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Communication Dans Un Congrès Année : 2021

Electrolyte engineering for electrochemical CO2 reduction

Résumé

Ionic liquids (ILs) in electrocatalysis have attracted a lot of attention from the seminal work of Rosen et al. [1] 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. [2] 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. [1] 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. [2] Vichou, E.; Xu‐Li, Y.; Gomez‐Mingot, M.; Fontecave, M.; Sánchez‐Sánchez, C.M. J. Phys. Chem. C 2020, 124, 23764.

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Chimie
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Dates et versions

hal-04028489 , version 1 (14-03-2023)

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  • HAL Id : hal-04028489 , version 1

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Carlos M Sánchez-Sánchez. Electrolyte engineering for electrochemical CO2 reduction. Le Studium International Conference virtuel Meeting, Jun 2021, On line, France. ⟨hal-04028489⟩
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