The Structural, Magnetic, and Electrochemical Properties of Composite PAni/Co<sub>0.2</sub>Mn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub>

The current work concerns preparing cobalt manganese ferrite (Co 0.2 Mn 0.8 Fe 2 O 4 ) and decorating it with polyaniline (PAni) for supercapacitor applications. The X-ray diffraction findings (XRD) manifested a broad peak of PAni and a cubic structure of cobalt manganese ferrite with crystal sizes between 21 nm. The pictures were taken with a field emission scanning electron microscope (FE-SEM), which evidenced that the PAni has nanofibers (NF s ) structures, grain size 33 – 55 nm, according to the method of preparation, where the hydrothermal method was used. The magnetic measurements (VSM) that were conducted at room temperature showed that the samples had definite magnetic properties. Additionally, it was noted that the saturation magnetization value of PAni/Co 0.2 Mn 0.8 Fe 2 O 4 nanocomposite and Co 0.2 Mn 0.8 Fe 2 O 4 nanoparticles are maximum saturation magnetization values of (4.7) and (9) emu g −1 respectively. Studying properties of electrochemical which were tested in 1 M of H 2 SO 4 by using the CV cyclic voltammetry analysis, galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS), found the highest capacitance is 596 F/g.