Document Type : Research Paper

Authors

• Alyaa H. Abdalsalam ¹
• Noor M. Saadoon ¹
• Ali A. Ati ²
• S. Dabagh ^{3, 4}
• A. A. Salim ⁵

¹ Nanotechnology and Advanced Materials Research Center, University of Technology, Baghdad, Iraq.

² Oil and Gas Engineering Department, University of Technology, Baghdad, Iraq.

³ Institute of Applied Physics “Nello Carrara”, National Research Council of Italy (CNR), Sesto Fiorentino, 50019, Italy.

⁴ Cellular Therapy and Stem Cell Production Application and Research Centre, ESTEM, Eskisehir Osmangazi University, Eskisehir, 26040, Turkey.

⁵ Laser Center & Physics Department, Faculty of Science, Universiti Teknologi Malaysia, Johor, Malaysia

Abstract

In the current study, three distinct synthesis techniques, the gel, co-precipitation, and solid-state method, were employed to synthesize (MgFe₂O₄)_x/ZnO_1-x hetero-nanocomposites with varying magnesium ferrite contents (x = 0.03%, 0.06%, and 0.09%). To study the effect of the addition of magnesium ferrite nanoparticles on the structural, morphological, thermal, and electrochemical properties of zinc oxide. X–ray diffraction (XRD), Rietveld refinement technique, Fourier transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and cyclic voltammetry (CV) were used to investigate the samples. The formation of the spinel cubic structure and hexagonal wurtzite structure of the prepared magnesium ferrite/zinc oxide nanocomposites was confirmed by X-ray diffraction, and no extra phases were detected. The Rietveld-refined X-ray diffraction data revealed spinel cubic and hexagonal wurtzite structures with the P63mc and Fd-3m space group, respectively. The crystallite size decreased from 16 to 15 nm upon the substitution of magnesium ferrite nanoparticles, confirming the formation of nano-crystalline MgFe₂O₄/ZnO nanocomposites. FT-IR spectra were used to verify the absorption bands of MgFe₂O₄, ZnO, and their composites. FE-SEM images revealed the presence of a slight agglomeration of nanoparticles and a non-uniform size distribution. TEM analysis revealed nearly spherical morphologies for all prepared samples, with an average particle size of 19-22 nm. There is variation in the crystallite size as estimated from the instruments, which may be due to strain. The electrochemical behavior was investigated using cyclic voltammetry (CV) with a 0.5 M KCl aqueous solution as the electrolyte. The MgFe₂O₄/ZnO nanocomposite exhibited superior rate performance and cycle stability compared to the other samples when their electrochemical performance was analyzed using cyclic voltammetry (CV). According to the physical results, nanocomposite electrodes exhibited enhanced electrochemical performance, high reversibility, and cycle stability, with specific capacitances ranging from 1.87 F/g (0.01 V) to 7.63 F/g (0.002 V), making them promising candidates for pseudocapacitors.

Keywords

• Cyclic voltameter
• Electron microscopy
• Hetero
• Nanocomposite
• X–ray diffraction
• ZnO