Transition-metal ions (Ni, Cu, and Zn) doped Mn3O4compounds: A facile synthesis and enhanced energy storage performance as supercapacitor
Abstract
This study investigates the structural and electrochemical performance of transition metal ion-doped M’-Mn3O4 (M’ = Cu, Ni, and Zn) prepared via a facile auto-combustion technique. The structural study, using XRD, XPS, and SEM, revealed the influence of dopant ions on altering the structural properties of single-phase Mn3O4 nanocrystals. The electrochemical performance of M’-Mn3O4 electrodes was evaluated using a three-electrode cell in a 1 M Na2SO4 electrolyte solution. Zn-Mn3O4 displayed the highest specific capacitance of 331 F/g at 20 mV/s, which is ∼21 % higher than that of pure Mn3O4 (230 F/g). Additionally, the Zn-Mn3O4 exhibited the highest energy density of 26.47 Wh/kg, whereas the Ni-Mn3O4 showed a maximum power density of up to 8612 W/kg. The maximum capacitive retention was observed to be nearly 96 % after 500 cycles for the Cu-Mn3O4 compound. The band gap energy decreased to 2.534 eV upon Zn doping in Mn3O4, compared to 2.697 eV for pure Mn3O4, further improving electrical conductivity. These results have verified the ability of doping to enhance the energy and power density performance of transition-metal-doped oxides. Therefore, doped Mn3O4 nanocrystals could be a promising candidate for high-capacity, low-cost, and environmentally friendly supercapacitor electrodes.
Publication Title
Ceramics International
Recommended Citation
Azim, F., Rahman, M., Brutger, J., Shen, X., Perez, F., Okoli, O., & Mishra, S. (2025). Transition-metal ions (Ni, Cu, and Zn) doped Mn3O4compounds: A facile synthesis and enhanced energy storage performance as supercapacitor. Ceramics International, 51 (28), 58887-58901. https://doi.org/10.1016/j.ceramint.2025.10.107
