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Title: Electrochemical CO2 Reduction over Compressively Strained CuAg Surface Alloys with Enhanced Multi-Carbon Oxygenate Selectivity

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b08607· OSTI ID:1463311

The electrochemical reduction of carbon dioxide using renewably generated electricity offers a potential means for producing fuels and chemicals in a sustainable manner. To date, copper has been found to be the most effective catalyst for electrochemically reducing carbon dioxide to products such as methane, ethene, and ethanol. Unfortunately, the current efficiency of the process is limited by competition with the relatively facile hydrogen evolution reaction. Since multi-carbon products are more valuable precursors to chemicals and fuels than methane, there is considerable interest in modifying copper to enhance the multi-carbon product selectivity. In this paper, we report our investigations of electrochemical carbon dioxide reduction over CuAg bimetallic electrodes and surface alloys, which we find to be more selective for the formation of multi-carbon products than pure copper. This selectivity enhancement is a result of the selective suppression of hydrogen evolution, which occurs due to compressive strain induced by the formation of a CuAg surface alloy. Furthermore, we report that these bimetallic electrocatalysts exhibit an unusually high selectivity for the formation of multi-carbon carbonyl-containing products, which we hypothesize to be the consequence of a reduced coverage of adsorbed hydrogen and the reduced oxophilicity of the compressively strained copper. Thus and finally, we show that promoting copper surface with small amounts of Ag is a promising means for improving the multi-carbon oxygenated product selectivity of copper during electrochemical CO2 reduction.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; SC0004993; AC02-05CH11231
OSTI ID:
1463311
Alternate ID(s):
OSTI ID: 1436343
Journal Information:
Journal of the American Chemical Society, Vol. 139, Issue 44; ISSN 0002-7863
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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Nanostructured Copper-Based Electrocatalysts for CO 2 Reduction journal July 2018
Selective and Low Overpotential Electrochemical CO2 Reduction to Formate on CuS Decorated CuO Heterostructure journal January 2019
Intrinsic Carbon‐Defect‐Driven Electrocatalytic Reduction of Carbon Dioxide journal March 2019
Low-Coordinated Edge Sites on Ultrathin Palladium Nanosheets Boost Carbon Dioxide Electroreduction Performance journal July 2018
Structure‐Sensitivity and Electrolyte Effects in CO 2 Electroreduction: From Model Studies to Applications journal June 2019
Nanostructured amalgams with tuneable silver–mercury bonding sites for selective electroreduction of carbon dioxide into formate and carbon monoxide journal January 2019
Nickel Doping in Atomically Thin Tin Disulfide Nanosheets Enables Highly Efficient CO 2 Reduction journal August 2018
Bimetallic Electrocatalysts for CO2 Reduction journal October 2018
Current achievements and the future direction of electrochemical CO 2 reduction: A short review journal June 2019
Self‐Supported Nanoporous Au 3 Cu Electrode with Enriched Gold on Surface for Efficient Electrochemical Reduction of CO 2 journal January 2020
Efficient upgrading of CO to C3 fuel using asymmetric C-C coupling active sites journal November 2019
The sensitivity of Cu for electrochemical carbon dioxide reduction to hydrocarbons as revealed by high throughput experiments journal January 2019
Atomically dispersed asymmetric Cu–B pair on 2D carbon nitride synergistically boosts the conversion of CO into C 2 products journal January 2020
Carbon monoxide electroreduction as an emerging platform for carbon utilization journal December 2019
Reduction of CO 2 to Ethanol on Cu-In/CuInS 2 Composite Thin Film Photocathode journal January 2018
Electroreduction of CO 2 on Single-Site Copper-Nitrogen-Doped Carbon Material: Selective Formation of Ethanol and Reversible Restructuration of the Metal Sites journal September 2019
Enhancing C–C bond formation by surface strain: a computational investigation for C2 and C3 intermediate formation on strained Cu surfaces journal January 2019
Hydrogen bonding steers the product selectivity of electrocatalytic CO reduction journal April 2019
High-rate electroreduction of carbon monoxide to multi-carbon products journal August 2018
Heterogeneous catalysts for catalytic CO2 conversion into value-added chemicals journal March 2019
Insight into the Formation and Transfer Process of the First Intermediate of CO 2 Reduction over Ag‐Decorated Dendritic Cu journal October 2019
Improved CO2 reduction activity towards C2+ alcohols on a tandem gold on copper electrocatalyst journal October 2018
Designing materials for electrochemical carbon dioxide recycling journal July 2019
Microfabricated electrodes unravel the role of interfaces in multicomponent copper-based CO2 reduction catalysts journal April 2018
Computational and experimental demonstrations of one-pot tandem catalysis for electrochemical carbon dioxide reduction to methane journal July 2019
Fixation of CO 2 along with bromopyridines on a silver electrode journal August 2018
Enhancing Electrocatalytic Water Splitting by Strain Engineering journal February 2019
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CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO 2 Reduction journal October 2019
Selective reduction of CO to acetaldehyde with CuAg electrocatalysts journal January 2020
Electroreduction of CO 2 on Single‐Site Copper‐Nitrogen‐Doped Carbon Material: Selective Formation of Ethanol and Reversible Restructuration of the Metal Sites journal September 2019
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Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO 2 RR) journal December 2018
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Regulating C–C coupling in thermocatalytic and electrocatalytic CO x conversion based on surface science journal January 2019
Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO 2 Reduction to Formate journal November 2019
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Microfabricated electrodes unravel the role of interfaces in multicomponent copper-based CO2 reduction catalysts text January 2018
Low-Coordinated Edge Sites on Ultrathin Palladium Nanosheets Boost Carbon Dioxide Electroreduction Performance journal July 2018

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