Zhang Jiahao, Fu Xianbiao, Kwon Soonho, Chen Kaifeng, Liu Xiaozhi, Yang Jin, Sun Haoran, Wang Yanchang, Uchiyama Tomoki, Uchimoto Yoshiharu, Li Shaofeng, Li Yan, Fan Xiaolong, Chen Gong, Xia Fanjie, Wu Jinsong, Li Yanbo, Yue Qin, Qiao Liang, Su Dong, Zhou Hua, Goddard William A, Kang Yijin
School of Chemical Engineering, Sichuan University, Chengdu, China.
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China.
Science. 2025 Jan 3;387(6729):48-55. doi: 10.1126/science.ado9938. Epub 2025 Jan 2.
The iridium oxide (IrO) catalyst for the oxygen evolution reaction used industrially (in proton exchange membrane water electrolyzers) is scarce and costly. Although ruthenium oxide (RuO) is a promising alternative, its poor stability has hindered practical application. We used well-defined extended surface models to identify that RuO undergoes structure-dependent corrosion that causes Ru dissolution. Tantalum (Ta) doping effectively stabilized RuO against such corrosion and enhanced the intrinsic activity of RuO. In an industrial demonstration, Ta-RuO electrocatalyst exhibited stability near that of IrO and had a performance decay rate of ~14 microvolts per hour in a 2800-hour test. At current densities of 1 ampere per square centimeter, it had an overpotential 330 millivolts less than that of IrO.
工业上用于析氧反应（在质子交换膜水电解槽中）的氧化铱（IrO）催化剂稀缺且昂贵。尽管氧化钌（RuO）是一种有前景的替代品，但其稳定性差阻碍了实际应用。我们使用明确的扩展表面模型来确定RuO会发生与结构相关的腐蚀，从而导致Ru溶解。钽（Ta）掺杂有效地稳定了RuO以抵抗这种腐蚀，并提高了RuO的本征活性。在工业示范中，Ta-RuO电催化剂表现出接近IrO的稳定性，在2800小时的测试中性能衰减率约为每小时14微伏。在每平方厘米1安培的电流密度下，其过电位比IrO低330毫伏。
