Effective perspiration is essential to uphold the stability of zero-gap MEA-based cathodes used in CO2 electrolysers
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F23%3A00566622" target="_blank" >RIV/61388955:_____/23:00566622 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0337941" target="_blank" >https://hdl.handle.net/11104/0337941</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d2ta06965b" target="_blank" >10.1039/d2ta06965b</a>
Alternative languages
Result language
angličtina
Original language name
Effective perspiration is essential to uphold the stability of zero-gap MEA-based cathodes used in CO2 electrolysers
Original language description
The application of gas diffusion electrodes (GDEs) for the electrochemical reduction of CO2 to value-added products creates the possibility of achieving current densities of a few hundred mA cm(-2). To achieve stable operation at such high reaction rates remains, however, a challenging task, due to the flooding of the GDE. In order to mitigate flooding in a zero-gap membrane-electrode assembly (MEA) configuration, paths for effective electrolyte perspiration inside the GDE structure have to be kept open during the electrolysis process. Here we demonstrate that apart from the operational parameters of the electrolysis and the structural properties of the supporting gas diffusion layers, also the chemical composition of the applied catalyst inks can play a decisive role in the electrolyte management of GDEs used for CO2 electroreduction. In particular, the presence of excess amounts of polymeric capping agents (used to stabilize the catalyst nanoparticles) can lead to a blockage of micropores, which hinders perspiration and initiates the flooding of the microporous layer. Here we use a novel ICP-MS analysis-based approach to quantitatively monitor the amount of perspired electrolyte that exits a GDE-based CO2 electrolyser, and we show a direct correlation between the break-down of effective perspiration and the appearance of flooding-the latter ultimately leading to a loss of electrolyser stability. We recommend the use of an ultracentrifugation-based approach by which catalyst inks containing no excess amount of polymeric capping agents can be formulated. Using these inks, the stability of electrolyses can be ensured for much longer times.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Materials Chemistry A
ISSN
2050-7488
e-ISSN
2050-7496
Volume of the periodical
11
Issue of the periodical within the volume
10
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
5083-5094
UT code for WoS article
000897869500001
EID of the result in the Scopus database
2-s2.0-85144757062