Design, Fabrication, and Characterization of Hematite (α-Fe2O3) Nanostructures

The influence of processing parameters on the physicochemical properties of hematite α-Fe 2 O 3 nanostructures was investigated. X-ray diffraction results revealed the hematite phase rhombohedral structure. Scanning electron microscope results explored nanospheres, nanohexagonal platelets, nanoellipsoids, distorted nanocubes, and interconnected platelets nanostructures. Rhombohedral single-phase hematite was confirmed through five Raman active modes. 2 P 3/2 (1) → 2 P 1/2 transition in photoluminescence spectra and Fourier-transform infrared spectroscopy band observed at ~ 555 cm −1 revealed the hematite formation. The highest specific capacitance value of 151.09 F/g for scan rate of 10 mV/s was obtained for the hydrothermal-assisted product using an Fe(NO 3 ) 2 ·9H 2 O precursor in KOH electrolyte solutions.