Journal
ENERGY & FUELS
Volume 32, Issue 12, Pages 12695-12702Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.8b02750
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- American Chemical Society's Petroleum Research Fund (PRF) [55279-DNI5]
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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][OTE] (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.
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