Stable and oxidative charged Ru enhance the acidic oxygen evolution reaction activity in two-dimensional ruthenium-iridium oxide

Wenxiang Zhu, Xiangcong Song, Fan Liao, Hui Huang, Qi Shao, Kun Feng, Yunjie Zhou, Mengjie Ma, Jie Wu, Hao Yang, Haiwei Yang, Meng Wang, Jie Shi, Jun Zhong, Tao Cheng (), Mingwang Shao (), Yang Liu () and Zhenhui Kang ()
Additional contact information
Wenxiang Zhu: Soochow University
Xiangcong Song: Soochow University
Fan Liao: Soochow University
Hui Huang: Soochow University
Qi Shao: Soochow University
Kun Feng: Soochow University
Yunjie Zhou: Soochow University
Mengjie Ma: Soochow University
Jie Wu: Soochow University
Hao Yang: Soochow University
Haiwei Yang: Soochow University
Meng Wang: Soochow University
Jie Shi: Soochow University
Jun Zhong: Soochow University
Tao Cheng: Soochow University
Mingwang Shao: Soochow University
Yang Liu: Soochow University
Zhenhui Kang: Soochow University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The oxygen evolution reactions in acid play an important role in multiple energy storage devices. The practical promising Ru-Ir based catalysts need both the stable high oxidation state of the Ru centers and the high stability of these Ru species. Here, we report stable and oxidative charged Ru in two-dimensional ruthenium-iridium oxide enhances the activity. The Ru0.5Ir0.5O2 catalyst shows high activity in acid with a low overpotential of 151 mV at 10 mA cm−2, a high turnover frequency of 6.84 s−1 at 1.44 V versus reversible hydrogen electrode and good stability (618.3 h operation). Ru0.5Ir0.5O2 catalysts can form more Ru active sites with high oxidation states at lower applied voltages after Ir incorporation, which is confirmed by the pulse voltage induced current method. Also, The X-ray absorption spectroscopy data shows that the Ru-O-Ir local structure in two-dimensional Ru0.5Ir0.5O2 solid solution improved the stability of these Ru centers.

Date: 2023
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DOI: 10.1038/s41467-023-41036-9

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