Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 11, Pages 4464-4469Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912412
Keywords
CO reduction reaction (CORR); copper; C2+ products; electrochemistry; sodium cations
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Funding
- National Key Research and Development Program of China [2017YFA0208200]
- National Natural Science Foundation of China [21872079, 21606142]
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Highly alkaline electrolytes have been shown to improve the formation rate of C2+ products in the electrochemical reduction of carbon dioxide (CO2) and carbon monoxide (CO) on copper surfaces, with the assumption that higher OH- concentrations promote the C-C coupling chemistry. Herein, by systematically varying the concentration of Na+ and OH- at the same absolute electrode potential, we demonstrate that higher concentrations of cations (Na+), rather than OH-, exert the main promotional effect on the production of C2+ products. The impact of the nature and the concentration of cations on the electrochemical reduction of CO is supported by experiments in which a fraction or all of Na+ is chelated by a crown ether. Chelation of Na+ leads to drastic decrease in the formation rate of C2+ products. The promotional effect of OH- determined at the same potential on the reversible hydrogen electrode scale is likely caused by larger overpotentials at higher electrolyte pH.
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