A rational design of manganese electrocatalysts for Lewis acid-assisted carbon dioxide reduction. Issue 17 (12th April 2019)

• Record Type: Journal Article
• Authors: Wang, Xiaoli; Ma, Haiyan; Meng, Caiyun; Chen, Dezhan; Huang, Fang
• Is Part Of: Physical chemistry chemical physics. Volume 21:Issue 17(2019)
• Page Start: 8849
• Page End: 8855
• Publication Date: 2019-04-12
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c9cp00514e
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Based on the mechanisms of CO2 electroreduction by Mn(mesbpy)(CO)3 Br, a formyl-substituted Mn complex is predicted to be a more effective electrocatalyst. Abstract : Herein, the mechanisms of Brønsted acid- and Lewis acid-assisted CO2 electroreduction by Mn(mesbpy)(CO)3 Br (1 ) were investigated by density functional theory calculations. Our results indicate that for the Lewis acid-assisted cycle, an energy sink (13 ) is present owing to the interaction between Mg(OTf)2 and activated CO2, which is disadvantageous to the apparent activation energy (Δ G ≠ ). Moreover, a series of substituted13 counterparts were investigated to reduce the energy sink and decrease Δ G ≠ . Based on our study on the substituent effect, an excellent linear relationship was found between 2 e reduction potentials and LUMO energies of substituted1, and a moderate linear relationship was observed between Δ G of substituted13 and the 2 e reduction potential of substituted1 counterparts. Moreover, for the CO2 reduction assisted by a Lewis acid, the formyl-substituted complexR8 has been predicted to be a more effective catalyst with lower overpotential and higher catalytic activity than its parent complex1 .