Facile Synthesis and Electrochemical Study of NiO-Cr2O3 /MWCNT’s/PANI Hybrid materiel as a High-Performance Supercapacitor Electrode Material

Abstract

The extended cyclic stability, high power densities, quick charging and discharging rates, and simplicity of use of supercapacitors have made them popular as energy storage devices. In this regard, efforts have been made to blend several materials to create a composite electrode for a high-performance supercapacitor. In the current work, a hybrid electrode material based on carbon nanotubes (MWCNTs), polyaniline (PANI), and nickel and chromium binary metal oxide (NiO Cr2O3) was synthesized. For the synthesis of metal oxide, hydrothermal preparation was used; however, in-situ polymerization was used for hybrid. Every synthetic material was examined using different characterization methods, including XRD, FTIR, TGA, EDX, and SEM. NiO Cr2O3/MWCNT/PANI electrode material demonstrated a high capacitive performance of 1961 F/g in 2M KOH electrolyte at 1 A/g. While electrochemical tests in 1 and 0.5M KOH electrolyte were also carried out and revealed capacitance of 1319 and 882 F/g respectively. NiO Cr2O3/MWCNT/PANI electrode, which demonstrated 99% coulombic efficiency, also produced 231.5 W/kg of power density at 58.38 W h/kg of Energy density. Additionally, the electrode's stability was examined, and it held 94.6% of its initial capacitance after 10,000 cycles. This higher performance is thought to be the result of the hybrid's enhanced structural stability and component synergy effects.