Locking the lattice oxygen in RuO2 to stabilize highly active Ru sites in acidic water oxidation

Xinyu Ping, Yongduo Liu, Lixia Zheng, Yang Song, Lin Guo, Siguo Chen () and Zidong Wei
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Xinyu Ping: Chongqing University
Yongduo Liu: Chongqing University
Lixia Zheng: Chongqing University
Yang Song: Chongqing University
Lin Guo: SINOPEC Research Institute of Petroleum Processing Co., Ltd.
Siguo Chen: Chongqing University
Zidong Wei: Chongqing University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Ruthenium dioxide is presently the most active catalyst for the oxygen evolution reaction (OER) in acidic media but suffers from severe Ru dissolution resulting from the high covalency of Ru-O bonds triggering lattice oxygen oxidation. Here, we report an interstitial silicon-doping strategy to stabilize the highly active Ru sites of RuO2 while suppressing lattice oxygen oxidation. The representative Si-RuO2−0.1 catalyst exhibits high activity and stability in acid with a negligible degradation rate of ~52 μV h−1 in an 800 h test and an overpotential of 226 mV at 10 mA cm−2. Differential electrochemical mass spectrometry (DEMS) results demonstrate that the lattice oxygen oxidation pathway of the Si-RuO2−0.1 was suppressed by ∼95% compared to that of commercial RuO2, which is highly responsible for the extraordinary stability. This work supplied a unique mentality to guide future developments on Ru-based oxide catalysts’ stability in an acidic environment.

Date: 2024
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DOI: 10.1038/s41467-024-46815-6

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