Composites of electroactive fullerene-based polymer and carbon nanomaterials – good materials for supercapacitors
|Krzysztof Winkler 1, Emilia Grądzka|
1. University of Białystok, Institute of Chemistry, Hurtowa 1, Białystok 15-399, Poland
Thin films of composites of electroactive fullerene-based polymer and carbon nanomaterials (carbon nanotubes and carbon nano-onions) were electrochemically prepared by electrodeposition of polymer on the layer of carbon nanoparticles immobilized at the electrode surface. Processes of composites formation were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, piezoelectric microgravimetry and transmission electron microscopy.
The electrochemical properties of films depend on the carbon nanoparticles used for its formation and the film composition. Formed materials are electrochemically active in negative potential range due to the electroreduction of fullerene moieties. In this potential range, composites behaves as typical redox pseudo-capacitors. Much better capacitance properties were observed for films containing carbon nanotubes in comparison to composites of carbon nano-onions. A specific pseudo-capacitance up to 425 F g-1 was found for multiwall carbon nanotube/C60-Pd composite.
The presence of carbon nanomaterials makes the composite conductive also at potentials less negative than potentials of C60 electroreduction. The double-layer specific capacitance of this film is close to 40 F g-1.
Presentation: Short communication at SMCBS'2011 International Workshop, by Krzysztof Winkler
See On-line Journal of SMCBS'2011 International Workshop
Submitted: 2011-09-30 15:58 Revised: 2011-09-30 15:58