The synergistic effect of iron cobaltite compare to its single oxides as cathode in supercapacitor

• Published in: Journal of electroceramics 2020-06, Vol.44 (3-4), p.183-194
• Main Authors: Saaid, Farish Irfal, Arsyad, Akmal, Azman, N. S. H., Kumar, Amit, Yang, Chih-Chieh, Tseng, Tseung-Yuen, Winie, Tan
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cobalt oxides; Composites; Crystallography and Scattering Methods; Discharge; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Flux density; Fourier transforms; Glass; Infrared spectroscopy; Iron oxides; Materials Science; Maximum power density; Metal oxides; Morphology; Natural Materials; Optical and Electronic Materials; Spectrum analysis; Supercapacitors; Synergistic effect; Synthesis; Transition metal oxides; X-ray diffraction
• ISSN: 1385-3449; 1573-8663
• DOI: 10.1007/s10832-020-00209-4

Mixed transition metal oxides have attracted great attention in supercapacitors applications due to their better electrochemical performance than their single oxides. In this work, iron cobaltite (FeCo 2 O 4 ) and its single metal oxides i.e. iron oxide (Fe 2 O 3 ) and cobalt oxide (Co 3 O 4 ) were synthesized by a simple hydrothermal process. The structural, spectroscopic and morphological properties were studied using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and field-emission scanning electron microscope (FESEM). XRD and FTIR results show the composition of the products. The obtained iron oxide was α -Fe 2 O 3 . FESEM images show that FeCo 2 O 4 and its single metal oxides exhibit different morphology even though they were synthesized via similar method. The electrochemical properties of the α -Fe 2 O 3 , Co 3 O 4 and FeCo 2 O 4 electrodes were examined by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) in a 6 M KOH electrolyte solution. At comparable current density, the FeCo 2 O 4 electrode has the highest specific capacitance ( C sp ), followed by Co 3 O 4 and α -Fe 2 O 3 . An asymmetric FeCo 2 O 4 /KOH/GO supercapacitor was fabricated. The supercapacitor exhibits maximum energy density of 14.5 Wh kg −1 and maximum power density of 2177 W kg −1 . It demonstrates 60% rate capability after 1000 continuous charge-discharge cycles at 1 A g −1 .