稳定且带氧化电荷的钌增强了二维钌铱氧化物中的析氧反应活性。
Stable and oxidative charged Ru enhance the acidic oxygen evolution reaction activity in two-dimensional ruthenium-iridium oxide.
作者信息
Zhu Wenxiang, Song Xiangcong, Liao Fan, Huang Hui, Shao Qi, Feng Kun, Zhou Yunjie, Ma Mengjie, Wu Jie, Yang Hao, Yang Haiwei, Wang Meng, Shi Jie, Zhong Jun, Cheng Tao, Shao Mingwang, Liu Yang, Kang Zhenhui
机构信息
Institute 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.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.
出版信息
Nat Commun. 2023 Sep 4;14(1):5365. doi: 10.1038/s41467-023-41036-9.
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 RuIrO catalyst shows high activity in acid with a low overpotential of 151 mV at 10 mA cm, a high turnover frequency of 6.84 s at 1.44 V versus reversible hydrogen electrode and good stability (618.3 h operation). RuIrO 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 RuIrO solid solution improved the stability of these Ru centers.
酸性条件下的析氧反应在多种储能装置中起着重要作用。实际应用中具有潜力的钌 - 铱基催化剂既需要钌中心稳定的高氧化态，又需要这些钌物种具有高稳定性。在此，我们报道二维钌铱氧化物中稳定且带正电荷的钌增强了活性。RuIrO催化剂在酸性条件下表现出高活性，在10 mA cm时过电位低至151 mV，相对于可逆氢电极在1.44 V时周转频率高达6.84 s且具有良好的稳定性（运行618.3 h）。通过脉冲电压诱导电流法证实，RuIrO催化剂在引入铱后，能在较低施加电压下形成更多具有高氧化态的钌活性位点。此外，X射线吸收光谱数据表明二维RuIrO固溶体中的Ru - O - Ir局部结构提高了这些钌中心的稳定性。
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