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Iridium oxide is the preferred catalyst for water oxidation but it is required to maximize its utilization to deploy Proton Exchange Membrane Water Electrolyzers (PEMWEs) into the large-scale applications panorama. A promising pathway for dispersing this precious catalyst is on an electric conductive and stable support. However, there is a lack of understanding how the support-catalyst interactions affect the stability/activity of the electrocatalyst under anodic conditions. This work discloses a modified, easy-scalable, polyol synthesis protocol to produce a highly active and stable iridium-based catalyst, supported on metal-doped tin oxides. The loading of Ir was reduced 30 wt.% compared to the reference IrO 2 , and dispersed on Sb-SnO 2  (IrOx/ATO), In-SnO 2  (IrOx/ITO) and SnO 2  supports. All synthesized electrocatalysts not only surpassed the OER-mass activity of a commercial catalyst (IrO 2 ) – reference – but also reached higher electrochemical active surface areas and enhanced stability under the OER conditions. The highest performance was achieved with Ir NPs supported on ITO (176 A/gIr  vs.  15.5 A/gIr for the reference catalyst @ 1.51 V  vs.  RHE) and both IrOx/ITO and IrOx/SnO 2  catalysts demonstrated remarkable stability after cycling the electrode and performing long-term chronopotentiometry. ITO is, therefore, an auspicious support to serve Ir-based catalysts as it favors a good bargain between activity and stability, while drastically reducing the amount of noble metal.

Towards stable and highly active IrO2 catalysts supported on doped tin oxides for the oxygen evolution reaction in acidic media

Towards stable and highly active IrO₂ catalysts supported on doped tin oxides for the oxygen evolution reaction in acidic media