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

David Aradilla 1, 2 P. Gentile 1 Gérard Bidan 3 Vanesa Ruiz 4 Pedro Gómez-Romero 4 Thomas J.S. Schubert Hülya Sahin Elzbieta Frackowiak 5 Saïd Sadki 2
1 SiNaps - Silicon Nanoelectronics Photonics and Structures
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
2 SPRAM - UMR 5819 - Structures et propriétés d'architectures moléculaire
3 INAC - Institut Nanosciences et Cryogénie
4 ICN2 - ICN2 - Institut Catala de Nanociencia i Nanotecnologia
5 Faculty of Chemical Technology
Abstract : This work describes the development and performance of a symmetric microsupercapacitor 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 182 mW cm-2 and a specific energy of 190 µJ cm-2 operating at a wide cell voltage of 4V with a quasi-ideal capacitive behaviour. 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 1 mA cm-2. Furthermore, a coulombic efficiency of approximately 99 % was obtained after galvanostatic cycling test without structural degradation on the morphology of SiNWs.
keyword : ionic liquids Silicon nanowires micro-supercapacitors electrochemical energy storage chemical vapor deposition
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Submitted on : Tuesday, July 29, 2014 - 3:11:09 PM
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David Aradilla, P. Gentile, Gérard Bidan, Vanesa Ruiz, Pedro Gómez-Romero, et al.. High performance of symmetric micro supercapacitors based on silicon nanowires using N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide as electrolyte. 2014. ⟨cea-01053082⟩

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