Fabrication of Mn doped BiFeO3 as an electrode material for supercapacitor applications

Abstract

Currently, supercapacitors (SCs) often recognized as electrochemical capacitor are category of energy storage devices that attained considerable attention from researchers. Perovskite materials exhibit significant potential in addressing global energy crisis concerns and act as effective electrode material for SCs application. The perovskite (bismuth ferrite) and manganese-doped (Mn-BiFeO3) nanocomposites were synthesized through the utilization of the hydrothermal method. This synthesis was conducted with the intention of exploring the potential performance of nanocomposites in the energy storage for the supercapacitor (SCs) application. In this work, scanning electron microscopy (SEM) was utilized to recognize the morphology of BiFeO3 nanoparticles incorporated in the transition metal (Mn). The EDX analysis confirmed the fabricated sample was pure and without any impurity. The investigation conducted on the Mn-BiFeO3 nanocomposites in the BET study has confirmed a notable surface area of around 49 m2 g−1. The investigation of energy storage applications involved the utilization of 2 M KOH electrolyte for conducting galvanic charge-discharge (GCD), cyclic voltammetry (CV) studies and electrochemical impedance spectroscopy (EIS). The nanocomposites consisting of BiFeO3-Mn have excellent specific capacitance (Cs) values of around 1795 F g−1 when tested at 1 A g−1, demonstrating best charge-discharge cyclic behavior; the computed values of both solution resistance Rs (1.08 Ω) and charge transfer resistance Rct (0.02 Ω) was calculated by the EIS graph. Our research findings demonstrate a method for synthesizing nanocomposites from the hydrothermal method that is efficient and scalable while also being cost-effective. These nanocomposites exhibit improved electrochemical performance, making them suitable for use for SCs applications and can used towards further energy storage devices.