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https://doi.org/10.1007/s11664-020-08296-3  2020 The Minerals, Metals & Materials Society

Electrochemical Behavior of an Advanced FeCo2O4 Electrode for Supercapacitor Applications M. PURATCHI MANI,1,5 K. PONNARASI,2 A. RAJENDRAN,3 V. VENKATACHALAM,4 K. THAMIZHARASAN,4 and M. JOTHIBAS5,6 1.—Department of Physics, As-Salam College of Engineering and Technology, Thirumangalakudi, Aduthurai 612 012, India. 2.—Department of Physics, Pachaiyappa’s College, Chennai 600 030, India. 3.—Department of Chemistry, Sir Theagaraya College, Chennai 600 021, India. 4.—Department of Physics, Sir Theagaraya College, Chennai 600 021, India. 5.—Department of Physics, T.B.M.L College, Porayar, Nagapattinam 609 307, India. 6.—e-mail: [email protected]

In this work, we report the synthesis of FeCo2O4 nanostructure electro-active material through a double-hydroxide medium via a facile hydrothermal method. The obtained product was subjected to structural and morphological studies. Morphological images of FeCo2O4 material revealed rod-like structures. Electrochemical properties of the modified electrode were evaluated by cyclic voltammetry, charge–discharge and electrochemical impedance spectroscopy techniques. The modified FeCo2O4 electrode delivered the highest specific capacitance of 393.5 F g1 at a current density of 1 A g1 in 2 M KOH aqueous electrolyte with battery-type faradaic behavior and excellent capacitive properties. Furthermore, the long cycling stability of the electrode was tested up to 1000 cycles under a constant current density of 2 A g1. The novel synthetic route of FeCo2O4 preparation is a convenient potential means of obtaining secondary energy material for supercapacitor applications. Key words: Spinel oxide, hydrothermal method, supercapacitors, electrochemical properties

INTRODUCTION In recent years, supercapacitors (SCs), as one of the most promising energy storage devices, have attracted increasing interest owing to their highpower density, safety properties and excellent cycling stability.1–3 For the development of highperformance supercapacitors, greater attention has been paid to the design and synthesis of novel electrode materials. Among all available electrode materials, transition metal oxides (TMOs) such as Co3O4 and NiO have been widely investigated because of their excellent electrochemical behaviors. However, these oxides mainly suffer from high cost, toxicity or poor conductivity.4–8 Hence, it is important to explore new low-cost and eco-friendly

(Received February 21, 2020; accepted June 24, 2020)

electrode materials with excellent electrochemical properties. Recently, researchers have considered AB2O4-based spinel oxide nanostructures as potential electrode materials for supercapacitors.9–12 For example, according to our previous work, binary metal oxides such as MnCo2O4 are well-known battery-type electrode materials with a spinel structure possessing superior capacitive performance due to their stronger electrochemical activity and richer redox reactions compared with the singlecompone