Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 47, Pages 14164-14168Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507629
Keywords
CO2 reduction; electrolysis; formate; ionic liquids; superbases
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Funding
- 4CU programme grant
- Engineering and Physical Sciences Research Council (EPSRC) [EP/K001329/1]
- ELSOL workshop, Researcher Links
- FAPESP
- Newton fund
- RSC
- CNPq
- Engineering and Physical Sciences Research Council [EP/K035355/2, EP/K001329/1] Funding Source: researchfish
- EPSRC [EP/K035355/2, EP/K001329/1] Funding Source: UKRI
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A new low-energy pathway is reported for the electrochemical reduction of CO2 to formate and syngas at low overpotentials, utilizing a reactive ionic liquid as the solvent. The superbasic tetraalkyl phosphonium ionic liquid [P-66614][124Triz] is able to chemisorb CO2 through equimolar binding of CO2 with the 1,2,4-triazole anion. This chemisorbed CO2 can be reduced at silver electrodes at overpotentials as low as 0.17 V, forming formate. In contrast, physically absorbed CO2 within the same ionic liquid or in ionic liquids where chemisorption is impossible (such as [P-66614][NTf2]) undergoes reduction at significantly increased overpotentials, producing only CO as the product.
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