Preparation and Electrochemical Properties of (Ru,Ir,Sn)O2 Electrodes Modified with Graphene Barrier

Abstract

To overcome the short lifetime and low electrochemical activity of dimensionally stable anodes, we developed a novel anode material, the (Ru,Ir,Sn)O2/G electrode, for chlorine evolution reaction. The (Ru,Ir,Sn)O2/G electrode was prepared by introducing a graphene layer into the (Ru,Ir,Sn)O2 coating via thermal decomposition. energy-dispersive spectroscopy results revealed that graphene was successfully retained in the (Ru,Ir,Sn)O2 coating. In contrast to the (Ru,Ir,Sn)O2 electrode, the microstructure of the (Ru,Ir,Sn)O2/G electrode was flat, and there were fewer surface cracks. Linear sweep voltammetry showed values of the chlorine and oxygen evolution overpotentials of the prepared (Ru,Ir,Sn)O2/G electrode of 1.076 V and 1.290 V, respectively. This indicates that the electrocatalytic activity of the (Ru,Ir,Sn)O2/G electrode is better than that of the (Ru,Ir,Sn)O2 electrode. Moreover, electrochemical impedance spectroscopy and an accelerated service lifetime experiment were conducted to study the stability of (Ru,Ir,Sn)O2/G electrodes. The results indicate that the resistance of the (Ru,Ir,Sn)O2/G electrode for the oxygen evolution reaction increased and the accelerated lifetime was 3.35 times longer than that of the (Ru,Ir,Sn)O2 electrode at 2 A/cm2 in 0.5 mol/L H2SO4.