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B-Site-Metal-Mediated Coke-Resistant CO2 Electrolysis on Perovskite Surfaces
Tongbao Wang1,2, Yu Mao3, Pengfei Ou4
1State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou, Jiangsu, 215123, China.
None:
High-temperature CO2 reduction to CO using perovskite-oxide-based solid oxide electrochemical cells holds promise for carbon-neutral chemical production, yet currently faces the challenge of coke formation that leads to device failure. A key reason behind this challenge is the absence of a correlation between the coke formation mechanism and perovskite structures. Here, lanthanum strontium cobalt ferrite perovskites are taken with a classical ABO3 structure as examples to study coke formation on them and unravel the dependence of coke resistance on the Fe stoichiometry. Lowering the Co versus Fe ratio suppresses B-site metal exsolution, and thus, coke formation is catalyzed by these metals/alloys. Using (La0.6Sr0.4)0.95Co0.2Fe0.8O3-δ as an example, this study reports an outlet CO pressure of 0.86 ± 0.02 atm at 800 °C, closely approaching the thermodynamic threshold for coking. The cell offers a stable outlet CO pressure of ≈0.8 atm in 320-h electrolysis at 220 mA cm-2 and the potential to build a high-performance tandem system for efficient electrosynthesis of multi-carbon products from CO2.
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