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Cracks as Efficient Tools to Mitigate Flooding in Gas Diffusion Electrodes Used for the Electrochemical Reduction of Carbon Dioxide
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SYSNO ASEP 0559112 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Cracks as Efficient Tools to Mitigate Flooding in Gas Diffusion Electrodes Used for the Electrochemical Reduction of Carbon Dioxide Author(s) Kong, Y. (CH)
Liu, M. (CH)
Hu, H. (CH)
Hou, Y. (CH)
Vesztergom, S. (HU)
Gálvez-Vázquez, M. de J. (CH)
Zelocualtecatl Montiel, I. (CH)
Kolivoška, Viliam (UFCH-W) RID, ORCID
Broekmann, P. (CH)Article number 2200369 Source Title Small Methods. - : Wiley - ISSN 2366-9608
Roč. 6, č. 6 (2022)Number of pages 16 s. Language eng - English Country DE - Germany Keywords carbon dioxide electroreduction ; cracks ; flooding ; gas diffusion electrodes ; microporous layers ; perspiration ; precipitation Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA18-09848S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFCH-W - RVO:61388955 UT WOS 000822533700001 EID SCOPUS 85133615385 DOI 10.1002/smtd.202200369 Annotation The advantage of employing gas diffusion electrodes (GDEs) in carbon dioxide reduction electrolyzers is that they allow CO2 to reach the catalyst in gaseous state, enabling current densities that are orders of magnitude larger than what is achievable in standard H-type cells. The gain in the reaction rate comes, however, at the cost of stability issues related to flooding that occurs when excess electrolyte permeates the micropores of the GDE, effectively blocking the access of CO2 to the catalyst. For electrolyzers operated with alkaline electrolytes, flooding leaves clear traces within the GDE in the form of precipitated potassium (hydrogen)carbonates. By analyzing the amount and distribution of precipitates, and by quantifying potassium salts transported through the GDE during operation (electrolyte perspiration), important information can be gained with regard to the extent and means of flooding. In this work, a novel combination of energy dispersive X-ray and inductively coupled plasma mass spectrometry based methods is employed to study flooding-related phenomena in GDEs differing in the abundance of cracks in the microporous layer. It is concluded that cracks play an important role in the electrolyte management of CO2 electrolyzers, and that electrolyte perspiration through cracks is paramount in avoiding flooding-related performance drops. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0332534
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