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High performance of symmetric micro-supercapacitors based on silicon nanowires using N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide as electrolyte

AuthorsAradilla, David; Gentile, Pascal; Bidan, Gérad; Ruiz Ruiz, Vanesa ; Gómez-Romero, P. ; Schubert, Thomas J. S.; Sadki, Saïd
KeywordsChemical vapor deposition
Ionic liquids
Electrochemical energy storage
Silicon nanowires
Issue Date2014
CitationNano Energy 9: 273-281 (2014)
AbstractThis work describes the development and performance of a symmetric micro-supercapacitor made of nanostructured electrodes based on silicon nanowires (SiNWs) deposited using chemical vapor deposition (CVD) on silicon substrates. The performance of the SiNWs micro-supercapacitor employing an aprotic ionic liquid (N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide) (PYR13TFSI) as an electrolyte was able to deliver a maximal power density of 182mWcm-2 and a specific energy of 190μJcm-2 operating at a wide cell voltage of 4V with a quasi-ideal capacitive behavior. The lifetime of the device exhibited a remarkable electrochemical stability retaining 75% of the initial capacitance after several million galvanostatic charge-discharge cycles at a high current density of 1mAcm-2. Furthermore, a coulombic efficiency of approximately 99% was obtained after galvanostatic cycling test without structural degradation on the morphology of SiNWs.
Identifiersdoi: 10.1016/j.nanoen.2014.07.001
issn: 2211-2855
Appears in Collections:(CIN2) Artículos
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