Abstract
Developing highly conductive and durable support materials for Ir-based electrocatalysts in acidic oxygen evolution reactions (OER) is one of the challenges to overcoming corrosion conduction during the anodic process. In this study, we develop an oxide-type support material(Bi3TaO7) for IrOx electrocatalyst in acidic OER to minimize the amount of iridium loading level. Through a combination of various physical and chemical analyses(XRD, TEM, XRF, EIS, XPS, XAS, etc.), it is demonstrated that the IrOx/Bi3TaO7 electrocatalyst showed remarkable OER performances and enhanced mass activity compared to unsupported IrOx electrocatalysts. Bi on the surface of Bi3TaO7 suppresses the change in oxidation state of Ir element, maintains activity of IrOx electrocatalyst during electrochemical reaction and induces chemical and physical stability of the IrOx/Bi3TaO7 electrocatalyst. These findings can provide further insight into a new category of anode support materials for proton exchange membrane water electrolyzers.
Published Version
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