Polybenzimidazoles (PBIs) are among the polymers of choice to prepare membranes for high temperature polymer fuel cells. Poly-2,2′(2,6-pyridine) -5,5′-bibenzimidazole (PBI5N), doped with H3PO4, and acid-doped PBI5N containing 10 wt% of imidazole-functionalized silica membranes were studied with thermogravimetric analysis, differential scanning calorimetry, dynamic-mechanical analysis, infrared spectroscopy, and broadband electric spectroscopy to examine the structure-property relationships. Key results show that: (1) doped PBI5N membranes show thermal decomposition starting at 120 °C, while pristine PBI5N is stable up to 300 °C; (2) the presence of filler increases the acid uptake and decreases the crystallinity of PBI5N; (3) the addition of phosphoric acid reduces the mechanical properties of the membrane, while the addition of filler has the opposite effect; (4) acid-doped membranes have conductivity values on the order of 10 -2-10-3 S cm-1; and (5) membranes exhibit a Vogel-Tamman-Fulcher (VTF) type proton conduction mechanism, where proton hopping is coupled with the segmental motion of the polymer chain. Infrared spectroscopy combined with DFT quantum mechanical calculations was used to assign the experimental spectrum of PBI5N

Di Noto, V., Piga, M., Giffin, G., Quartarone, E., Righetti, P., Mustarelli, P., et al. (2011). Structure-Property Interplay of Proton Conducting Membranes Based on Poly-2,2-(2,6-pyridine)-5,5-bibenzimidazole, SiO2-Im and H3PO4 for High Temperature Fuel Cells. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 13(26), 12146-12154 [10.1039/c1cp20902g].

Structure-Property Interplay of Proton Conducting Membranes Based on Poly-2,2-(2,6-pyridine)-5,5-bibenzimidazole, SiO2-Im and H3PO4 for High Temperature Fuel Cells

Mustarelli, P;
2011

Abstract

Polybenzimidazoles (PBIs) are among the polymers of choice to prepare membranes for high temperature polymer fuel cells. Poly-2,2′(2,6-pyridine) -5,5′-bibenzimidazole (PBI5N), doped with H3PO4, and acid-doped PBI5N containing 10 wt% of imidazole-functionalized silica membranes were studied with thermogravimetric analysis, differential scanning calorimetry, dynamic-mechanical analysis, infrared spectroscopy, and broadband electric spectroscopy to examine the structure-property relationships. Key results show that: (1) doped PBI5N membranes show thermal decomposition starting at 120 °C, while pristine PBI5N is stable up to 300 °C; (2) the presence of filler increases the acid uptake and decreases the crystallinity of PBI5N; (3) the addition of phosphoric acid reduces the mechanical properties of the membrane, while the addition of filler has the opposite effect; (4) acid-doped membranes have conductivity values on the order of 10 -2-10-3 S cm-1; and (5) membranes exhibit a Vogel-Tamman-Fulcher (VTF) type proton conduction mechanism, where proton hopping is coupled with the segmental motion of the polymer chain. Infrared spectroscopy combined with DFT quantum mechanical calculations was used to assign the experimental spectrum of PBI5N
Articolo in rivista - Articolo scientifico
Fuel cells, PBI
English
2011
13
26
12146
12154
none
Di Noto, V., Piga, M., Giffin, G., Quartarone, E., Righetti, P., Mustarelli, P., et al. (2011). Structure-Property Interplay of Proton Conducting Membranes Based on Poly-2,2-(2,6-pyridine)-5,5-bibenzimidazole, SiO2-Im and H3PO4 for High Temperature Fuel Cells. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 13(26), 12146-12154 [10.1039/c1cp20902g].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/256973
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