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2015 MRS Spring Meeting


S6.11 - From Micro-Supercapacitor to Pseudo Capacitor Based on Functionalized Silicon Nanowires Electrodes


Apr 9, 2015 11:45am ‐ Apr 9, 2015 12:00pm

Description

Supercapacitor integration in micro-electronic circuits should improve portable devices efficiency1 and work easier with silicon (Si) electrodes. In our previous works we have reported highly doped Si nanowire (SiNW) micro-supercapacitor (�-SC) electrodes showing quasi ideal capacitive behavior2,3. In this work we studied the functionalization of highly doped SiNW to improve the SCs properties by increasing the electrochemical window and/or by changing the charge storage mechanism. Within this context, supercapacitors are classified mainly in electrochemical double layer capacitors (EDLCs) while the pseudo-capacitors require redox reactions or electrochemical faradic reactions (slower than EDLCs). The latter allow an increase in the charge accumulation compared to EDLCs. SiNWs are grown by VLS mechanism via gold catalysis in a CVD reactor, using highly doped Si as a substrate. The performance of the �-SC electrodes was analysed by electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge cycles using an aprotic ionic liquid PYR13 TFSI ( IOLITEC, Germany) as electrolyte4. Two functionalizations are realized; i) electrodeposition PEDOT films in the presence of PYR13 TFSI, ii) coating with nanocrystalline diamond (NCD) thin films (

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