Lu Qian, Liu Jinjie, Zou Xiaohong, Huang Birou, Wu Weixing, Yin Jun, Liu Zhao-Qing, Wang Ying
Department of Chemistry, The Chinese University of Hong Kong, Ma Lin building, Shatin 999077 N.T., Hong Kong SAR, P.R. China.
School of Environmental Science and Technology, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, Nanjing, 210044, P.R. China.
Angew Chem Int Ed Engl. 2025 May 26;64(22):e202503733. doi: 10.1002/anie.202503733. Epub 2025 Mar 31.
Developing highly efficient acidic oxygen evolution reaction (OER) electrocatalysts is crucial for proton exchange membrane water electrolyzer. RuO electrocatalysts, which followed a kinetically favorable lattice oxygen mechanism, perform a preferable intrinsic activity, but poor stability for acidic OER. Recent work often sacrifices the intrinsic activity of RuO to enhance stability. The balance between the activity and stability of RuO-based catalysts is still overlooked in current research. Here, we report a controlled method to introduce metallic Ru onto RuO catalysts to form the Ru─O─Ru interfacial structure for decreasing the Ru oxidation state and promoting deprotonation kinetics. Metallic Ru can serve as the electron donor to lower the oxidation state of *V-RuO in Ru/RuO for stabilizing the structure of *V-RuO -Ru/RuO to favour the acidic OER stability. Moreover, the deprotonation kinetics via the interfacial oxygen site between Ru and Ru is significantly enhanced on Ru/RuO catalysts to improve the acidic OER activity. This work offers a unique perspective to balance the acidic OER activity and stability of RuO.
开发高效的酸性析氧反应（OER）电催化剂对于质子交换膜水电解槽至关重要。遵循动力学有利的晶格氧机制的RuO电催化剂具有较好的本征活性，但在酸性OER中稳定性较差。最近的研究往往牺牲RuO的本征活性来提高稳定性。目前的研究仍然忽视了Ru基催化剂活性和稳定性之间的平衡。在此，我们报道了一种可控方法，将金属Ru引入RuO催化剂中，形成Ru─O─Ru界面结构，以降低Ru的氧化态并促进去质子化动力学。金属Ru可以作为电子供体，降低Ru/RuO中V-RuO的氧化态，稳定V-RuO-Ru/RuO的结构，有利于酸性OER稳定性。此外，Ru/RuO催化剂上通过Ru与Ru之间的界面氧位点的去质子化动力学显著增强，从而提高了酸性OER活性。这项工作为平衡RuO的酸性OER活性和稳定性提供了独特的视角。
