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

Title：

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

Authors：

Wenxiang Zhu^1#, Xiangcong Song^1#, Fan Liao¹, Hui Huang¹, Qi Shao², Kun Feng¹, Yunjie Zhou¹, Mengjie Ma¹, Jie Wu¹, Hao Yang¹, Haiwei Yang¹, Meng Wang¹, Jie Shi¹, Jun Zhong¹, Tao Cheng^1, *, Mingwang Shao¹*, Yang Liu¹ * and Zhenhui Kang^{1, 3}*

Institutions：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren’ai Road, Suzhou 215123 Jiangsu, China.

²College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China.

³Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa, 999078 Macau, SAR, China.

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 Ru_0.5Ir_0.5O₂ 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). Ru_0.5Ir_0.5O₂ 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 Ru_0.5Ir_0.5O₂ solid solution improved the stability of these Ru centers.

IF：

17.694

Link：

https://doi.org/10.1038/s41467-023-41036-9