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The Potential of Zero Charge and the Electrochemical Interface Structure of Cu(111) in Alkaline Solutions
[Image: see text] Copper (Cu) is a unique electrocatalyst, which is able to efficiently oxidize CO at very low overpotentials and reduce CO(2) to valuable fuels with reasonable Faradaic efficiencies. Yet, knowledge of its electrochemical properties at the solid/liquid interface is still scarce. Here...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical
Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8016203/ https://www.ncbi.nlm.nih.gov/pubmed/33828636 http://dx.doi.org/10.1021/acs.jpcc.0c09289 |
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author | Auer, Andrea Ding, Xing Bandarenka, Aliaksandr S. Kunze-Liebhäuser, Julia |
author_facet | Auer, Andrea Ding, Xing Bandarenka, Aliaksandr S. Kunze-Liebhäuser, Julia |
author_sort | Auer, Andrea |
collection | PubMed |
description | [Image: see text] Copper (Cu) is a unique electrocatalyst, which is able to efficiently oxidize CO at very low overpotentials and reduce CO(2) to valuable fuels with reasonable Faradaic efficiencies. Yet, knowledge of its electrochemical properties at the solid/liquid interface is still scarce. Here, we present the first two-stranded correlation of the potential of zero free charge (pzfc) of Cu(111) in alkaline electrolyte at different pH values through application of nanosecond laser pulses and the corresponding interfacial structure changes by in situ electrochemical scanning tunneling microscopy imaging. The pzfc of Cu(111) at pH 13 is identified at −0.73 V(SHE) in the apparent double layer region, prior to the onset of hydroxide adsorption. It shifts by (88 ± 4) mV to more positive potentials per decreasing pH unit. At the pzfc, Cu(111) shows structural dynamics at both pH 13 and pH 11, which can be understood as the onset of surface restructuring. At higher potentials, full reconstruction and electric field dependent OH adsorption occurs, which causes a remarkable decrease in the atomic density of the first Cu layer. The expansion of the Cu–Cu distance to 0.3 nm generates a hexagonal Moiré pattern, on which the adsorbed OH forms a commensurate (1 × 2) adlayer structure with a steady state coverage of 0.5 monolayers at pH 13. Our experimental findings shed light on the true charge distribution and its interrelation with the atomic structure of the electrochemical interface of Cu. |
format | Online Article Text |
id | pubmed-8016203 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical
Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-80162032021-04-05 The Potential of Zero Charge and the Electrochemical Interface Structure of Cu(111) in Alkaline Solutions Auer, Andrea Ding, Xing Bandarenka, Aliaksandr S. Kunze-Liebhäuser, Julia J Phys Chem C Nanomater Interfaces [Image: see text] Copper (Cu) is a unique electrocatalyst, which is able to efficiently oxidize CO at very low overpotentials and reduce CO(2) to valuable fuels with reasonable Faradaic efficiencies. Yet, knowledge of its electrochemical properties at the solid/liquid interface is still scarce. Here, we present the first two-stranded correlation of the potential of zero free charge (pzfc) of Cu(111) in alkaline electrolyte at different pH values through application of nanosecond laser pulses and the corresponding interfacial structure changes by in situ electrochemical scanning tunneling microscopy imaging. The pzfc of Cu(111) at pH 13 is identified at −0.73 V(SHE) in the apparent double layer region, prior to the onset of hydroxide adsorption. It shifts by (88 ± 4) mV to more positive potentials per decreasing pH unit. At the pzfc, Cu(111) shows structural dynamics at both pH 13 and pH 11, which can be understood as the onset of surface restructuring. At higher potentials, full reconstruction and electric field dependent OH adsorption occurs, which causes a remarkable decrease in the atomic density of the first Cu layer. The expansion of the Cu–Cu distance to 0.3 nm generates a hexagonal Moiré pattern, on which the adsorbed OH forms a commensurate (1 × 2) adlayer structure with a steady state coverage of 0.5 monolayers at pH 13. Our experimental findings shed light on the true charge distribution and its interrelation with the atomic structure of the electrochemical interface of Cu. American Chemical Society 2021-03-01 2021-03-11 /pmc/articles/PMC8016203/ /pubmed/33828636 http://dx.doi.org/10.1021/acs.jpcc.0c09289 Text en © 2021 The Authors. Published by American Chemical Society This is an open access article published under an ACS AuthorChoice License (https://creativecommons.org/licenses/by/4.0/) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Auer, Andrea Ding, Xing Bandarenka, Aliaksandr S. Kunze-Liebhäuser, Julia The Potential of Zero Charge and the Electrochemical Interface Structure of Cu(111) in Alkaline Solutions |
title | The Potential of Zero Charge and the Electrochemical
Interface Structure of Cu(111) in Alkaline Solutions |
title_full | The Potential of Zero Charge and the Electrochemical
Interface Structure of Cu(111) in Alkaline Solutions |
title_fullStr | The Potential of Zero Charge and the Electrochemical
Interface Structure of Cu(111) in Alkaline Solutions |
title_full_unstemmed | The Potential of Zero Charge and the Electrochemical
Interface Structure of Cu(111) in Alkaline Solutions |
title_short | The Potential of Zero Charge and the Electrochemical
Interface Structure of Cu(111) in Alkaline Solutions |
title_sort | potential of zero charge and the electrochemical
interface structure of cu(111) in alkaline solutions |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8016203/ https://www.ncbi.nlm.nih.gov/pubmed/33828636 http://dx.doi.org/10.1021/acs.jpcc.0c09289 |
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