Our group investigated how alkaline-earth elements (Ca, Sr and Ba) influence the performance of the parent LaFeO_3-δ as cathode for CO₂ electroreduction in solid oxide electrolysis cells. Sr is the best choice among the three alkaline-earth elements. The optimal doping amount of Sr is 20% in the La-site. This work has been published in Journal of Power Sources, 2019, 443, 227268-227277.