The fabrication of a planar supercapacitor based on cluster-assembled nanostructured carbon (ns-C) thin films deposited by supersonic cluster beam deposition and ionic liquid as electrolyte has been demonstrated. Cluster-assembled carbon has a density of about 0.5 g/cm3 and a highly disordered structure with predominant sp2 hybridization, high surface roughness and granular nanoscale morphology. The electric double layer capacity of ns-C films (thickness variable in the range of 140–500 nm) was investigated by electrochemical impedance spectroscopy and cyclic voltammetry employing four different hydrophobic room-temperature ionic liquids featuring the same anion and with different cations as electrolyte. Evidence of good impregnation of the ns-C nanoporous matrix by the different ionic liquids was found. The highest EDL capacity, 75 F/g, was obtained by using [Bmim][NTf2], the ionic liquid with the shortest alkyl chain. Using [Bmim][NTf2] a supercapacitor with single electrode area of 0.2 cm2 and specific capacity of ∼80 μF/cm2 was obtained.

Planar thin film supercapacitor based on cluster-assembled nanostructured carbon and ionic liquid electrolyte / L. G. Bettini, M. Galluzzi, A. Podestà, P. Milani, P. Piseri. - In: CARBON. - ISSN 0008-6223. - 59(2013 Aug), pp. 212-220.

Planar thin film supercapacitor based on cluster-assembled nanostructured carbon and ionic liquid electrolyte

L. G. Bettini
Primo
;
M. Galluzzi
Secondo
;
A. Podestà;P. Milani
Penultimo
;
P. Piseri
2013

Abstract

The fabrication of a planar supercapacitor based on cluster-assembled nanostructured carbon (ns-C) thin films deposited by supersonic cluster beam deposition and ionic liquid as electrolyte has been demonstrated. Cluster-assembled carbon has a density of about 0.5 g/cm3 and a highly disordered structure with predominant sp2 hybridization, high surface roughness and granular nanoscale morphology. The electric double layer capacity of ns-C films (thickness variable in the range of 140–500 nm) was investigated by electrochemical impedance spectroscopy and cyclic voltammetry employing four different hydrophobic room-temperature ionic liquids featuring the same anion and with different cations as electrolyte. Evidence of good impregnation of the ns-C nanoporous matrix by the different ionic liquids was found. The highest EDL capacity, 75 F/g, was obtained by using [Bmim][NTf2], the ionic liquid with the shortest alkyl chain. Using [Bmim][NTf2] a supercapacitor with single electrode area of 0.2 cm2 and specific capacity of ∼80 μF/cm2 was obtained.
double-layer capacitor; electrochemical capacitors; beam deposition; impedance spectroscopy; high-temperature; performance; nanotubes; storage; energy
Settore FIS/03 - Fisica della Materia
Centro Interdisciplinare Materiali ed Interfacce Nanostrutturati - CIMAINA
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/221448
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