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

Фізика і хімія твердого тіла

S.I. Yaremiy¹  L.V. Mokhnatska²  A.I. Kachmar²  M.L. Mokhnatskyi²  P.I. Kolkovskyi²  Kh.P. Cherkach²  I.P. Yaremiy² 

[1] Ivano-Frankivsk National Medical University;Vasyl Stefanyk Precarpathian National University;

关键词: sol-gel method;    perovskite structure;    supercapacitor;    impedance;    spectroscopy;    specific capacity;   

DOI  :  10.15330/pcss.21.4.635-639

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown