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Title: CO2 Reduction Selective for C≥2 Products on Polycrystalline Copper with N-Substituted Pyridinium Additives

Journal Article · · ACS Central Science
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  1. Division of Chemistry and Chemical Engineering and Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, United States

Electrocatalytic CO2 reduction to generate multicarbon products is of interest for applications in artificial photosynthetic schemes. This is a particularly attractive goal for CO2 reduction by copper electrodes, where a broad range of hydrocarbon products can be generated but where selectivity for C–C coupled products relative to CH4 and H2 remains an impediment. Herein we report a simple yet highly selective catalytic system for CO2 reduction to C≥2 hydrocarbons on a polycrystalline Cu electrode in bicarbonate aqueous solution that uses N-substituted pyridinium additives. Selectivities of 70–80% for C2 and C3 products with a hydrocarbon ratio of C≥2/CH4 significantly greater than 100 have been observed with several additives. 13C-labeling studies verify CO2 to be the sole carbon source in the C≥2 hydrocarbons produced. Upon electroreduction, the N-substituted pyridinium additives lead to film deposition on the Cu electrode, identified in one case as the reductive coupling product of N-arylpyridinium. As a result, product selectivity can also be tuned from C≥2 species to H2 (~90%) while suppressing methane with certain N-heterocyclic additives.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0004993
OSTI ID:
1372119
Alternate ID(s):
OSTI ID: 1417626
Journal Information:
ACS Central Science, Journal Name: ACS Central Science; ISSN 2374-7943
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 162 works
Citation information provided by
Web of Science

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  • Barton Cole, Emily; Lakkaraju, Prasad S.; Rampulla, David M.
  • Journal of the American Chemical Society, Vol. 132, Issue 33, p. 11539-11551 https://doi.org/10.1021/ja1023496
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