area graphene layers were produced by CVD on copper foils and were chemically modified. Chemically shortened MWNTs, ranging in length of 200~500 nm, were deposited by dropping on graphene layers. Graphene/MWNT composite films with different thicknesses were obtained. The surface morphology was investigated by SEM. The results demonstrated relatively dense and homogeneous net nanostructure. The measurements of cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy (EIS) are conducted to determine its performance of graphene/MWNT film structures.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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