Adv. Mater.: Conductive Cation Traps for Synthesizing Efficient and Stable Perovskite Catalysts

Authors：

Tongbao Wang¹, Chao Yang², Fupeng Cheng³, Bin Song^1,4, Tong Liu⁵, Xiwen Tan¹, Quan Chen¹, Ziyun Wang⁶, Fengwang Li⁷, Chengzhi Guan³*, Gengfeng Zheng²*, Yuhang Wang¹*

Institutions：

¹State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, China

²Laboratory of Advanced Materials, Department of Chemistry, Fudan University, Shanghai, China

³Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China

⁴Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, China

⁵i-LAB, Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China

⁶School of Chemical Sciences, The University of Auckland, Auckland, New Zealand 

⁷School of Chemical and Biomolecular Engineering and ARC Centre of Excellence for Green Electrochemical Transformation of Carbon Dioxide, The University of Sydney, Sydney, NSW, Australia

Abstract：

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 Sr²⁺ 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 Sr²⁺ cation trap by introducing SrMoO₄ during cell fabrication, which partially transforms into conductive SrMoO₃ under reducing conditions. In the scenario of the high-temperature CO₂ reduction reaction (HT-CO₂RR), this conductive cation trap effectively prevents Sr²⁺ segregation in electrochemically inert SrCO₃ phases, concurrently enhancing electrode conductivity and electrocatalytic activity. As a result, we demonstrate, using catalysts consisting of Pr_0.90Sr_0.10Co_0.95Cu_0.05O_3-δ and 19 wt.% SrMoO₄, a one-order-magnitude reduction of degradation rate compared to the case without cation trapping. We report a current density of 3 A cm⁻² 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⁻² without degradation.

IF：

26.8

Link：

https://doi.org/10.1002/adma.202521954