Lum, Yanwei and Cheng, Tao and Goddard, William A., III and Ager, Joel W. (2018) Electrochemical CO reduction builds solvent water into oxygenate products. Journal of the American Chemical Society, 140 (30). pp. 9337-9340. ISSN 0002-7863. doi:10.1021/jacs.8b03986. https://resolver.caltech.edu/CaltechAUTHORS:20180716-093223969
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Abstract
Numerous studies have examined the electrochemical reduction of CO (COR) to oxygenates (e.g., ethanol). None have considered the possibility that oxygen in the product might arise from water rather than from CO. To test this assumption, C^(16)O reduction was performed in H_2^(18)O electrolyte. Surprisingly, we found that 60–70% of the ethanol contained 18O, which must have originated from the solvent. We extended our previous all-solvent density functional theory metadynamics calculations to consider the possibility of incorporating water, and indeed, we found a new mechanism involving a Grotthuss chain of six water molecules in a concerted reaction with the *C–CH intermediate to form *CH–CH(^(18)OH), subsequently leading to (^(18)O)ethanol. This competes with the formation of ethylene that also arises from *C–CH. These unforeseen results suggest that all previous studies of COR under aqueous conditions must be reexamined.
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| Additional Information: | © 2018 American Chemical Society. Received: April 13, 2018; Published: July 16, 2018. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub supported through the Office of Science of the U.S. Department of Energy under Award DE-SC0004993. Y.L. acknowledges the support of an A*STAR National Science Scholarship. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1548562. We thank Lingfei Wei for assistance with technical illustrations. Author Contributions: Y.L. and T.C. contributed equally. The authors declare no competing financial interest. | |||||||||
| Group: | JCAP | |||||||||
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| Issue or Number: | 30 | |||||||||
| DOI: | 10.1021/jacs.8b03986 | |||||||||
| Record Number: | CaltechAUTHORS:20180716-093223969 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180716-093223969 | |||||||||
| Official Citation: | Electrochemical CO Reduction Builds Solvent Water into Oxygenate Products Yanwei Lum, Tao Cheng, William A. Goddard, III, and Joel W. Ager Journal of the American Chemical Society 2018 140 (30), 9337-9340 DOI: 10.1021/jacs.8b03986 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 87870 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 16 Jul 2018 16:46 | |||||||||
| Last Modified: | 16 Nov 2021 00:21 |
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