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Electrochemical Reduction of Protic Supercritical CO 2 on Copper Electrodes
The electrochemical reduction of carbon dioxide is usually studied in aqueous solutions under ambient conditions. However, the main disadvantages of this method are high hydrogen evolution and low faradaic efficiencies of carbon-based products. Supercritical CO (scCO ) can be used as a solvent itsel...
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Published in: | ChemSusChem 2017-09, Vol.10 (18), p.3660-3670 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The electrochemical reduction of carbon dioxide is usually studied in aqueous solutions under ambient conditions. However, the main disadvantages of this method are high hydrogen evolution and low faradaic efficiencies of carbon-based products. Supercritical CO
(scCO
) can be used as a solvent itself to suppresses hydrogen evolution and tune the carbon-based product yield; however, it has received little attention for this purpose. Therefore, the focus of this study was on the electrochemical reduction of scCO
. The conductivity of scCO
was increased through the addition of supporting electrolyte and a cosolvent (acetonitrile). Furthermore, the addition of protic solutions of different pH to scCO
was investigated. 1 m H
SO
, trifluoroethanol, H
O, KOH, and CsHCO
solutions were used to determine the effect on current density, faradaic efficiency, and selectivity of the scCO
reduction. The reduction of scCO
to methanol and ethanol are reported for the first time. However, methane and ethylene were not observed. Additionally, corrosion of the Cu electrode was noticed. |
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ISSN: | 1864-5631 1864-564X |
DOI: | 10.1002/cssc.201701205 |