Zheng Wen-Xing, Cheng Xuan-Xuan, Chen Ping-Ping, Wang Lin-Lin, Duan Ying, Feng Guo-Jin, Wang Xiao-Ran, Li Jing-Jing, Zhang Chao, Yu Zi-You, Lu Tong-Bu
MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin, China.
Nat Commun. 2025 Jan 2;16(1):337. doi: 10.1038/s41467-024-55747-0.
Ruthenium dioxide has attracted extensive attention as a promising catalyst for oxygen evolution reaction in acid. However, the over-oxidation of RuO into soluble HRuO species results in a poor durability, which hinders the practical application of RuO in proton exchange membrane water electrolysis. Here, we report a confinement strategy by enriching a high local concentration of in-situ formed HRuO species, which can effectively suppress the RuO degradation by shifting the redox equilibrium away from the RuO over-oxidation, greatly boosting its durability during acidic oxygen evolution. Therefore, the confined RuO catalyst can continuously operate at 10 mA cm for over 400 h with negligible attenuation, and has a 14.8 times higher stability number than the unconfined RuO catalyst. An electrolyzer cell using the confined RuO catalyst as anode displays a notable durability of 300 h at 500 mA cm and at 60 °C. This work demonstrates a promising design strategy for durable oxygen evolution reaction catalysts in acid via confinement engineering.
二氧化钌作为一种在酸性条件下具有潜力的析氧反应催化剂，已引起广泛关注。然而，RuO过度氧化成可溶性HRuO物种会导致耐久性较差，这阻碍了RuO在质子交换膜水电解中的实际应用。在此，我们报道了一种限域策略，通过富集原位形成的高局部浓度HRuO物种，可通过将氧化还原平衡从RuO过度氧化转移，有效抑制RuO降解，极大提高其在酸性析氧过程中的耐久性。因此，限域RuO催化剂能够在10 mA cm下连续运行超过400小时，衰减可忽略不计，其稳定性数比非限域RuO催化剂高14.8倍。使用限域RuO催化剂作为阳极的电解槽在500 mA cm和60°C下显示出300小时的显著耐久性。这项工作展示了一种通过限域工程设计耐用酸性析氧反应催化剂的有前景的策略。
