Synthesis of Ytterbium Tungstate with Excellent Pseudocapacitive Behavior and a High Cycling Stability Material for Supercapacitors

Abstract

Nanoparticles of ytterbium tungstate prepared through the direct addition of an Yb3+ solution to a tungstate solution, were computed through Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS). Further the supercapacitive characteristics of the nanoparticles, as a potential material for constructing electrodes, were evaluated through cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). Electrodes made of the Yb₂(WO₄)₃ had a specific capacitance (SC) value of 336 F g^-1 in a 2.0 M H₂SO₄ solution at a potential scan rate of 2 mV s^-1; and 298 F g^-1 at a current density of 1 A g^-1 based on GCD tests. The electrodes also revealed to have a 95.8% cycling durability after 4000 potential cycles.