Surface sulfonic-group bonded oxygen evolution catalyst for proton exchange membrane water electrolysis.

ABSTRACT: Proton transport plays a crucial role in acidic oxygen evolution reaction process. Iridium oxide (IrO_x) exhibits good stability, yet its catalytic activity remains insufficient at high current density. Trace sulfonates introduced into electrocatalysts can enhance the proton transfer process; however, their significant leaching compromises catalyst stability. Herein, we report a sulfonic groups ( - SO₃H) grafted catalyst, Ir/IrO_x ~ SO₃H, featuring covalent bonding between sulfonic groups and iridium oxide. The anchored sulfonic groups facilitate enhancing the proton transfer process and promote the formation of *OOH intermediates, thereby accelerating the oxygen evolution reaction kinetics. A proton exchange membrane water electrolysis assembled w

SUBMITTER: Li J 

PROVIDER: S-EPMC12606313 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature