Synergistic Effects of Ce Substitution on the Structural, Magnetic and Enhanced Electrochemical Properties of Nickel Manganese Spinel Ferrites (Ni0.3Mn0.7CexFe2-xO4)

초록

Nickel manganese spinel ferrites (Ni0.3Mn0.7CexFe2-xO4, x = 0.0, 0.01, 0.02, and 0.03) with substitution of cerium (Ce) were synthesized by a hydrothermal technique and investigated to determine how the substitution of Ce affected the physical properties of the material samples. The samples were characterized by various techniques including X-ray diffraction (XRD) to observe the structure of the prepared material, scanning electron microscopy (SEM) to study the morphology, and Fourier transform infrared (FTIR) spectroscopy to determine the bands within the samples. Additionally, vibrating-sample magnetometry (VSM) was applied to investigate the magnetic characteristics including remanent magnetization (M-r), saturation magnetization (M-s), and coercivity (H-c). The material was found to have a face-centered cubic (FCC), single-phase structure, confirmed by XRD. An increase in cerium concentration resulted in an increase in the lattice constant from 8.36 & Aring; to 8.61 & Aring;. SEM images showed agglomeration of the nanoparticles, which varied in size. The FTIR spectrum showed that light was absorbed at wavelengths of 500-4000 cm(-1). It was found that the band shifted toward a higher frequency when cerium content was added to the pure nickel manganese ferrites. As the scan rate increased, the specific capacitance decreased, and the loop area increased. The suitability of the synthesized material for use as an anode in storage devices was investigated via cyclic voltammetry (CV). The prepared samples were found to have specific capacitance of 578-892 F g(-1), estimated through galvanostatic charge-discharge (GCD) and CV measurements.

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