Homogeneity analysis of square meter-sized electrodes for PEM electrolysis and PEM fuel cells / Andrea Burdzik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1423-1432 Titre : Homogeneity analysis of square meter-sized electrodes for PEM electrolysis and PEM fuel cells Type de document : texte imprimé Auteurs : Andrea Burdzik, Auteur ; Markus Stähler, Auteur ; Irene Friedrich ; Marcelo Carmo ; Detlef Stolten Année de publication : 2018 Article en page(s) : p. 1423-1432 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Electrolyse Enduction par filière Membranes (technologie) Piles à combustible Poids Polyélectrolytes Revêtements Supports de catalyseurs Index. décimale : 667.9 Revêtements et enduits Résumé : Electrodes for polymer electrolyte membrane electrolyzers and fuel cells are manufactured by coating a catalyst dispersion, consisting of precious metal, ionomer and solvents, onto a substrate that is subsequently dried. One target of current research is to produce square meter-sized electrodes, but so far the homogeneity that can be achieved in this scaling is unclear. To quantify the achievable homogeneity of an electrode, manufactured by means of slot die coating in a roll-to-roll pilot plant, this study focuses first on the selection of an appropriate substrate by investigating thickness, basis weight and surface free energy distribution at the square meter scale. Afterward, a dispersion is coated on the selected substrate, dried and investigated with respect to thickness and basis weight distribution. Among the investigated substrates, Kapton has the smallest scatter in terms of thickness and basis weight. The subsequent coating results in a precious metal loading of 1.10 mg cm−2, with a scattering of 5.5% that can be further reduced to 4.5% when edge effects can be prevented. These results are now available for further research in which it is necessary to investigate whether or not these fluctuations affect the achievable electrochemical efficiencies of electrodes. Note de contenu : - EXPERIMENTAL : Thickness and basis weight distribution - Surface free energy distribution - Substrate coating - Catalyst basis weight distribution - RESULTS AND DISCUSSION : Catalyst dispersion analysis - Laboratory-scale coating - Thickness and basis weight distribution of decal substrates - SFE distribution of decal substrate - Thickness and basis weight distribution of the coated substrate DOI : 10.1007/s11998-018-0074-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0074-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31363 [article]

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Steering and in situ monitoring of drying phenomena during film fabrication / Fabien Scheepers in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1213-1221 Titre : Steering and in situ monitoring of drying phenomena during film fabrication Type de document : texte imprimé Auteurs : Fabien Scheepers, Auteur ; Andrea Stähler, Auteur ; Markus Stähler, Auteur ; Marcelo Carmo, Auteur ; Werner Lehnert, Auteur ; Detlef Stolten, Auteur Année de publication : 2019 Article en page(s) : p. 1213-1221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de verre Electrodes Enduction par filière Polytétrafluoréthylène Revêtements -- Défauts Revêtements -- Fissuration Revêtements organiques Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : During film fabrication, the phenomena of crack formation and delamination are often observed, dramatically hindering the discovery and characterization of new materials for energy applications. In this work, we report on a novel approach to fully steer the drying parameters or “knobs” that are commonly used during electrode manufacture. It allows us to precisely in situ control and monitor the solvent-specific evaporation rates that affect the development of suspension composition during drying. We managed to control the capillary stress inside the layer by precisely controlling the selectivity of solvent evaporation. Large cracks result when the surface tension increases over time and layer delamination occurs. When using an n-propanol/water system, critical crack formation is achieved when water is enriched by decreasing the gas exchange during drying or preloading the gas phase with water vapor. High gas exchange rates inhibit the water’s enrichment, and therefore, only small surface cracks develop. The experiments also surprisingly indicate that the drying temperature has no significant effect on crack formation. These results are of fundamental meaning for the future development of electrodes as the drying step has a high impact on the products specification and now can be ultimately controlled. The future development of electrodes will surely benefit from this achievement in the controlled fabrication of films for a variety of applications. Note de contenu : - EXPERIMENTAL : Principle - Slot die coating - Drying test station - RESULTS AND DISCUSSION : Variation in suspension composition/concentration - Variation in drying parameters DOI : 10.1007/s11998-019-00206-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00206-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33004 [article]

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