La-Substituted BaSnO Perovskite as a Robust Electrocatalyst for Selective CO Reduction to Formate.

Rational design of high-performance catalysts for CO electroreduction is crucial for achieving carbon neutrality, yet effective modification strategies remain scarce. In this study, we present the microwave heating approach to incorporate La ions into Sn-based perovskite oxides, significantly enhancing their electrocatalytic performance for the reduction of CO to formate. Through comprehensive characterization techniques, including X-ray photoelectron spectroscopy, synchrotron radiation X-ray absorption spectroscopy, electrochemical measurements (Tafel analysis and impedance spectroscopy), and density functional theory calculations, we demonstrate that La substitution effectively modulates the Sn-O bond distance in BaSnO.