Chemical synthesis of Co3O4 nanowires for symmetric supercapacitor device

In present work, Co3O4 nanowire is successfully prepared on stainless steel substrate by simple chemical bath deposition method and studied the supercapacitor application. The prepared Co3O4 nanowire is analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy and Brunauer–Emmett–Teller techniques. Co3O4 nanowire offers high specific surface area of 66.33 m2 g−1 for the intercalation of electrolyte ions. Co3O4 nanowires exhibit outstanding electrochemical performance with a high specific capacitance of 850 F g−1 at scan rate of 5 mV s−1, and excellent long-term cycling stability (86% over 5000 CV cycles). The symmetric solid-state supercapacitor device is fabricated by accumulating two electrodes of Co3O4 nanowire, which shows superior electrochemical performance with specific capacitance of 127 F g−1, specific energy of 24.18 Wh kg−1 and excellent cycling stability (85% over 3000 CV cycles).