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Designing 3D multihierarchical heteronanostructures for high-performance on-chip hybrid supercapacitors: Poly(3,4-(ethylenedioxy)thiophene)-coated diamond/silicon nanowire electrodes in an aprotic ionic liquid

: Aradilla, D.; Gao, F.; Lewes-Malandrakis, G.; Müller-Sebert, W.; Gentile, P.; Boniface, M.; Aldakov, D.; Iliev, B.; Schubert, T.J.S.; Nebel, C.E.; Bidan, G.


ACS applied materials & interfaces 8 (2016), Nr.28, S.18069-18077
ISSN: 1944-8244
ISSN: 0013-936X
ISSN: 1944-8252
Fraunhofer IAF ()
supercapacitor; diamond; conducting polymers; silicon nanowires; ionic liquids

A versatile and robust hierarchically multifunctionalized nanostructured material made of poly(3,4-(ethylenedioxy)thiophene) (PEDOT)-coated diamond@silicon nanowires has been demonstrated to be an excellent capacitive electrode for supercapacitor devices. Thus, the electrochemical deposition of nanometric PEDOT films on diamond-coated silicon nanowire (SiNW) electrodes using N-methyl-N-propylpyrrolidinium bis((trifluoromethyl)sulfonyl)imide ionic liquid displayed a specific capacitance value of 140 F g¯ (1) at a scan rate of 1 mV s¯ (1). The as-grown functionalized electrodes were evaluated in a symmetric planar microsupercapacitor using butyltrimethylammonium bis((trifluoromethyl)-sulfonyl)imide aprotic ionic liquid as the electrolyte. The device exhibited extraordinary energy and power density values of 26 mJ cm¯(2) and 1.3 mW cm¯(2) within a large voltage cell of 2.5 V, respectively. In addition, the system was able to retain 80% of its initial capacitance after 15 000 galvanostatic charge-discharge cycles at a high current density of 1 mA cm¯(2) while maintaining a Coulombic efficiency around 100%. Therefore, this multifunctionalized hybrid device represents one of the best electrochemical performances concerning coated SiNW electrodes for a high-energy advanced on-chip supercapacitor.