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

I.P. Yaremiy; M.L. Mokhnatskyi; P.I. Kolkovskyi; L.V. Mokhnatska; S.I. Yaremiy; A.I. Kachmar; Kh.P. Cherkach

doi:10.15330/pcss.21.4.635-639

Authors

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

DOI:

https://doi.org/10.15330/pcss.21.4.635-639

Keywords:

sol-gel method, perovskite structure, supercapacitor, impedance, spectroscopy, specific capacity

Abstract

In this work, the Perovskite powders LaFe_0.5Cr_0.5O₃ with a space group of P m - 3 m was obtained by the sol-gel method. The nanoscale powders of LaFe_0.5Cr_0.5O₃have 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 LaFe_0.5Cr_0.5O₃ 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 C_DEL 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 LaFe_0.5Cr_0.5O₃ were obtained. They consist of two parts that correspond to a different type of conductivity. Thus, it is established that LaFe_0.5Cr_0.5O₃ 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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