Charge storage properties of SiNWs grown by hot-wire chemical vapor process technique as electrodes in electrochemical capacitors

Silicon nanowires (SiNWs) synthesized by Hot-Wire Chemical Vapor Process (HWCVP) via vapor-liquid-solid mechanism are explored as electrodes for supercapacitor application. The electrochemical properties of SiNWs in two electrode configuration were evaluated by galvanostatic charge/discharge test and cyclic voltammetry at different scan rates. A specific capacitance of 800 μF/cm² at 10 mV/sec scan rate is obtained and the capacitive behavior is maintained even at higher scan rates. All electrochemical measurements were carried out in 1M Na₂SO₄ aqueous electrolyte. Scanning Electron Microscopy was also employed for characterization of SiNWs morphology.