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Pulse-mode electrochemical reduction of carbon dioxide using copper and copper oxide electrodes for selective ethylene formation

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Abstract

Although the electrochemical reduction of CO2 at a copper electrode produces hydrocarbons, the activity for the conversion of CO2 is significantly reduced after several tens of minutes by the deposition of poisoning species on the electrode. In order to solve the poisoning species problem, the electrochemical reduction of CO2 was carried out using a copper electrode in the pulse electrolysis mode by anodic as well as cathodic polarization. The anodic polarization intervals suppressed the deposition of the poisoning species on the electrode, and the amount of two hydrocarbons produced, CH4 and C2H6, decreased only slightly even after one hour. By choosing the appropriate anodic potential and time duration the selectivity for C2H6 formation was significantly enhanced. The enhancement was found to be due to the copper oxide formed on the copper electrode. The selectivity was further improved when the electrochemical reduction was carried out using a copper oxide electrode. The highest efficiency of about 28% was obtained at −3.15 V.

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Authors and Affiliations

  1. Department of Engineering Science, Niihama National College of Technology, Yagumocho 7-1, Niihama, Ehime, 792-8580, Japan

    J. Yano & S. Yamasaki

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  1. J. Yano
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  2. S. Yamasaki
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Correspondence to J. Yano.

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Yano, J., Yamasaki, S. Pulse-mode electrochemical reduction of carbon dioxide using copper and copper oxide electrodes for selective ethylene formation. J Appl Electrochem 38, 1721–1726 (2008). https://doi.org/10.1007/s10800-008-9622-3

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  • DOI: https://doi.org/10.1007/s10800-008-9622-3

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