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Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media

Operando laboratory X-ray radiographies were carried out for imaging of two different silver-based gas diffusion electrodes containing an electroconductive Ni mesh structure, one gas diffusion electrode composed of 95 wt.% Ag and 5 wt.% polytetrafluoroethylene and one composed of 97 wt.% Ag and 3 wt...

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Autores principales: Paulisch, Melanie Cornelia, Gebhard, Marcus, Franzen, David, Hilger, André, Osenberg, Markus, Kardjilov, Nikolay, Ellendorff, Barbara, Turek, Thomas, Roth, Christina, Manke, Ingo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6747613/
https://www.ncbi.nlm.nih.gov/pubmed/31443453
http://dx.doi.org/10.3390/ma12172686
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author Paulisch, Melanie Cornelia
Gebhard, Marcus
Franzen, David
Hilger, André
Osenberg, Markus
Kardjilov, Nikolay
Ellendorff, Barbara
Turek, Thomas
Roth, Christina
Manke, Ingo
author_facet Paulisch, Melanie Cornelia
Gebhard, Marcus
Franzen, David
Hilger, André
Osenberg, Markus
Kardjilov, Nikolay
Ellendorff, Barbara
Turek, Thomas
Roth, Christina
Manke, Ingo
author_sort Paulisch, Melanie Cornelia
collection PubMed
description Operando laboratory X-ray radiographies were carried out for imaging of two different silver-based gas diffusion electrodes containing an electroconductive Ni mesh structure, one gas diffusion electrode composed of 95 wt.% Ag and 5 wt.% polytetrafluoroethylene and one composed of 97 wt.% Ag and 3 wt.% polytetrafluoroethylene, under different operating parameters. Thereby, correlations of their electrochemical behavior and the transport of the 30 wt.% NaOH electrolyte through the gas diffusion electrodes were revealed. The work was divided into two parts. In the first step, the microstructure of the gas diffusion electrodes was analyzed ex situ by a combination of focused ion beam technology and synchrotron as well as laboratory X-ray tomography and radiography. In the second step, operando laboratory X-ray radiographies were performed during chronoamperometric measurements at different potentials. The combination of the ex situ microstructural analyses and the operando measurements reveals the impact of the microstructure on the electrolyte transport through the gas diffusion electrodes. Hence, an impact of the Ni mesh structure within the gas diffusion electrode on the droplet formation could be shown. Moreover, it could be observed that increasing overpotentials cause increasing electrolyte transport velocities and faster droplet formation due to electrowetting. In general, higher electrolyte transport velocities were found for the gas diffusion electrode with 97 wt.% Ag in contrast to that with 95 wt.% Ag.
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spelling pubmed-67476132019-09-27 Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media Paulisch, Melanie Cornelia Gebhard, Marcus Franzen, David Hilger, André Osenberg, Markus Kardjilov, Nikolay Ellendorff, Barbara Turek, Thomas Roth, Christina Manke, Ingo Materials (Basel) Article Operando laboratory X-ray radiographies were carried out for imaging of two different silver-based gas diffusion electrodes containing an electroconductive Ni mesh structure, one gas diffusion electrode composed of 95 wt.% Ag and 5 wt.% polytetrafluoroethylene and one composed of 97 wt.% Ag and 3 wt.% polytetrafluoroethylene, under different operating parameters. Thereby, correlations of their electrochemical behavior and the transport of the 30 wt.% NaOH electrolyte through the gas diffusion electrodes were revealed. The work was divided into two parts. In the first step, the microstructure of the gas diffusion electrodes was analyzed ex situ by a combination of focused ion beam technology and synchrotron as well as laboratory X-ray tomography and radiography. In the second step, operando laboratory X-ray radiographies were performed during chronoamperometric measurements at different potentials. The combination of the ex situ microstructural analyses and the operando measurements reveals the impact of the microstructure on the electrolyte transport through the gas diffusion electrodes. Hence, an impact of the Ni mesh structure within the gas diffusion electrode on the droplet formation could be shown. Moreover, it could be observed that increasing overpotentials cause increasing electrolyte transport velocities and faster droplet formation due to electrowetting. In general, higher electrolyte transport velocities were found for the gas diffusion electrode with 97 wt.% Ag in contrast to that with 95 wt.% Ag. MDPI 2019-08-22 /pmc/articles/PMC6747613/ /pubmed/31443453 http://dx.doi.org/10.3390/ma12172686 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Paulisch, Melanie Cornelia
Gebhard, Marcus
Franzen, David
Hilger, André
Osenberg, Markus
Kardjilov, Nikolay
Ellendorff, Barbara
Turek, Thomas
Roth, Christina
Manke, Ingo
Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media
title Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media
title_full Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media
title_fullStr Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media
title_full_unstemmed Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media
title_short Operando Laboratory X-Ray Imaging of Silver-Based Gas Diffusion Electrodes during Oxygen Reduction Reaction in Highly Alkaline Media
title_sort operando laboratory x-ray imaging of silver-based gas diffusion electrodes during oxygen reduction reaction in highly alkaline media
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6747613/
https://www.ncbi.nlm.nih.gov/pubmed/31443453
http://dx.doi.org/10.3390/ma12172686
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