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Tuning the CO-Reduction Product Distribution by Structural Modification of the Cu Electrode Surface

Kim, Y.-G. and Baricuatro, J. H. and Javier, A. and Soriaga, M. P. (2017) Tuning the CO-Reduction Product Distribution by Structural Modification of the Cu Electrode Surface. ECS Transactions, 75 (50). pp. 87-97. ISSN 1938-6737. https://resolver.caltech.edu/CaltechAUTHORS:20180914-100811230

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Abstract

The electrochemical reduction of CO_2 on copper electrodes is known to generate a wide variety of products that include low-molecular-weight hydrocarbons and oxygenates. The product distribution can be regulated to yield a single liquid fuel by the control, at the atomic level, of the structure of the electrode surface. The reaction of interest was the selective CO-to-C_2H_5OH reduction at low potential in alkaline solution. The seriatim or sequential use of electrochemical scanning tunneling microscopy and differential electrochemical mass spectrometry allowed the identification of a particular surface structure responsible for a specific product selectivity. Monolayer-limited Cu ↔ Cu_2O oxidation-reduction cycles (ORC) in 0.1 M KOH transformed the reconstructed Cu(pc)-[Cu(100)] surface to an ordered stepped surface, Cu(S)-[3(100)×(111)], or Cu(511) that led to the exclusive production of ethanol. Despite the potential cycles, Cu(111) and (110) surfaces did not produce ethanol. The Cu(111) surface retained its pristine arrangement after a potential hold at -0.9 V and subsequent ORC. Under similar potentiostatic conditions, the Cu(110) surface became Cu(110)-[Cu(100)]; ORC of the reconstructed surface ultimately formed Cu(110)-[Cu(111)].


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/07550.0087ecstDOIArticle
ORCID:
AuthorORCID
Kim, Y.-G.0000-0002-5936-6520
Javier, A.0000-0002-0306-5462
Soriaga, M. P.0000-0002-0077-6226
Additional Information:© 2017 ECS - The Electrochemical Society. 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 No. DE-SC0004993.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Issue or Number:50
Record Number:CaltechAUTHORS:20180914-100811230
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180914-100811230
Official Citation:Youn-Geun Kim, Jack Hess Baricuatro, Alnald Javier, and Manuel P. Soriaga Tuning the CO-Reduction Product Distribution by Structural Modification of the Cu Electrode Surface ECS Trans. 2017 75(50): 87-97; doi:10.1149/07550.0087ecst
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89637
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Sep 2018 21:52
Last Modified:03 Oct 2019 20:17

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