Atomic-level Ru-Ir mixing in rutile-type (RuIr)O2 for efficient and durable oxygen evolution catalysis

Yeji Park, Ho Yeon Jang, Tae Kyung Lee, Taekyung Kim, Doyeop Kim, Dongjin Kim, Hionsuck Baik, Jinwon Choi, Taehyun Kwon (), Sung Jong Yoo (), Seoin Back () and Kwangyeol Lee ()
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Yeji Park: Korea University
Ho Yeon Jang: Sogang University
Tae Kyung Lee: Korea Institute of Science and Technology
Taekyung Kim: Korea Basic Science Institute (KBSI)
Doyeop Kim: Korea University
Dongjin Kim: Korea University
Hionsuck Baik: Korea Basic Science Institute (KBSI)
Jinwon Choi: Incheon National University
Taehyun Kwon: Incheon National University
Sung Jong Yoo: Korea Institute of Science and Technology
Seoin Back: Sogang University
Kwangyeol Lee: Korea University

Nature Communications, 2025, vol. 16, issue 1, 1-15

Abstract: Abstract The success of proton exchange membrane water electrolysis (PEMWE) depends on active and robust electrocatalysts to facilitate oxygen evolution reaction (OER). Heteroatom-doped-RuOx has emerged as a promising electrocatalysts because heteroatoms suppress lattice oxygen participation in the OER, thereby preventing the destabilization of surface Ru and catalyst degradation. However, identifying suitable heteroatoms and achieving their atomic-scale coupling with Ru atoms are nontrivial tasks. Herein, to steer the reaction pathway away from the involvement of lattice oxygen, we integrate OER-active Ir atoms into the RuO2 matrix, which maximizes the synergy between stable Ru and active Ir centers, by leveraging the changeable growth behavior of Ru/Ir atoms on lattice parameter-modulated templates. In PEMWE, the resulting (RuIr)O2/C electrocatalysts demonstrate notable current density of 4.96 A cm−2 and mass activity of 19.84 A mgRu+Ir−1 at 2.0 V. In situ spectroscopic analysis and computational calculations highlight the importance of the synergistic coexistence of Ru/Ir-dual-OER-active sites for mitigating Ru dissolution via the optimization of the binding energy with oxygen intermediates and stabilization of Ru sites.

Date: 2025
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DOI: 10.1038/s41467-025-55910-1

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