Improved electrochemical performances of cobalt molybdate electrode using Gd3+ dopant and redox additive electrolyte: a simple synthesis platform

Abstract

In the present work, we outlined a simple strategy to prepare a dynamic Gd/CoMoO₄ electrode material by robust microwave combustion method and the dopant effects of Gd on host CoMoO₄ electrodes for efficient supercapacitors have been investigated by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopic measurements. Powder X-ray diffraction (XRD) pattern, Fourier-transform infrared (FTIR), and Raman spectra confirmed the formation of hybrid nanocomposites. The analyzed morphological phenomenon of the samples confirms the pseudo-ellipsoid-shaped nanostructure. Electrochemical tests have been applied in aqueous KOH and redox additive electrolyte in three-electrode configurations for 5%-Gd/CoMoO₄ hybrid nanocomposite demonstrating a higher specific capacitance of 2069.36 F g⁻¹ at 5 A g⁻¹ in redox additive electrolyte, which is almost 4.23-folded times higher than the specific capacitance of same sample obtained in aqueous KOH electrolyte. The results reported herein are significant as they offer a perception into the factors prompting highly energetic and fast reactive species in the hybrid nanocomposites, as a potential cathode material for energy-storing applications. The electrochemical result offers the utilization of redox additive is the best and cost-effective stratagem for obtaining effective and eco-friendly hybrid supercapacitor devices.