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Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure

Haywood, Stephanie K.; Rybchenko, Sergey I.; Touhami, Dalila; Wadhawan, Jay D.

Authors

Stephanie K. Haywood

Dalila Touhami



Abstract

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The recently proposed highly efficient route of pyridine-catalyzed CO 2 reduction to methanol was explored on platinum electrodes at high CO 2 pressure. At 55 bar (5.5 MPa) of CO 2 , the bulk electrolysis in both potentiostatic and galvanostatic regimes resulted in methanol production with Faradaic yields of up to 10 % for the first 5–10 C cm −2 of charge passed. For longer electrolysis, the methanol concentration failed to increase proportionally and was limited to sub-ppm levels irrespective of biasing conditions and pyridine concentration. This limitation cannot be removed by electrode reactivation and/or pre-electrolysis and appears to be an inherent feature of the reduction process. In agreement with bulk electrolysis findings, the CV analysis supported by simulation indicated that hydrogen evolution is still the dominant electrode reaction in pyridine-containing electrolyte solution, even with an excess CO 2 concentration in the solution. No prominent contribution from either a direct or coupled CO 2 reduction was found. The results obtained suggest that the reduction of CO 2 to methanol is a transient process that is largely decoupled from the electrode charge transfer.

Journal Article Type Article
Publication Date Jun 7, 2016
Journal Chemsuschem
Print ISSN 1864-5631
Electronic ISSN 1864-564X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 9
Issue 13
Pages 1660-1669
APA6 Citation Haywood, S. K., Rybchenko, S. I., Touhami, D., & Wadhawan, J. D. (2016). Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure. ChemSusChem, 9(13), 1660-1669 . https://doi.org/10.1002/cssc.201600267
DOI https://doi.org/10.1002/cssc.201600267
Keywords Carbon dioxide; Catalysis; Electrochemical reduction; High pressure; Pyridine
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/cssc.201600267/abstract
Additional Information Authors' accepted manuscript of article published in: Chemsuschem, 2016, v.9, issue 13.

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