Tensile straining of iridium sites in manganese oxides for proton-exchange membrane water electrolysers.

ABSTRACT: Although the acidic oxygen evolution reaction (OER) plays a crucial role in proton-exchange membrane water electrolysis (PEMWE) devices, challenges remain owing to the lack of efficient and acid-stable electrocatalysts. Herein, we present a low-iridium electrocatalyst in which tensile-strained iridium atoms are localized at manganese-oxide surface cation sites (TS-Ir/MnO₂) for high and sustainable OER activity. In situ synchrotron characterizations reveal that the TS-Ir/MnO₂ can trigger a continuous localized lattice oxygen-mediated (L-LOM) mechanism. In particular, the L-LOM process could substantially boost the adsorption and transformation of H₂O molecules over the oxygen vacancies around the tensile-strained Ir sites and prevent further loss of lattice

SUBMITTER: Su H 

PROVIDER: S-EPMC10762142 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature