We discovered the correlation between the B-site metals of La0.6Sr0.4Co1-xFexO3-δ and their coke resistance during high-temperature CO2 electrolysis. Elevated Fe/Co ratios enhance the coke resistance by suppressing excessive oxygen vacancy formation and Co/Fe exsolution. This underlying mechanism enables highly stable CO2 electrolysis performance and a tandem reactor for multi-carbon product synthesis with high CO2 utilization efficiency. Details can be found in Adv. Sci..
