Abstract:
To address energy crises via expertly designing supercapacitors, researchers considered transition
metal oxides as possible options due to their outstanding capacitive capabilities. A sophisticated
approach has been adopted to tailor their characteristics by incorporating 3d ions into their
structures. Here, we synthesized pure Fe2O3 and Ni1-xMnxFeO3(x=0,0.3,0.5,0.7,1) via simple
hydrothermal method and investigated the impact of gradually substituting of Mn on the structural,
electronic, and electrochemical properties of iron oxide (Fe2O3). The XRD and Raman confirmed
the single-phase Hematite's rhombohedral crystal structure. SEM analysis demonstrated a change
in the morphology of nanostructures, transitioning from spherical- to nano-rod structures.
Thorough investigations into the electrochemical properties of the synthesized Ni1-xMnxFeO3
nanoparticles showcased distinctive traits resembling battery-type materials with super capacitive
performance. Notably, comprehensive cyclic voltammetry (CV) and Galvanostatic Charge
Discharge (GCD) examinations unveiled that the Ni1-xMnxFeO3 nanoparticles exhibited an
escalation in specific capacitance from 633 F/g to 1251 F/g with higher Mn content. This increase
culminated in the highest specific capacitance of 1,251 F/g for MnFeO3 nanoparticles under the
current density of 1 A/g. This achievement was with remarkable charge retention (96%), while
electrochemical impedance spectroscopy (EIS) demonstrated a notably conductive nature. The
noteworthy capacitance and robust stability of the MnFeO3 nanorods suggest their potential
suitability as candidates for supercapacitors.
