Presentation Information
[1E06]Development of PtIr nanowires for oxygen evolution reaction
*Bohao Du1, Masaru Kato2, Ichizo Yagi2 (1. Graduate School of Environmental Science, Hokkaido University, 2. Faculty of Environmental Earth Science, Hokkaido University)
This study focuses on the development of PtIr nanowire electrocatalysts for enhanced oxygen evolution reaction (OER) performance in proton exchange membrane water electrolyzers (PEMWEs). While IrO2 remains one of the few stable catalysts in strong acidic media, its high cost and limited supply necessitate strategies to improve Ir utilization and catalyst durability. To this end, nanostructuring and alloying are proposed. PtIr nanowires were synthesized at 433 K,493 K,and 553 K using Pt(acac)2 and IrCl3 as precursors.
Their morphology and composition were analyzed via TEM and ICP-OES. At 553 K, nanowires with a Pt:Ir atomic ratio of 1:1 were obtained, where Ir atoms were predominantly located on the surface, enhancing active site exposure. In situ XAFS measurements demonstrated reversible redox behavior of Pt and Ir under varying potentials, confirming electrochemical stability. Electrochemical tests revealed that the PtIr nanowires synthesized at 553 K showed the highest mass activity at 1.6 V vs. RHE in 0.1 M HClO4, outperforming commercial IrOx.These findings suggest a promising strategy for designing stable and resource-efficient Ir metal catalysts.
Their morphology and composition were analyzed via TEM and ICP-OES. At 553 K, nanowires with a Pt:Ir atomic ratio of 1:1 were obtained, where Ir atoms were predominantly located on the surface, enhancing active site exposure. In situ XAFS measurements demonstrated reversible redox behavior of Pt and Ir under varying potentials, confirming electrochemical stability. Electrochemical tests revealed that the PtIr nanowires synthesized at 553 K showed the highest mass activity at 1.6 V vs. RHE in 0.1 M HClO4, outperforming commercial IrOx.These findings suggest a promising strategy for designing stable and resource-efficient Ir metal catalysts.