Cluster-Scale MoO_x-IrO₂ Heterointerfaces Steer Dual-Site Coupling and Interfacial Water Dynamics for Fast and Durable Oxygen Evolution.

Authors

Xiaozhong Zheng, Jiangxin Wang, Xinxin Shu, Xiaoyu Zhang, Bingxing Zhang, Guoqiang Zhao, Mingxia Gao, Hongge Pan, Wenping Sun

Published in

Angewandte Chemie (International ed. in English). Oct 24, 2026. Epub Oct 24, 2026.

Abstract

Proton exchange membrane water electrolyzers (PEMWEs) are central to renewable-powered green hydrogen production. As the benchmark electrocatalyst for the oxygen evolution reaction (OER), conventional single-phase IrO₂ is constrained by linear scaling relations among oxygenated intermediates, compounded by severe mass-transport limitations and poorly regulated interfacial water structures. Here, we design a Turing-type MoO_x-IrO₂ heterostructure with strongly coupled cluster-scale interfaces, which enables dual-function Ir-Mo synergy that breaks fundamental kinetic limitations and optimizes interfacial water structures. At the reaction pathway level, Brønsted-acidic MoO_x clusters promote water dissociation to generate reactive Mo─OH* intermediates, triggering radical coupling with adjacent Ir─O* species to form OOH* and thus circumventing the linear scaling relation. At the interfacial microenvironment level, MoO_x reorganizes the rigid hydrogen-bonding networks and increases the population of free H₂O species, effectively alleviating concentration overpotentials under high-current-density operation. When integrated into a practical 25 cm² membrane electrode assembly, this catalyst delivers a PEMWE cell voltage of 1.71 V at 3 A cm^-2 and an ultralow degradation rate of ∼9.5 µV h^-1 over 1000 h, with a total platinum-group-metal loading of merely 0.5 mg cm^-2 across both electrodes. Our dual-modulation strategy establishes a transformative paradigm for developing low-iridium and durable OER electrocatalysts toward practical green hydrogen production.

PMID:
42920344
Bibliographic data and abstract were imported from PubMed on 24 Oct 2026.

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