Synthesis of ZnFe 2 O 4 nanoparticles with high specific surface area for high-performance supercapacitor
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Synthesis of ZnFe2O4 nanoparticles with high specific surface area for high-performance supercapacitor Reza Roshani1 and Azadeh Tadjarodi1,* 1
Research Laboratory of Inorganic Materials Synthesis, Department of Chemistry, Iran University of Science and Technology, 16846-13114 Tehran, Iran
Received: 25 July 2020
ABSTRACT
Accepted: 3 November 2020
The specific surface area is an important parameter influencing the storage capability of materials due to its direct effect on the reaction sites availability. In this study, ZnFe2O4 nanoparticles with a high specific surface area, 78.9 m2 g-1, were prepared by a weak ultrasonic irradiation technique. Fe(NO3)39H2O, Zn(NO3)26H2O and glucose were used as reagents and the prepared precursor was calcined in the air at 400 °C for 3 h. The product was characterized by thermogravimetric analysis, Fourier transform infrared, Raman spectra, X-ray diffraction, Brunauer–Emmett–Teller, Scanning electron microscopy as well as Transmission electron microscopy. The charge storage ability, cycling stability, and ion transport of the produced ZnFe2O4 nanoparticles were examined by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy tests in 1, 3 and 6 M KOH solutions. The highest specific capacitance of the ZnFe2O4 nanoparticles was obtained 712 F g-1 at the scan rate of 2 mV s-1 in 6 M KOH electrolyte, and the capacity retention for ZnFe2O4 nanoparticles was still maintained after 2000 cycles at 92.4, 94.2 and 96.6% in 1, 3 and 6 M KOH electrolytes, respectively.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Increasing demand for nanomaterials with large specific surface area for a variety of uses (e.g., supercapacitors) has recently attracted the attention of researchers in this field [1]. Supercapacitors are tools with high power density, long cycle life and high charging and discharging rates [2–11]. There are growing demands for the next-generation flexible and lightweight energy storage devices with high power and energy densities due to their unique
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https://doi.org/10.1007/s10854-020-04830-5
characteristics and potential applications in various portable electronic tools such as memory backup systems [3] smart sensors, flexible touch screen, electronic newspaper [5, 6], mobiles [5, 6, 9] and hybrid electric vehicles [3, 8, 9]. Supercapacitors can be classified as electrical double-layer capacitors (EDLCs) according to the energy storage mechanism, which store energy through the formation of electrical double layer at the electrode–electrolyte interface (e.g., carbon-based materials) and pseudocapacitor, which store energy by electron transfer Faradaic
J Mater Sci: Mater Electron
redox reaction [7, 8, 12–18]. Transition metal oxides having binary and ternary compositions like RuO2, NiO, CuO, CoO, Co3O4, MnO2, Mn3O4 [16, 19], NiMoO4, Fe3O4, Fe2O3, MnFe2O4, ZnFe2O4, CuFe2O4, CoFe2O4 NiCo2O4, and CuCo2O4 have been widely studied as the pse
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