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Surface Reconstruction of Polycrystalline Cu Electrodes in Aqueous KHCO_3 Electrolyte at Potentials in the Early Stages of CO_2 Reduction

Kim, Youn-Geun and Baricuatro, Jack H. and Soriaga, Manuel P. (2018) Surface Reconstruction of Polycrystalline Cu Electrodes in Aqueous KHCO_3 Electrolyte at Potentials in the Early Stages of CO_2 Reduction. Electrocatalysis, 9 (4). pp. 526-530. ISSN 1868-2529. doi:10.1007/s12678-018-0469-z.

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The reconstruction of the Cu(pc) polycrystalline surface at potentials that correspond to the early stages of CO_2 reduction in 0.1 M KHCO_3 was investigated by electrochemical scanning tunneling microscopy (ECSTM) at −0.90 V (SHE). A kinetically hindered surface reconstruction of the topmost layers of Cu(pc) into the (100) face was observed, reminiscent of the transformation previously reported at the same electrode potential in 0.1 M KOH. Evidently, the same reconstructed surface, Cu(pc)-[Cu(100)], can be generated in either 0.1 M KHCO_3 (pH 8) or 0.1 M KOH (pH 13). In addition, only minimal structural disruption was observed when the reconstructed surface was transferred from KHCO_3 to KOH electrolyte, and vice versa, provided the solution exchange was executed potentiostatically at −0.90 V. The structural convergence toward the same (100) facet regardless of pH or supporting electrolyte strongly suggests that the Cu(pc) → Cu(pc)-[Cu(100)] surface reorganization is a general phenomenon driven primarily by the rather negative potential applied on the electrode.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Kim, Youn-Geun0000-0002-5936-6520
Soriaga, Manuel P.0000-0002-0077-6226
Alternate Title:Surface Reconstruction of Polycrystalline Cu Electrodes in Aqueous KHCO3 Electrolyte at Potentials in the Early Stages of CO2 Reduction
Additional Information:© 2018 Springer Science+Business Media, LLC, part of Springer Nature. First Online: 06 April 2018. This material is based upon the work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the US Department of Energy under Award No. DE-SC0004993.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Subject Keywords:Surface reconstruction of Cu(pc) under CO2-reduction potentials; Operando electrochemical scanning tunneling microscopy; Electrochemical CO2 reduction; Cu(pc) to Cu(pc)-[Cu(100)] surface reconstruction
Issue or Number:4
Record Number:CaltechAUTHORS:20180411-084932076
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Official Citation:Kim, YG., Baricuatro, J.H. & Soriaga, M.P. Electrocatalysis (2018) 9: 526.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85742
Deposited By: Tony Diaz
Deposited On:11 Apr 2018 18:37
Last Modified:15 Nov 2021 20:31

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