Skip to Main content Skip to Navigation
Journal articles

Imidazolium- and Pyrrolidinium-Based Ionic Liquids as Co-catalysts for CO2 Electroreduction in Model Molecular Electrocatalysis

Abstract : The structure effect on the role of different ionic liquids (ILs) as simultaneous supporting electrolyte and co-catalyst for CO2 electroreduction in the presence of a model molecular catalyst [Re(bpy)(CO)3Cl] has not been addressed yet. In particular, we varied the nature of the cation, anion and cation alkyl chain by a choice of 5 different ILs, including imidazolium and pyrrolidinium cations and we compared their results to benchmark supporting electrolyte. We report an overpotential diminution of 0.33 V for CO2 to CO conversion in the presence of ILs under CO2 catalytic conditions. We prove the IL cation-dependent overpotential diminution due to the electrostatic stabilization of the negatively-charged active form of the catalyst, being the π-π stacking interaction provided by imidazolium cations responsible for their outstanding performance. Finally, a mechanistic explanation is provided to justify a weaker IL co-catalytic effect when CO2 electroreduction takes place in the presence of a proton source.
Document type :
Journal articles
Complete list of metadata

https://hal.sorbonne-universite.fr/hal-03027294
Contributor : Véronique Martin <>
Submitted on : Friday, November 27, 2020 - 9:45:37 AM
Last modification on : Friday, January 8, 2021 - 6:00:02 PM
Long-term archiving on: : Sunday, February 28, 2021 - 6:43:58 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2021-04-14

Please log in to resquest access to the document

Identifiers

Citation

Elli Vichou, Yun Li, Maria Gomez-Mingot, Marc Fontecave, Carlos Sánchez- Sánchez. Imidazolium- and Pyrrolidinium-Based Ionic Liquids as Co-catalysts for CO2 Electroreduction in Model Molecular Electrocatalysis. Journal of Physical Chemistry C, American Chemical Society, 2020, 124 (43), pp.23764-23772. ⟨10.1021/acs.jpcc.0c07556⟩. ⟨hal-03027294⟩

Share

Metrics

Record views

104