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Understanding imidazolium-based ionic liquids role in the CO₂ electroreduction reaction: experimental and theoretical study

Alessia Fortunati1, Francesca Risplendi1*, Michele Re Fiorentin1, Giancarlo Cicero1, Emmanuele Parisi1, Micaela Castellino1, Elena Simone1, Boyan Iliev2, Thomas Schubert2, Nunzio Russo1, Simelys Hernández1*

1 Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy

2 Iolitec Ionic Liquids Technologies GmbH, Im Zukunftspark 9, 74076 Heilbronn, Germany

* Corresponding authors emails: francesca.risplendi@polito.it, simelys.hernandez@polito.it
DOI10.24435/materialscloud:7w-zr [version v1]

Publication date: Mar 31, 2023

How to cite this record

Alessia Fortunati, Francesca Risplendi, Michele Re Fiorentin, Giancarlo Cicero, Emmanuele Parisi, Micaela Castellino, Elena Simone, Boyan Iliev, Thomas Schubert, Nunzio Russo, Simelys Hernández, Understanding imidazolium-based ionic liquids role in the CO₂ electroreduction reaction: experimental and theoretical study, Materials Cloud Archive 2023.53 (2023), https://doi.org/10.24435/materialscloud:7w-zr


Seven imidazolium-based ionic liquids (ILs) with different anions and cations were investigated as catholytes for the CO₂ electrocatalytic reduction to CO over silver. A significant activity and stability, but different selectivities for CO₂ reduction or the side H₂ evolution were observed. Density functional theory results show that the role of the IL anions is to tune the ratio between the CO₂ captured and electrochemically converted. Acetate anions (being strong Lewis bases) are more prone to CO₂ capture, enhancing H₂ evolution, while fluorinated anions (being weaker Lewis bases) favour the CO₂ electroreduction. Differently from the hydrolytically unstable 1-butyl-3-methylimidazolium tetrafluoroborate, 1-Butyl-3-Methylimidazolium Triflate was the most promising IL showing the highest Faradaic efficiency to CO (>95%), up to 8h of stable operation at high current rates (-20mA & -60 mA). These results open the way for a strategic selection of the most suitable IL for the CO₂ electroreduction and its future process scale-up.

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Journal reference (Paper in which the method is described and data are discussed in support to the experimental evidences.)
A. Fortunati, F. Risplendi1, M. Re Fiorentin, G. Cicero, E. Parisi, M. Castellino, E. Simone, B. Iliev, T.J.S. Schubert, N. Russo, S. Hernández, Communications Chemistry (accepted)


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Version history:

2023.53 (version v1) [This version] Mar 31, 2023 DOI10.24435/materialscloud:7w-zr