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Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts
In this work, we employ differential electrochemical mass spectrometry (DEMS) to track the real-time evolution of CO at nanoporous gold (NpAu) catalysts with varying pore parameters (diameter and length) during the electrochemical CO(2) reduction reaction (CO(2)RR). We show that due to the increase...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8926346/ https://www.ncbi.nlm.nih.gov/pubmed/35414878 http://dx.doi.org/10.1039/d1sc05743j |
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author | Goyal, Akansha Bondue, Christoph J. Graf, Matthias Koper, Marc T. M. |
author_facet | Goyal, Akansha Bondue, Christoph J. Graf, Matthias Koper, Marc T. M. |
author_sort | Goyal, Akansha |
collection | PubMed |
description | In this work, we employ differential electrochemical mass spectrometry (DEMS) to track the real-time evolution of CO at nanoporous gold (NpAu) catalysts with varying pore parameters (diameter and length) during the electrochemical CO(2) reduction reaction (CO(2)RR). We show that due to the increase in the local pH with increasing catalyst roughness, NpAu catalysts suppress the bicarbonate-mediated hydrogen evolution reaction (HER) compared to a flat Au electrode. Additionally, the geometric current density for CO(2)RR increases with the roughness of NpAu catalysts, which we attribute to the increased availability of active sites at NpAu catalysts. Together, the enhancement of CO(2)RR and the suppression of competing HER results in a drastic increase in the faradaic selectivity for CO(2)RR with increasing pore length and decreasing pore diameter, reaching near 100% faradaic efficiency for CO in the most extreme case. Interestingly, unlike the geometric current density, the specific current density for CO(2)RR has a more complicated relation with the roughness of the NpAu catalysts. We show that this is due to the presence of ohmic drop effects along the length of the porous channels. These ohmic drop effects render the pores partially electrocatalytically inactive and hence, they play an important role in tuning the CO(2)RR activity on nanoporous catalysts. |
format | Online Article Text |
id | pubmed-8926346 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-89263462022-04-11 Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts Goyal, Akansha Bondue, Christoph J. Graf, Matthias Koper, Marc T. M. Chem Sci Chemistry In this work, we employ differential electrochemical mass spectrometry (DEMS) to track the real-time evolution of CO at nanoporous gold (NpAu) catalysts with varying pore parameters (diameter and length) during the electrochemical CO(2) reduction reaction (CO(2)RR). We show that due to the increase in the local pH with increasing catalyst roughness, NpAu catalysts suppress the bicarbonate-mediated hydrogen evolution reaction (HER) compared to a flat Au electrode. Additionally, the geometric current density for CO(2)RR increases with the roughness of NpAu catalysts, which we attribute to the increased availability of active sites at NpAu catalysts. Together, the enhancement of CO(2)RR and the suppression of competing HER results in a drastic increase in the faradaic selectivity for CO(2)RR with increasing pore length and decreasing pore diameter, reaching near 100% faradaic efficiency for CO in the most extreme case. Interestingly, unlike the geometric current density, the specific current density for CO(2)RR has a more complicated relation with the roughness of the NpAu catalysts. We show that this is due to the presence of ohmic drop effects along the length of the porous channels. These ohmic drop effects render the pores partially electrocatalytically inactive and hence, they play an important role in tuning the CO(2)RR activity on nanoporous catalysts. The Royal Society of Chemistry 2022-02-22 /pmc/articles/PMC8926346/ /pubmed/35414878 http://dx.doi.org/10.1039/d1sc05743j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Goyal, Akansha Bondue, Christoph J. Graf, Matthias Koper, Marc T. M. Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts |
title | Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts |
title_full | Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts |
title_fullStr | Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts |
title_full_unstemmed | Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts |
title_short | Effect of pore diameter and length on electrochemical CO(2) reduction reaction at nanoporous gold catalysts |
title_sort | effect of pore diameter and length on electrochemical co(2) reduction reaction at nanoporous gold catalysts |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8926346/ https://www.ncbi.nlm.nih.gov/pubmed/35414878 http://dx.doi.org/10.1039/d1sc05743j |
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