Crystal-Phase Engineering of Nanowires and Platelets of K _<i>x</i> IrO₂ for Efficient Water Oxidation.

ABSTRACT: IrO₂ is one of the most widely investigated electrocatalysts for oxygen evolution reaction in an acidic environment. Increasing the mass activity is an effective way of decreasing the loading of Ir, to ultimately reduce costs. Here, we demonstrate the crystal-phase engineering of two different potassium iridate polymorphs obtained by designing a selective solid-state synthesis of either one-dimensional K_0.25IrO₂ nanowires with a hollandite crystal structure or two-dimensional KIrO₂ hexagonal platelets. Both structures present increased specific and mass electrocatalytic activities for the water oxidation reaction in acidic media compared to commercial rutile IrO₂ of up to 40%, with the 1D nanowires outperforming the 2D platelets. XANES

SUBMITTER: Quintin-Baxendale R 

PROVIDER: S-EPMC12616440 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature