- Date de réalisation : 15 Juin 2021
- Durée du programme : 35 min
- Classification Dewey : Chimie et sciences connexes
Dans la même collectionJuan Matos - H2 production on 1D and 2D Carbon-containing Fe-, Co, and Ni-based foamy catalysts. Athanasios G. Konstandopoulos - Material and Reactor Technologies for Solar Fuels Sixto Malato - Solar photocatalytic hydrogen production at pilot scale Pascal Brault - Reactive molecular dynamics simulations of H2 production and conversion Olivier Joubert - Brief Overview of Current French Hydrogen Research Activities, Focus on Materials Ally Aukaloo - From molecular to nanostructured materials for artificial photosynthesis
Carlos Sanchez - Electrolyte engineering for electrochemical CO2 reduction
Ionic liquids (ILs) in electrocatalysis have attracted a lot of attention from the seminal work of Rosen et al.  where they achieved a relevant overpotential decrease for CO2 reduction reaction (CO2RR) on a silver electrode. Moreover, ILs have been proposed as organic promoters for enhancing the catalytic activity by modifying the electrostatic properties at the electrochemical interface. Then, electrolyte engineering has become a powerful way to impact on the stability of reaction intermediates and control reaction selectivity.
The role of different ILs as simultaneous supporting electrolyte and co-catalyst in acetonitrile for CO2 electroreduction in the presence of a model molecular catalyst [Re(bpy)(CO)3Cl] is presented here.  In particular, the nature of the cation, anion and cation alkyl chain is varied by a choice of 5 different ILs, including imidazolium and pyrrolidinium cations and their results are compared to conventional benchmark supporting electrolyte. Under catalytic conditions an overpotential diminution of 0.33 V for CO2 to CO conversion is achieved in the presence of ILs. Finally, a mechanistic explanation is provided to justify this behaviour.
 Rosen, B.A.; Salehi-Khojin, A.; Thorson, M.R.; Zhu, W.; Whipple, D.T.; Kenis, P.J.A.; Masel, R.I. Science 2011, 334 (6056), 643.
 Vichou, E.; Xu-Li, Y.; Gomez-Mingot, M.; Fontecave, M.; Sánchez-Sánchez, C.M. J. Phys. Chem. C 2020, 124, 23764.