Abstract
Nanostructured porous films of carbon with density of about 0.5 g/cm3 and 200 nm thickness were deposited at room temperature by supersonic cluster beam deposition (SCBD) from carbon clusters formed in the gas phase. Carbon film surface topography, determined by atomic force microscopy, reveals a surface roughness of 16 nm and a granular morphology arising from the low kinetic energy ballistic deposition regime. The material is characterized by a highly disordered carbon structure with predominant sp2 hybridization as evidenced by Raman spectroscopy. The interface properties of nanostructured carbon electrodes were investigated by cyclic voltammetry and electrochemical impedance spectroscopy employing KOH 1 M solution as aqueous electrolyte. An increase of the double layer capacitance is observed when the electrodes are heat treated in air or when a nanostructured nickel layer deposited by SCBD on top of a sputter deposited film of the same metal is employed as a current collector instead of a plain metallic film. This enhancement is consistent with an improved charge injection in the active material and is ascribed to the modification of the electrical contact at the interface between the carbon and the metal current collector. Specific capacitance values up to 120 F/g have been measured for the electrodes with nanostructured metal/carbon interface.
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Acknowledgments
We thank M. Galluzzi for AFM characterization and M. Marino for discussions. This work has been supported by the VII FP EU project NANOTOTOUCH and by Fondazione CARIPLO under contract 2010-0588.
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Bettini, L.G., Bardizza, G., Podestà, A. et al. Electrochemical impedance spectroscopy on nanostructured carbon electrodes grown by supersonic cluster beam deposition. J Nanopart Res 15, 1429 (2013). https://doi.org/10.1007/s11051-013-1429-4
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DOI: https://doi.org/10.1007/s11051-013-1429-4