Skorikova, G. Rauber, D. Aili, D. Martin, S. Li, Q. Henkensmeier, D. Hempelmann, R. 2024-01-19T17:01:42Z 2024-01-19T17:01:42Z 2021-09-05 2020-08 0376-7388 https://pubs.kist.re.kr/handle/201004/118292 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 degrees 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 degrees 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 degrees 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 degrees C and anhydrous conditions. English ELSEVIER Protic ionic liquids immobilized in phosphoric acid -doped polybenzimidazole matrix enable polymer electrolyte fuel cell operation at 200 degrees C Article 10.1016/j.memsci.2020.118188 1 JOURNAL OF MEMBRANE SCIENCE, v.608 JOURNAL OF MEMBRANE SCIENCE 608 N scie scopus 000539295800007 2-s2.0-85087983084 Engineering, Chemical Polymer Science Engineering Polymer Science Article COMPOSITE MEMBRANES PHYSICOCHEMICAL PROPERTIES TEMPERATURE PERFORMANCE DURABILITY CONDUCTIVITY AGGREGATION REDUCTION Polybenzimidazole Protic ionic liquid High temperature fuel cells Immobilization Polymer composite membrane