Characterization of MgCo2O4 as an Electrode for High Performance Supercapacitors

• Main Authors: Rajan, Jose, Krishnan, Syam G., Midhun, Harilal, Baiju, Vidyadharan, Izan Izwan, Misnon, Mohd Hasbi, Ab. Rahim, Jamil, Ismail
• Format: Article
• Language: English
• Published: Elsevier 2015
• Subjects: T Technology (General); Q Science (General); TK Electrical engineering. Electronics Nuclear engineering; QD Chemistry; QC Physics
• Online Access: http://umpir.ump.edu.my/id/eprint/8614/1/fist-2015-syam-Characterization%20Of%20MgCO2O4.pdf; http://umpir.ump.edu.my/id/eprint/8614/; http://dx.doi.org/10.1016/j.electacta.2015.02.081

Metal cobaltites have promising electrochemical properties for their application as an energy storage medium. In this paper, usefulness of MgCo2O4 as a supercapacitor electrode is demonstrated and compared its performance with two other cobaltites, MnCo2O4 and CuCo2O4. The materials are synthesized using molten salt method and characterized by X-ray diffraction, scanning electron microscopy, BET surface area, cyclic voltammetry, galvanostatic charge–discharge cycling, and electrochemical impedance spectroscopy techniques. The MgCo2O4 electrodes show superior charge storage properties in 3 M LiOH among a diverse choice of electrolytes. The MgCo2O4 show higher theoretical (∼3122 F/g) and practically achieved capacitance (∼320 F/g), larger coulombic efficiency, and cycling stability than the other two; therefore, it could be developed as a low-cost energy storage medium.