Synergistic Effects of rGO and Mg–Mn Co‐Doping on the Electrochemical Performance of Zinc Ferrite‐Based Supercapacitors

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Abstract
Developing high‐performance energy storage devices is essential to meet the rising energy demands. The present work demonstrates the improved electrochemical properties of rGO/ZFO by Mg, Mn codoping approach. The incorporation of rGO (reduced graphene oxide) with dual‐doped zinc ferrite significantly improves charge storage behavior, thereby enhancing the capacitance. The doping of Mg and Mn is ensured by X‐ray diffraction (XRD), while Brunauer–Emmett–Teller (BET) shows the enhanced surface area due to doping. Dielectric permittivity ( ε ) and tangent loss (tan δ ) were analyzed over different frequency ranges. Electrochemical performance was evaluated using both three‐electrode and symmetric coin‐cell (SCC) configurations. In the 3‐electrode system, the specific capacitance ( C sp ) was found to be 157.39 and 376.68 F g −1 while corresponding SCC devices deliver 68.17 and 90.57 F g −1 at 1 mV s −1 . The energy density ( E D ) and powder density ( P D ) was 8.22 and 14.26 Wh kg −1 and 28.7 and 28.8 W kg −1 at 0.04 A g −1 for rGO/ZFO and Mg, Mn doped rGO/ZFO SCC, respectively. Moreover, the Mg, Mn doped rGO/ZFO SCC device shows an exceptional capacitance retention of 96% after 10 000 cycles at 0.4 A g −1 . These results highlight the effectiveness of dual doping and rGO incorporation in advancing zinc ferrite‐based supercapacitors (SCs).

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