Customized reaction route for ruthenium oxide towards stabilized water oxidation in high-performance PEM electrolyzers

Zhaoping Shi, Ji Li, Yibo Wang, Shiwei Liu, Jianbing Zhu, Jiahao Yang, Xian Wang, Jing Ni, Zheng Jiang, Lijuan Zhang, Ying Wang (), Changpeng Liu, Wei Xing () and Junjie Ge ()
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Zhaoping Shi: Chinese Academy of Sciences
Ji Li: Chinese Academy of Sciences
Yibo Wang: Chinese Academy of Sciences
Shiwei Liu: Chinese Academy of Sciences
Jianbing Zhu: Chinese Academy of Sciences
Jiahao Yang: Chinese Academy of Sciences
Xian Wang: Chinese Academy of Sciences
Jing Ni: Chinese Academy of Sciences
Zheng Jiang: Chinese Academy of Sciences
Lijuan Zhang: Chinese Academy of Sciences
Ying Wang: Chinese Academy of Sciences
Changpeng Liu: Chinese Academy of Sciences
Wei Xing: Chinese Academy of Sciences
Junjie Ge: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract The poor stability of Ru-based acidic oxygen evolution (OER) electrocatalysts has greatly hampered their application in polymer electrolyte membrane electrolyzers (PEMWEs). Traditional understanding of performance degradation centered on influence of bias fails in describing the stability trend, calling for deep dive into the essential origin of inactivation. Here we uncover the decisive role of reaction route (including catalytic mechanism and intermediates binding strength) on operational stability of Ru-based catalysts. Using MRuOx (M = Ce4+, Sn4+, Ru4+, Cr4+) solid solution as structure model, we find the reaction route, thereby stability, can be customized by controlling the Ru charge. The screened SnRuOx thus exhibits orders of magnitude lifespan extension. A scalable PEMWE single cell using SnRuOx anode conveys an ever-smallest degradation rate of 53 μV h−1 during a 1300 h operation at 1 A cm−2.

Date: 2023
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DOI: 10.1038/s41467-023-36380-9

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