Structural, Spectral, and Electrochemical Investigations of a Nitrogen‐Doped N‐rGO/MgCo₂O₄ 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 nano-materials. 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 À 1 , 28.3 W Kg À 1 and the results have been presented.