Ruthenium-Iridium Oxide Films Prepared by MOCVD and their Electrocatalytic Activity for Oxygen Evolution

摘要

Ruthenium-iridium oxide films were prepared in an horizontal hot-wall MOCVD apparatus and their electrocatalytic activity was investigated in the oxygen evolution reaction. Metal-acetylacetonates were used as precursors and oxygen as the reactant gas. Appropriate deposition conditions for obtaining bi-metallic oxide films were found to be deposition temperature (T_(dep)), 673 K and total pressure (P_(tot)), 133.32 Pa. X-Ray diffraction (XRD), Rietveld refinement and scanning electron microscopy (SEM) results demonstrated that the MOCVD method is a viable alternative to grow Ru_xIr_(1-x)O_2 films consisted of a single-phase with a very homogeneous distribution of elements. The electrocatalytic activity of the Ru_xIr_(1-x)O_2 films was investigated by cyclic voltammetry and anodic polarization curves in a 0.5 M H_2SO_4 solution at room temperature. The single-phase Ru_(0.4)Ir_(0.6)O_2 films showed to be very promising for the oxygen evolution reaction due to a synergistic effect.