Electrochemical Properties of Hybrid Supercapacitors Formed Based on Carbon and ABO3-Type Perovskite Materials

Authors H.M. Kolkovska1, I.P. Yaremiy1 , P.I. Kolkovskyi1,2, S-V.S. Sklepova1, B.I. Rachiy1 , A.G. Belous2, M.O. Halushchak3

1Vasyl Stefanyk Precarpathian National University, 57, Shevchenko St., 76018 Ivano-Frankivsk, Ukraine

2Vernadsky Institute General and Inorganic Chemistry, Kiev, Ukraine

3Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine

Issue Volume 14, Year 2022, Number 1
Dates Received 14 January 2021; revised manuscript received 20 February 2022; published online 28 February 2022
Citation H.M. Kolkovska, I.P. Yaremiy, P.I. Kolkovskyi, et al., J. Nano- Electron. Phys. 14 No 1, 01020 (2022)
DOI https://doi.org/10.21272/jnep.14(1).01020
PACS Number(s) 81.07.Wх, 82.45.Yz, 82.47.Uv
Keywords Electrochemical energy storage devices, Lanthanum manganites, Porous carbon material, Aqueous electrolyte.

In this work, lanthanum (LaMnO3), strontium (SrMnO3) and Sr-doped lanthanum (La0.7Sr0.3MnO3) manganites with the perovskite structure were synthesized by the sol-gel autocombustion method. Moreover, the obtained material structure was investigated by the XRD method. Additionally, the electrochemical properties of nanoporous carbon materials (CMs), lanthanum (LaMnO3) and strontium (SrMnO3) manganites, as well as La0.7Sr0.3MnO3 were investigated by the methods of chronoamperometry and voltammetry, and the application of these materials as electrodes (anode and cathode) of hybrid electrochemical supercapacitors (HECs) was tested. The hybrid electrochemical system of the CM/KOH/La0.7Sr0.3MnO3 type was formed. The employment of this system made it possible to increase the operating voltage range of HEC based on aqueous electrolytes from 0-1 to 0-1.4 V and, consequently, increase the energy characteristics of a unit cell. It was determined that high specific capacitance values were recorded for HECs with an electrode based on La0.7Sr0.3MnO3 and amounted to about 235 F/g at 1 mV/s. At the same time, much lower specific capacitance values were obtained forHECs with electrodes based on LaMnO3 and SrMnO3, which were about 130 F/g and 40 F/g, respectively.

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