Pure and cobalt-substituted zinc-ferrite magnetic ceramics for supercapacitor applications

• Main Authors: Rani, B. Jansi, Ravi, G., Yuvakkumar, R., Ganesh, V., Ravichandran, S., Thambidurai, Mariyappan, Rajalakshmi, A. P., Sakunthala, A.
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Electrical and electronic engineering; Cobalt-substituted Zinc-ferrite; Magnetic
• Online Access: https://hdl.handle.net/10356/139553
• Institution: Nanyang Technological University

Pure and cobalt-substituted zinc ferrites were successfully synthesized employing a simple co-precipitation route. CoxZn0.04−xFe2O4 (x = 0, 0.01, 0.02) physical properties have been investigated employing comprehensive characterization studies. XRD results confirmed the cobalt substitution in zinc-ferrite magnetic ceramics. SEM analysis revealed non-uniform cluster formation with large agglomeration and more number of spherical grain nanoparticles in the range of 30–150 nm. Raman phonon vibration modes [F2g(1) + F2g(2) + A1g] revealed cubic zinc-ferrite phase and cobalt substitution. Product-predominant blue–green emission was observed in PL studies. IR results confirmed ferrite tetrahedral (~ 540–565cm−1) and octahedral sites’ (~ 428 cm−1) metal oxygen vibrations. Electrochemical studies confirmed an appreciable increase in specific capacitance of Co0.02Zn0.02Fe2O4 around 377 F/g at 10 mV/s scan rate. Cobalt substitution in zinc spinel ferrite structure revealed dominant influence on structural, optical, and electrochemical properties of the obtained product.