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Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction

[Image: see text] The activity and selectivity of a copper electrocatalyst during the electrochemical CO(2) reduction reaction (eCO(2)RR) are largely dominated by the interplay between local reaction environment, the catalyst surface, and the adsorbed intermediates. In situ characterization studies...

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Autores principales: An, Hongyu, de Ruiter, Jim, Wu, Longfei, Yang, Shuang, Meirer, Florian, van der Stam, Ward, Weckhuysen, Bert M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10369669/
https://www.ncbi.nlm.nih.gov/pubmed/37502158
http://dx.doi.org/10.1021/jacsau.3c00129
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author An, Hongyu
de Ruiter, Jim
Wu, Longfei
Yang, Shuang
Meirer, Florian
van der Stam, Ward
Weckhuysen, Bert M.
author_facet An, Hongyu
de Ruiter, Jim
Wu, Longfei
Yang, Shuang
Meirer, Florian
van der Stam, Ward
Weckhuysen, Bert M.
author_sort An, Hongyu
collection PubMed
description [Image: see text] The activity and selectivity of a copper electrocatalyst during the electrochemical CO(2) reduction reaction (eCO(2)RR) are largely dominated by the interplay between local reaction environment, the catalyst surface, and the adsorbed intermediates. In situ characterization studies have revealed many aspects of this intimate relationship between surface reactivity and adsorbed species, but these investigations are often limited by the spatial and temporal resolution of the analytical technique of choice. Here, Raman spectroscopy with both space and time resolution was used to reveal the distribution of adsorbed species and potential reaction intermediates on a copper electrode during eCO(2)RR. Principal component analysis (PCA) of the in situ Raman spectra revealed that a working electrocatalyst exhibits spatial heterogeneities in adsorbed species, and that the electrode surface can be divided into CO-dominant (mainly located at dendrite structures) and C–C dominant regions (mainly located at the roughened electrode surface). Our spectral evaluation further showed that in the CO-dominant regions, linear CO was observed (as characterized by a band at ∼2090 cm(–1)), accompanied by the more classical Cu–CO bending and stretching vibrations located at ∼280 and ∼360 cm(–1), respectively. In contrast, in the C–C directing region, these three Raman bands are suppressed, while at the same time a band at ∼495 cm(–1) and a broad Cu–CO band at ∼2050 cm(–1) dominate the Raman spectra. Furthermore, PCA revealed that anodization creates more C–C dominant regions, and labeling experiments confirmed that the 495 cm(–1) band originates from the presence of a Cu–C intermediate. These results indicate that a copper electrode at work is very dynamic, thereby clearly displaying spatiotemporal heterogeneities, and that in situ micro-spectroscopic techniques are crucial for understanding the eCO(2)RR mechanism of working electrocatalyst materials.
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spelling pubmed-103696692023-07-27 Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction An, Hongyu de Ruiter, Jim Wu, Longfei Yang, Shuang Meirer, Florian van der Stam, Ward Weckhuysen, Bert M. JACS Au [Image: see text] The activity and selectivity of a copper electrocatalyst during the electrochemical CO(2) reduction reaction (eCO(2)RR) are largely dominated by the interplay between local reaction environment, the catalyst surface, and the adsorbed intermediates. In situ characterization studies have revealed many aspects of this intimate relationship between surface reactivity and adsorbed species, but these investigations are often limited by the spatial and temporal resolution of the analytical technique of choice. Here, Raman spectroscopy with both space and time resolution was used to reveal the distribution of adsorbed species and potential reaction intermediates on a copper electrode during eCO(2)RR. Principal component analysis (PCA) of the in situ Raman spectra revealed that a working electrocatalyst exhibits spatial heterogeneities in adsorbed species, and that the electrode surface can be divided into CO-dominant (mainly located at dendrite structures) and C–C dominant regions (mainly located at the roughened electrode surface). Our spectral evaluation further showed that in the CO-dominant regions, linear CO was observed (as characterized by a band at ∼2090 cm(–1)), accompanied by the more classical Cu–CO bending and stretching vibrations located at ∼280 and ∼360 cm(–1), respectively. In contrast, in the C–C directing region, these three Raman bands are suppressed, while at the same time a band at ∼495 cm(–1) and a broad Cu–CO band at ∼2050 cm(–1) dominate the Raman spectra. Furthermore, PCA revealed that anodization creates more C–C dominant regions, and labeling experiments confirmed that the 495 cm(–1) band originates from the presence of a Cu–C intermediate. These results indicate that a copper electrode at work is very dynamic, thereby clearly displaying spatiotemporal heterogeneities, and that in situ micro-spectroscopic techniques are crucial for understanding the eCO(2)RR mechanism of working electrocatalyst materials. American Chemical Society 2023-07-06 /pmc/articles/PMC10369669/ /pubmed/37502158 http://dx.doi.org/10.1021/jacsau.3c00129 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle An, Hongyu
de Ruiter, Jim
Wu, Longfei
Yang, Shuang
Meirer, Florian
van der Stam, Ward
Weckhuysen, Bert M.
Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction
title Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction
title_full Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction
title_fullStr Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction
title_full_unstemmed Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction
title_short Spatiotemporal Mapping of Local Heterogeneities during Electrochemical Carbon Dioxide Reduction
title_sort spatiotemporal mapping of local heterogeneities during electrochemical carbon dioxide reduction
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10369669/
https://www.ncbi.nlm.nih.gov/pubmed/37502158
http://dx.doi.org/10.1021/jacsau.3c00129
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