Promising Cathode Material for Supercapacitors LaFe0.5Cr0.5O3 Perovskite Nanoparticles

  • I.P. Yaremiy Vasyl Stefanyk Precarpathian National University
  • M.L. Mokhnatskyi Vasyl Stefanyk Precarpathian National University
  • P.I. Kolkovskyi Vasyl Stefanyk Precarpathian National University
  • L.V. Mokhnatska Vasyl Stefanyk Precarpathian National University
  • S.I. Yaremiy Ivano-Frankivsk National Medical University
  • A.I. Kachmar Vasyl Stefanyk Precarpathian National University
  • Kh.P. Cherkach Vasyl Stefanyk Precarpathian National University
Keywords: sol-gel method, perovskite structure, supercapacitor, impedance, spectroscopy, specific capacity

Abstract

In this work, the Perovskite powders LaFe0.5Cr0.5O3 with a space group of P m - 3 m was obtained by the sol-gel method. The nanoscale powders of LaFe0.5Cr0.5O3 have been tested as a cathode material for electrochemical supercapacitors. The CVA and charge-discharge curves were obtained at 0.5 mV/s to 16 mV/s and 0.5 mA/s to 16 mA/s scan rates accordingly. It is established that the cathode material LaFe0.5Cr0.5O3 demonstrates the specific capacity up to 16 F/g at a discharge scan rate 0.5 mV/s. Additionally, the maximum of the specific capacity was calculated and it is determined that C is 29.26 F/g, and the specific capacity of double electric layer CDEL is 3.44 F/g. It was determined that the contribution of the redox reactions in specific capacity is 88 %. The Nyquist plots and Mott-Schottky plots for LaFe0.5Cr0.5O3 were obtained. They consist of two parts that correspond to a different type of conductivity. Thus, it is established that LaFe0.5Cr0.5O3 shows different types of conductivity depending on the applied potential. The received values of flat band potential are -1.00 V and 0.16 V for n-type and p-type of conductivity accordingly.

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Published
2020-12-30
How to Cite
[1]
YaremiyI., MokhnatskyiM., KolkovskyiP., MokhnatskaL., YaremiyS., KachmarA. and CherkachK. 2020. Promising Cathode Material for Supercapacitors LaFe0.5Cr0.5O3 Perovskite Nanoparticles. Physics and Chemistry of Solid State. 21, 4 (Dec. 2020), 635-639. DOI:https://doi.org/10.15330/pcss.21.4.635-639.
Section
Scientific articles

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