The synergistic effect of iron cobaltite compare to its single oxides as cathode in supercapacitor
| Autor: | Chih Chieh Yang, N. S.H. Azman, Amit Kumar, Akmal Arsyad, Tseung-Yuen Tseng, Farish Irfal Saaid, Tan Winie |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Supercapacitor Materials science Scanning electron microscope Iron oxide 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Cobaltite Dielectric spectroscopy chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials 0103 physical sciences Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering Fourier transform infrared spectroscopy Cyclic voltammetry 0210 nano-technology Cobalt oxide |
| Zdroj: | Journal of Electroceramics. 44:183-194 |
| ISSN: | 1573-8663 1385-3449 |
| Popis: | 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 (FeCo2O4) and its single metal oxides i.e. iron oxide (Fe2O3) and cobalt oxide (Co3O4) 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-Fe2O3. FESEM images show that FeCo2O4 and its single metal oxides exhibit different morphology even though they were synthesized via similar method. The electrochemical properties of the α-Fe2O3, Co3O4 and FeCo2O4 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 FeCo2O4 electrode has the highest specific capacitance (Csp), followed by Co3O4 and α-Fe2O3. An asymmetric FeCo2O4/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. |
| Databáze: | OpenAIRE |
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