Atomic-level interface engineering enables efficient and durable acidic hydrogen evolution of osmium at large current densities.

ABSTRACT: Osmium (Os), the least expensive member of the platinum-group metals, has emerged as a promising alternative to Pt-based catalysts for the hydrogen evolution reaction (HER). However, Os-based electrocatalysts still suffer from poor stability under acidic conditions, despite recent efforts to mitigate H* over-adsorption for improved intrinsic activity. Here, we design a porous CeO₂ support that enables the atomic dispersion of Os, forming an Os single-atom catalyst (Os_SA-CeO₂). Unlike traditional flat-film supports, the porous CeO₂ architecture prevents Os aggregation and achieves 100% interfacial anchoring of Os atoms. The resulting strong electronic coupling enables tight anchoring of Os and activates the CeO₂ matrix with abundant oxy

SUBMITTER: Lin Q 

PROVIDER: S-EPMC12908458 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature