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Novel hybrid micro-supercapacitor based on conducting polymer coated silicon nanowires for electrochemical energy storage

Aradilla, David, Bidan, Gérard, Gentile, Pascal, Weathers, Patrick, Thissandier, Fleur, Ruiz, Vanesa, Gómez-Romero, Pedro, Schubert, Thomas J. S., Sahin, Hülya, Sadki, Saïd
RSC advances 2014 v.4 no.50 pp. 26462-26467
capacitance, coatings, electric potential difference, electrochemistry, electrolytes, equipment, ionic liquids, nanowires, polymers, silicon, specific energy
The development of a novel hybrid symmetric micro-supercapacitor based on poly(3,4-ethylenedioxythiophene) coated silicon nanowires using an ionic liquid (N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide) as an electrolyte has been demonstrated. The hybrid supercapacitor device was able to deliver a specific energy of 10 W h kg⁻¹ and a maximal power density of 85 kW kg⁻¹ at a cell voltage of 1.5 V. The hybrid device exhibited long lifetime and an outstanding electrochemical stability retaining 80% of the initial capacitance after thousands of galvanostatic charge–discharge cycles at a high current density of 1 mA cm⁻². The improvement of the capacitive properties compared with the bare SiNWs was attributed to the pseudo-capacitive behavior induced by the conducting polymer coating.