Single-faceted IrO₂ monolayer enabling high-performing proton exchange membrane water electrolysis beyond 10,000 h stability at 1.5 A cm^-2.

ABSTRACT: Both commercial and laboratory-synthesized IrO₂ catalysts typically possess rutile-type structures with multiple facets. Theoretical results predict the (101) facet is the most energetically favorable for oxygen evolution reaction owing to its lowest energy barrier. Achieving monolayer thickness while exposing this desired facet is a significant opportunity for IrO₂. Herein, we develop an ammonia-induced facet engineering for the synthesis of single-faceted IrO₂(101) monolayer. It achieves 230 mV overpotential at 10 mA cm_geo^-2 in a three-electrode system and 1.70 V at 2 A cm_geo^-2 in a proton exchange membrane (PEM) electrolyzer. Though facet engineering primarily contributes to modulating the intrinsic activity ra

SUBMITTER: Yang D 

PROVIDER: S-EPMC12328741 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature