Facile synthesis of Eu-doped CaTiO3 and their enhanced supercapacitive performance

The first description on the capacitive behavior of Eu-doped CaTiO3 analyzed by adopting cyclic voltammetry (CV), galvanostatic charge/discharge studies (GCD), and electrochemical impedance spectroscopy (EIS) technique is submitted. The present work focused on the synthesis of perovskite type of CaTiO3 and Eu-doped CaTiO3 via simple wet chemical method. The prepared samples were characterized using various spectral and analytical techniques, viz., XRD, FT-IR, SEM, EDX, UV-DRS, and HR-TEM. The electrodes constructed using CaTiO3 and Eu-doped CaTiO3 were tested by CV, GCD, and EIS with an aid of a three-electrode system, composed of the electroactive material as working electrode, Ag/AgCl as reference electrode, and platinum wire as counter electrode in 1 M aqueous KOH as electrolyte. The pronounced specific capacitance (C-sp) of 274 F g(-1) was observed at 1 A g(-1) current density. Furthermore, the synthesized materials showed capacitance retention of 93% even after 2000 charge/discharge cycles. Thus, CaTiO3 and Eu-doped CaTiO3 were found to be significant for energy storage applications. Graphical abstract