Structural, Spectral, and Electrochemical Investigations of a Nitrogen‐Doped N‐rGO/MgCo ₂ O ₄ Nanocomposite for Supercapacitor Applications

Abstract The hybrid nitrogen doped N‐rGO/MgCo 2 O 4 nanocomposite was studied for supercapacitor electrodes. Hydrothermal and reflux process was adopted for N‐rGO and for nanocomposite respectively. GO/MgCo 2 O 4 , MgCo 2 O 4 physical and chemical properties were used to compare to understand the enhancements made by nitrogen doping. Phase purity of N‐rGO/MgCo 2 O 4 , GO/MgCo 2 O 4 nanocomposites and MgCo 2 O 4 were studied. Raman and FTIR spectra were used to confirm the reduction of graphene oxide, nitrogen doping in N‐rGO and its nanocomposites. SEM and EDX analysis revealed the morphology and the elements in the synthesized nanomaterials. The electrochemical performance of all the nanocomposites were studied in 1 M KOH electrolyte. Cyclic voltammetry, charge‐discharge, impedance spectra, cyclic stability of N‐rGO/MgCo 2 O 4 , GO/MgCo 2 O 4 , MgCo 2 O 4 results have been discussed. The energy and power density have been compared. N‐rGO//N‐rGO/MgCo 2 O 4 asymmetric supercapacitor device was fabricated and studied. It exhibits an energy, power density of 3750 Wh Kg −1 , 28.3 W Kg −1 and the results have been presented.