Sol–Gel synthesis of Co3O4 nanoparticles as an electrode material for supercapacitor applications

Cobalt Oxide (Co 3 O 4 ) nanoparticles were synthesized with an aid of urea by sol–gel method. The results of X-ray diffraction revealed that the formation of face-centered cubic (Fd3m) structure and the average crystallite size of the product were found to be 13.76 nm. The formation of cobalt oxide is confirmed by FT-IR analysis. The results of HR-TEM images reveal that Co 3 O 4 nanoparticles were found to have within the range of 13–15 nm. At 3 M KOH, electrochemical analyses were investigated with impedance spectroscopy and an intrinsic pseudo capacitance and the results were reported. The results of Galvanostatic charge-discharge (GCD) tests revealed the capacitive properties of Co 3 O 4 with the highest specific capacitance of 761.25 F g −1 . Highlights The specific capacitance of Co 3 O 4 nanoparticles was found to be 761.25 F g −1 at 11 mA/cm 2 current density. The Co 3 O 4 nanoparticles were synthesized by a simple sol–gel method. The crystallite size of Co 3 O 4 nanoparticles was found to be 13.76 nm.