Ultrathin Iridium Nanosheets on Titanium Oxide for High-Efficiency and Durable Proton Exchange Membrane Water Electrolysis.

ABSTRACT: Reducing iridium (Ir) usage is essential for the commercial viability of proton exchange membrane water electrolysis (PEMWE), where the oxygen evolution reaction (OER) is a major performance and cost bottleneck. Conventional Ir nanoparticles (∼5 nm) suffer from low dispersion and limited surface utilization. Here, we report a catalyst architecture comprising ultrathin Ir nanosheets (Ir NS) supported on spherical TiO₂ particles (Ir NS/TiO₂). The ∼100 nm TiO₂ particles effectively disperses 1-3 μm-wide, sub 2 nm-thick Ir nanosheets, ensuring full surface exposure and continuous electron transport, despite the intrinsically low conductivity of TiO₂. The Ir NS/TiO₂ catalyst exhibits enhanced OER activity and durability in both half-cell an

SUBMITTER: Shin D 

PROVIDER: S-EPMC12752681 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature