Ultrafine beta-FeOOH and Fe3O4 obtained by precipitation method: comparative study of electrical and electrochemical properties

L.V. Mokhnatska; V.O.  Kotsyubynsky; V.M. Boichuk; M.L. Mokhnatskyi; Kh.V. Bandura; A.I. Kachmar; M.A. Hodlevska; V.V. Bachuk

doi:10.15330/pcss.21.4.680-688

Authors

L.V. Mokhnatska Vasyl Stefanyk Precarpathian National University
V.O. Kotsyubynsky Vasyl Stefanyk Precarpathian National University
V.M. Boichuk Vasyl Stefanyk Precarpathian National University
M.L. Mokhnatskyi Vasyl Stefanyk Precarpathian National University
Kh.V. Bandura Ivano-Frankivsk National Medical University
A.I. Kachmar Vasyl Stefanyk Precarpathian National University
M.A. Hodlevska Vasyl Stefanyk Precarpathian National University
V.V. Bachuk Ivano-Frankivsk National Technical University of Oil and Gas

DOI:

https://doi.org/10.15330/pcss.21.4.680-688

Keywords:

iron oxides, super-linear dependence, electrode material, supercapacitor, impedance, spectroscopy, specific capacity, electrical conductivity, cyclic voltammetry

Abstract

In this work, ultrafine powders of b-FeOOH and Fe₃O₄ have been obtained by the precipitation method. The values of the specific surface area for materials b-FeOOH and Fe₃O₄ are 101 and 135 m²/h. Frequency dependences of specific electrical conductivity have been obtained in the temperature range of 20-150 ^oC. It has been found that the materials show a superlinear dependence (SPL). In addition, the crossover energies from dc to JPL and from JPL to SPL have been calculated: Edc = 0.55eV, E_p1 = 0.51eB, E_p2 = 0.16eB and E_dc = 0.22 eV, E_p1 = 0.21eB, E_p2 = 0.1 eB. Potentiodynamic studies have been performed at a scan rate from 1 mV/s to 50 mV/s. The b-FeOOH electrode material showed a specific capacitance value of 80 F/g at a scan rate of 1 mV/s, while the specific capacitance of the Fe₃O₄ material reached 32 F/g. Galvanostatic measurements have been done for discharge currents of 0.05 A/g, 0.1 A/g - 0.25 A/g. b-FeOOH sample is characterized by the maximum specific energy value of 8 W h/kg at the value of specific power equal to 20 W/kg, and Fe₃O₄material is characterized by the maximum specific energy of about 3.5 W h/kg.

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