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,Kwangyeol Lee

Nature communications（2025）SCI 1区

Korea University | Sogang University | Korea Institute of Science and Technology | Korea Basic Science Institute (KBSI) | Incheon National University

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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. The development of durable catalysts for efficient hydrogen production from water faces challenges, particularly in the oxygen evolution reaction. Here, the authors report (RuIr)O2 electrocatalysts with enhanced performance, achieved by tuning the growth of Ru/Ir on lattice-modulated templates.

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【要点】：本文通过将铱原子以原子级混合的方式融入钌的二氧化物中，制备出高效且持久的氧析出反应电催化剂，有效避免了钌的溶解和催化剂的降解。

【方法】：研究利用晶格参数调控模板上的钌/铱原子生长行为，将氧析出反应活性中心铱原子与稳定的钌原子结合，实现原子级别的混合，增强电催化性能。

【实验】：(RuIr)O2/C电催化剂在质子交换膜水电解（PEMWE）系统中展现出优异的性能，在2.0V电压下，电流密度达到4.96 A cm−2，质量活性为19.84 A mgRu+Ir−1。实验通过原位光谱分析和计算模拟验证了Ru/Ir双活性位点的协同作用对抑制钌溶解的重要性，以及优化与氧中间体的结合能和稳定钌位点的作用。文中未提及具体使用的数据集名称。

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