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

Hui Su (), Chenyu Yang, Meihuan Liu, Xu Zhang, Wanlin Zhou, Yuhao Zhang, Kun Zheng, Shixun Lian () and Qinghua Liu ()
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Hui Su: College of Chemistry and Chemical Engineering, Hunan Normal University
Chenyu Yang: University of Science and Technology of China
Meihuan Liu: Central South University
Xu Zhang: Faculty of Materials and Manufacturing, Beijing University of Technology
Wanlin Zhou: University of Science and Technology of China
Yuhao Zhang: University of Science and Technology of China
Kun Zheng: Faculty of Materials and Manufacturing, Beijing University of Technology
Shixun Lian: College of Chemistry and Chemical Engineering, Hunan Normal University
Qinghua Liu: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: 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 oxygen atoms in the inner MnO2 bulk to optimize the structural integrity of the catalyst. Importantly, the resultant PEMWE device fabricated using TS-Ir/MnO2 delivers a current density of 500 mA cm−2 and operates stably for 200 h.

Date: 2024
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DOI: 10.1038/s41467-023-44483-6

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