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

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• 作者：Luca Giacomo Bettini ; Massimiliano Galluzzi ; Alessandro Podestà ; Paolo Milani ; Paolo Piseri ; ^{paolo.piseri@unimi.it} ; ^{paolo.piseri@fisica.unimi.it}
• 刊名：Carbon
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：59
• 期：Complete
• 页码：212-220
• 全文大小：1396 K

文摘

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 ¦ÌF/cm² was obtained.