Journal article
Efficient Electrocatalytic Reduction of Carbon Dioxide in 1‑Ethyl-3-methylimidazolium Trifluoromethanesulfonate and Water Mixtures
Energy & fuels, Vol.32(12), pp.12695-12702
12/20/2018
DOI: 10.1021/acs.energyfuels.8b02750
Abstract
The catalytic activity of room-temperature ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf]) for carbon dioxide (CO2) reduction is reported on a polycrystalline silver electrode as a function of the water content and solution pH. The optimal aqueous dilution was determined to be ca. 10% (v/v), resulting in a reduction of the overpotential required to reduce CO2 in [EMIM][OTf] by 400 mV. The reduction process and products are largely insensitive to pH. CO2 reduction in [EMIM][OTf] with 10% 0.1 M NaHCO3 is achieved with high selectivity for CO with 93.0 ± 4.6% Faradaic efficiency. Hydrogen evolution reaction (HER) is suppressed in the range of neat [EMIM][OTf] (500 ppm water content) to a [EMIM][OTf]/H2O mixture of 10% water content. Conductivity and viscosity of the [EMIM][OTf]/H2O mixture suggest that the ionic liquid ion pair fully dissociates, analogous to dilute KCl solution, where each ion is completely hydrated by water molecules.
Details
- Title: Subtitle
- Efficient Electrocatalytic Reduction of Carbon Dioxide in 1‑Ethyl-3-methylimidazolium Trifluoromethanesulfonate and Water Mixtures
- Creators
- Amanuel HailuScott K Shaw
- Resource Type
- Journal article
- Publication Details
- Energy & fuels, Vol.32(12), pp.12695-12702
- Publisher
- American Chemical Society
- DOI
- 10.1021/acs.energyfuels.8b02750
- ISSN
- 0887-0624
- eISSN
- 1520-5029
- Grant note
- DOI: 10.13039/100006770, name: American Chemical Society Petroleum Research Fund, award: 55279-DNI5
- Language
- English
- Date published
- 12/20/2018
- Academic Unit
- Chemistry
- Record Identifier
- 9983985956402771
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