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Title: Mechanism of CO2 Reduction at Copper Surfaces: Pathways to C2 Products

Journal Article · · ACS Catalysis
 [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
  3. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry

On the basis of constraints from reported experimental observations and density functional theory simulations, in this paper we propose a mechanism for the reduction of CO2 to C2 products on copper electrodes. To model the effects of an applied potential bias on the reactions, calculations are carried out with a variable, fractional number of electrons on the unit cell, which is optimized so that the Fermi level matches the actual chemical potential of electrons (i.e., the applied bias); an implicit electrolyte model allows for compensation of the surface charge so that neutrality is maintained in the overall simulation cell. Our mechanism explains the presence of the seven C2 species that have been detected in the reaction, as well as other notable experimental observations. Furthermore, our results shed light on the difference in activities toward C2 products between the (100) and (111) facets of copper. Finally, we compare our methodologies and findings with those in other recent mechanistic studies of the copper-catalyzed CO2 reduction reaction.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; SC0004993
OSTI ID:
1464161
Journal Information:
ACS Catalysis, Vol. 8, Issue 2; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 420 works
Citation information provided by
Web of Science

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Electrochemical CO 2 reduction on Cu and Au electrodes studied using in situ sum frequency generation spectroscopy journal January 2019
Highly Selective Production of Ethylene by the Electroreduction of Carbon Monoxide journal December 2019
Review of two‐dimensional materials for electrochemical CO 2 reduction from a theoretical perspective journal April 2019
Carbon monoxide electroreduction as an emerging platform for carbon utilization journal December 2019
Metal-free graphdiyne doped with sp-hybridized boron and nitrogen atoms at acetylenic sites for high-efficiency electroreduction of CO 2 to CH 4 and C 2 H 4 journal January 2019
Atomic Layer Deposition of ZnO on CuO Enables Selective and Efficient Electroreduction of Carbon Dioxide to Liquid Fuels journal September 2019
Linkage Effect in the Heterogenization of Cobalt Complexes by Doped Graphene for Electrocatalytic CO 2 Reduction journal August 2019
High-rate electroreduction of carbon monoxide to multi-carbon products journal August 2018
Reaction intermediates during operando electrocatalysis identified from full solvent quantum mechanics molecular dynamics journal March 2019
Heterogeneous catalysts for catalytic CO2 conversion into value-added chemicals journal March 2019
Mechanism and kinetics for both thermal and electrochemical reduction of N 2 catalysed by Ru(0001) based on quantum mechanics journal January 2019
Silicon-doped graphene edges: an efficient metal-free catalyst for the reduction of CO 2 into methanol and ethanol journal January 2019
Reduction of carbon dioxide on photoexcited nanoparticles of VIII group metals journal January 2019
Regulating C–C coupling in thermocatalytic and electrocatalytic CO x conversion based on surface science journal January 2019
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Figures / Tables (8)