Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 7, Pages 1394-1405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00116
Keywords
CO2 capture; Electrochemical separation; Electrochemistry; Quinone; Ionic liquid; Tricyanomethanide; Solvachromatism; Polarity
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Funding
- ARPA-E (Advanced Research Projects Agency-Energy) [DE-AR0000083]
- Saudi Aramco under the MIT Energy Initiative program
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We report the redox activity of quinone materials, in the presence of ionic liquids, with the ability to bind reversibly to CO2. The reduction potential at which 1,4-naphthoquinone transforms to the quinone dianion depends on the strength of the hydrogen-bonding characteristics of the ionic liquid solvent; under CO2, this transformation occurs at much lower potentials than in a CO2-inert environment. In the absence of CO2, two consecutive reduction steps are required to form first the radical anion and then the dianion, but with the quinones considered here, a single mixture two-electron wave reduction with simultaneous binding of CO2 occurs. In particular, the 1,4-napthoquinone and 1-ethyl-3-methylimidazolium tricyanomethanide, [emim] [tcm], system reported here shows a higher quinone solubility (0.6 and 1.9 mol-L-1 at 22 and 60 degrees C, respectively) compared to other ionic liquids and most common solvents. The high polarity determined through the Kamlet-Taft parameters for [emim] [tcm] explains the measured solubility of quinone. The achieved high quinone solubility enables effective CO2 separation from the dilute gas mixture that is contact with the cathode by overcoming back-diffusive transport of CO2 from the anodic side.
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