The electrochemical properties of small carbon nano-onions (CNOs, 6 to 8 shells) in the solid phase, non-modified, n-CNOs, and CNOs functionalized with carboxyclic acid groups, ox-CNOs were investigated by cyclic voltammetry. The redox properties of CNO films depend on the functionalization of carbon surface. The ox-CNOs are electrochemically active at the negative potentials due to the process of carboxylic groups reduction.

The preparation and characterization of CNOs composites with tetraoctyloammonium bromide (TOABr), chitosan (Chit) and diallydimethyloammonium chloride (DDA) as ionic dopands were performed. In all cases, the amount of CNOs in the film was the same. All  films exhibit typical capacitance behavior. The voltammograms show almost pseudo-rectangular cathodic and anodic profiles, a characteristic behavior for an ideal capacitor. In aqueous solutions, the n-CNO/TOABr films show behavior typical for an ideal double layer capacitor with the specific capacitance, close to 9.68 F g^-1. Capacitance currents obtained for CNOs/Chit and CNOs/DDA films are much higher in comparison to CNOs/TOABr layer.

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