Electrochemical Pseudo-Capacitance and Electric Reduction Treatment of Zn_xFe_3-xO₄ Spinel Ferrite Electrodes

Abstract

Zn_xFe_3-xO₄ spinel ferrite nanoparticles were prepared by the coprecipitation technique. This research studied the effects of the x value and electric reduction on the electrochemical properties of Zn_xFe_3-xO₄ spinel ferrite electrodes. Results showed the pseudo-capacitances of Zn_xFe_3-xO₄ electrodes decreased with an increase in the x value and these capacitances increased after electric reduction at the −0.7 V vs. Ag/AgCl reference electrode. In addition, the pseudo-capacitance after electric reduction decreased with repetition of the charge-discharge cycles. However, pseudo-capacitance increased again due to the re-treated electric reduction.