LaFeO₃ Modified RuO₂ for Enhancing Electrochemical Performances

Abstract

LaFeO3 nanoparticles-modified RuO2 and RuO2 samples were fabricated by a thermal decomposition and was characterized by powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and cyclic voltammetry tests. XRD results reveal that the RuO2 and RuO2-LaFeO3 samples are mainly a rutile structure. Compared with the RuO2 sample, the RuO2-LaFeO3 sample has smaller crystalline grain size. Cyclic voltammetry analysis shows the voltammetric behaviour and the characteristic potentials of the RuO2 and the RuO2-LaFeO3 samples are similar in 1.0 M KOH solution. Voltammetric charge analysis reveals that the RuO2-LaFeO3 sample has higher concentrated of surface active species and larger exposed surface area than the RuO2 sample. Capacitive measurement results show the Double-layer capacitance (Cdl) and the electrochemical surface area (ECSA) values of the RuO2-LaFeO3 sample are approximately 2 times larger than those of the RuO2 sample, indicating that the electrochemical active surface area increase when integrating of RuO2 with LaFeO3 nanoparticles.