La1−xSrxFeO3 perovskite electrocatalysts for asymmetric electrocarboxylation of acetophenone with CO2. (1st December 2021)

• Record Type: Journal Article
• Authors: Yang, Li-Rong; Zhang, Jing-Jie; Zhao, Yi-Jun; Wang, Zhuo-Lin; Wang, Huan; Lu, Jia-Xing
• Is Part Of: Electrochimica acta. Volume 398(2021)
• Publication Date: 2021-12-01
• Subjects: Asymmetric electrocarboxylation -- CO2 -- Acetophenone -- CoII-(R, R)(salen) -- La1−xSrxFeO3; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.139308
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The use of La1−x Srx FeO3 (x= 0, 0.1, 0.2, 0.3, 0.4 and 0.5) cathodes in asymmetric electrocarboxylation of acetophenone with CO2 induced by chiral auxiliary Co II -(salen) was investigated for the first time. Optically active 2-hydroxy-2-phenylpropionic acid with 94% enantiomeric excess and 68% yield were obtained. The superior asymmetric electrocarboxylation performance may derive from the Fe 4+ species and the increased lattice oxygen concentration on the surface of La0.7 Sr0.3 FeO3 (LSF-0.3) induced by Sr-doping, together with an accelerated electron transfer and an increased electrochemically active surface area. Here, perovskite oxide catalyst has an acid function, which is supplied by Fe 4+ ions, can participate in the reaction by coordinating with acetophenone. Moreover, the LSF-0.3 has considerable stability and reusability. By cyclic voltammograms and contrast experiments, a mechanism was proposed for the asymmetric electrocarboxylation reaction. Graphical abstract: Image, graphical abstract The superior asymmetric electrocarboxylation performance for La0.7 Sr0.3 FeO3 cathode may stem from the increased concentration of O 2– and Fe 4+, together with an accelerated electron transfer and an increased electrochemically active surface area.