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Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring

[Image: see text] A fast response microsensor that can detect the distribution of CO(2) at the microscale level is essential for the observation of biophysiological activity, carbon flux, and carbon burial. Inspired by the previous success of Cu catalysis, we attempted to use this metal Cu material...

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Autores principales: Guo, Mengwen, Xun, Yao, Kang, Fuxing, Revsbech, Niels Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10688157/
https://www.ncbi.nlm.nih.gov/pubmed/38046328
http://dx.doi.org/10.1021/acsomega.3c06480
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author Guo, Mengwen
Xun, Yao
Kang, Fuxing
Revsbech, Niels Peter
author_facet Guo, Mengwen
Xun, Yao
Kang, Fuxing
Revsbech, Niels Peter
author_sort Guo, Mengwen
collection PubMed
description [Image: see text] A fast response microsensor that can detect the distribution of CO(2) at the microscale level is essential for the observation of biophysiological activity, carbon flux, and carbon burial. Inspired by the previous success of Cu catalysis, we attempted to use this metal Cu material to develop an amperometric microsensor that can meet the requirements. Specifically, the ambient gases diffuse through a silicone membrane into a trap casing filled with an acidic CrCl(2) solution, where the otherwise interfering O(2) interferent is removed by a redox with Cr(2+). The gases then diffuse through a second silicone membrane into an electrolyte, where CO(2) is selectively reduced to methanol (CH(3)OH) at a Cu cathode through a carbon monoxide (CO) pathway. Due to the use of Cu catalysis at the WE tip, CO(2) can be reduced at a less negative polarization (−470 mV) instead of the previously reported −1200 mV, thus avoiding hydrogen-evolution interference due to water from the byproduct or from water diffusion through the silicone membrane. This moderate polarization results in a stable baseline, making the microsensor suitable for long-term monitoring. Interferences from other gases, such as N(2)O, which may be of much concern in environmental monitoring, can be ignored. Applications and limitations are also discussed with a view to further improvement in the future.
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spelling pubmed-106881572023-12-01 Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring Guo, Mengwen Xun, Yao Kang, Fuxing Revsbech, Niels Peter ACS Omega [Image: see text] A fast response microsensor that can detect the distribution of CO(2) at the microscale level is essential for the observation of biophysiological activity, carbon flux, and carbon burial. Inspired by the previous success of Cu catalysis, we attempted to use this metal Cu material to develop an amperometric microsensor that can meet the requirements. Specifically, the ambient gases diffuse through a silicone membrane into a trap casing filled with an acidic CrCl(2) solution, where the otherwise interfering O(2) interferent is removed by a redox with Cr(2+). The gases then diffuse through a second silicone membrane into an electrolyte, where CO(2) is selectively reduced to methanol (CH(3)OH) at a Cu cathode through a carbon monoxide (CO) pathway. Due to the use of Cu catalysis at the WE tip, CO(2) can be reduced at a less negative polarization (−470 mV) instead of the previously reported −1200 mV, thus avoiding hydrogen-evolution interference due to water from the byproduct or from water diffusion through the silicone membrane. This moderate polarization results in a stable baseline, making the microsensor suitable for long-term monitoring. Interferences from other gases, such as N(2)O, which may be of much concern in environmental monitoring, can be ignored. Applications and limitations are also discussed with a view to further improvement in the future. American Chemical Society 2023-11-13 /pmc/articles/PMC10688157/ /pubmed/38046328 http://dx.doi.org/10.1021/acsomega.3c06480 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 Guo, Mengwen
Xun, Yao
Kang, Fuxing
Revsbech, Niels Peter
Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring
title Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring
title_full Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring
title_fullStr Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring
title_full_unstemmed Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring
title_short Copper Catalysis-Based Amperometric Microsensors for Carbon Dioxide Monitoring
title_sort copper catalysis-based amperometric microsensors for carbon dioxide monitoring
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10688157/
https://www.ncbi.nlm.nih.gov/pubmed/38046328
http://dx.doi.org/10.1021/acsomega.3c06480
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