The synergistic effect of iron cobaltite compare to its single oxides as cathode in supercapacitor
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The synergistic effect of iron cobaltite compare to its single oxides as cathode in supercapacitor Farish Irfal Saaid 1 & Akmal Arsyad 1 & N. S. H. Azman 1 & Amit Kumar 2 & Chih-Chieh Yang 2 & Tseung-Yuen Tseng 2 & Tan Winie 1,3 Received: 9 January 2020 / Accepted: 23 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract 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. Keywords Fe2O3 . Co3O4 . FeCo2O4 . Electrode . Supercapacitor
1 Introduction Supercapacitors, which bridge the gap between conventional dielectric capacitors and batteries are now attracting extensive attention owing to their advantages such as high power density, fast charge-discharge and long cycle life [1]. On the basis of charge storage mechanism, supercapacitors can be divided into two categories, which are electrochemical double layer capacitor (EDLC) and pseudocapacitor. EDLC involves accumulation of ions at the electrode-electrolyte interfaces without any chemical reactions [2]. Carbon materials such as activated
* Tan Winie [email protected] 1
Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
2
Institute of Electronics, National Chiao-Tung University, 1001 Ta Hsueh Rd, Hsinchu 300, Taiwan
3
Institute of Science, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
carbon, graphene and carbon nanotube are used in EDLCs [3–7]. The charge storage mechanism in pseudocapacitor is Faradaic. Faradaic process involves redox reactions and transfer of ions between electrode and electrolyte [8]. For pseudocapacitors, electrode materials are transition metal oxides and conducting polymers such as polypyrrole (PPy) [9, 10],
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