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

Abstract

In this work, the Perovskite powders LaFe0.5Cr0.5O3 with space group of P m -3 m was obtained by sol-gel method. The specific surface area of synthesized material is 14 m2/g. Moreover, 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. Thus, the cathode material LaFe0.5Cr0.5O3 demonstrates the specific capacity up to 16 F/g at discharge scan rate 0.5mV/s. Additionally, the maximum of the specific capacity was calculated and it is determined that C is 29.26 F/g, and 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%. Consequently, the Nyquist plots and Mott-Schottky plots for LaFe0.5Cr0.5O3 were obtained, which consist of two parts with different conductivity type, received the values of flat band potential Efb is -1V for n type and Efb is 0.16V for p type of conductivity.