N-rGO/NiCo 2 O 4 nanocomposite for high performance supercapacitor applications

Spinel structured transition metals oxide GO/NiCo 2 O 4 nanocomposites and nitrogen doped N-rGO/NiCo 2 O 4 nanocomposites were developed. Powder X-ray diffraction investigations confirmed the structure. The bonding vibrations of the produced nanocomposites were confirmed using infrared and Raman spectroscopy. EDX analysis was used to determine the composition and element weights of the nanocomposites. The electrochemical properties of the nanomaterials were measured using 1 M KOH electrolyte. At 5mVs −1 scan rates, cyclic voltammetry revealed a specific capacitance ( C sp ) of 1078.2 Fg −1 for N-rGO/NiCo 2 O 4 . The bare and nanocomposites of NiCo 2 O 4 , GO/NiCo 2 O 4 , and N-rGO/NiCo 2 O 4 specific capacitance, charge-discharge capability, and cyclic stability were investigated. Energy density and power density of the N-rGO/NiCo 2 O 4 nanocomposite were estimated to be 20.4 Wh kg −1 and 1300 W kg −1 , respectively. N-rGO//N-rGO/NiCo 2 O 4 asymmetric supercapacitor device with E d of 14.9 Wh kg −1 and P d of 3500 W kg −1 was fabricated.