Publicación: Protic ionic liquids immobilized in phosphoric acid-doped polybenzimidazole matrix enable polymer electrolyte fuel cell operation at 200 °C
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2020
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info:eu-repo/semantics/openAccess
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Resumen
Protic ionic liquids (PILs) based on the anion bis(trifluoromethanesulfonyl)imide were confined in polybenzimidazole (PBI) matrices. Quasi-solidified ionic liquid membranes (QSILMs) were fabricated and examined for mechanical and thermal stability. After doping in phosphoric acid (PA), the QSILMs exhibited conductivities of 30–60 mS cm−1 at 180 °C. Fluorescence microscopy was used to investigate the structure of the composite PBI membranes. Membrane-electrode assemblies, fabricated with PA doped QSILMs, were tested in a single fuel cell and exhibited a performance increase with increasing temperature up to 200 °C. The best performance was obtained for the membrane electrode assembly containing 50 mol% of diethyl-methyl-ammonium bis(trifluoromethylsulfonyl)imide confined in the phosphoric acid doped PBI matrix with closed porosity. It reached 0.32 W cm−2 at 200 °C and 900 mA cm−2 . The catalyst layer of the gas diffusion electrode impregnated with protic ionic liquid exhibited better long-term stability than the gas diffusion electrode impregnated with phosphoric acid within 100 h of operation at 200 °C and anhydrous conditions.
Descripción
The registered version of this article, first published in “Journal of Membrane Science, vol 44", is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.memsci.2020.118188
La versión registrada de este artículo, publicado por primera vez en “Journal of Membrane Science, vol 44", está disponible en línea en el sitio web del editor: Elsevier, https://doi.org/10.1016/j.memsci.2020.118188
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Palabras clave
Polybenzimidazole, Protic ionic liquid, High temperature fuel cells, Immobilization, Polymer composite membrane
Citación
G. Skorikova, D. Rauber, D. Aili, S. Martin, Q. Li, D. Henkensmeier, R. Hempelmann, Protic ionic liquids immobilized in phosphoric acid-doped polybenzimidazole matrix enable polymer electrolyte fuel cell operation at 200 °C, Journal of Membrane Science, Volume 608, 2020, 118188, ISSN 0376-7388, https://doi.org/10.1016/j.memsci.2020.118188
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Facultades y escuelas::Facultad de Ciencias
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