Wang Tongbao, Yang Chao, Cheng Fupeng, Song Bin, Liu Tong, Tan Xiwen, Chen Quan, Wang Ziyun, Li Fengwang, Guan Chengzhi, Zheng Gengfeng, Wang Yuhang
State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, China.
Laboratory of Advanced Materials, Department of Chemistry, Fudan University, Shanghai, China.
Adv Mater. 2026 Feb;38(10):e21954. doi: 10.1002/adma.202521954. Epub 2025 Dec 31.
Perovskite oxides are promising material candidates for many important catalytic and energy conversion processes. Strontium doping at the A sites of perovskite oxides can potentially enhance their performance in these applications. However, the segregation of Sr to form inert phases, driven by its enrichment on surfaces, renders perovskite oxide materials unstable and inefficient during long-term operation. Here, we design a Sr cation trap by introducing SrMoO during cell fabrication, which partially transforms into conductive SrMoO under reducing conditions. In the scenario of the high-temperature CO reduction reaction (HT-CORR), this conductive cation trap effectively prevents Sr segregation in electrochemically inert SrCO phases, concurrently enhancing electrode conductivity and electrocatalytic activity. As a result, we demonstrate, using catalysts consisting of PrSrCoCuO and 19 wt.% SrMoO, a one-order-magnitude reduction of degradation rate compared to the case without cation trapping. We report a current density of 3 A cm at 1.57 V, along with near-unity Faradaic efficiencies (FEs) for CO, energy efficiencies (EEs) exceeding 70%, and stable operation for over 160 h at 1 A cm without degradation.
