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Interplay between Composition, Structure, and Properties of New H3PO4‑Doped PBI4N–HfO2 Nanocomposite Membranes for High-Temperature Proton Exchange Membrane Fuel Cells
journal contribution
posted on 2015-01-13, 00:00 authored by Graeme Nawn, Giuseppe Pace, Sandra Lavina, Keti Vezzù, Enrico Negro, Federico Bertasi, Stefano Polizzi, Vito Di NotoPolybenzimidazole (PBI) has become
a popular polymer of choice
for the preparation of membranes for potential use in high-temperature
proton exchange membrane polymer fuel cells. Phosphoric acid-doped
composite membranes of poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole]
(PBI4N) impregnated with hafnium oxide nanofiller with varying content
levels (0–18 wt %) have been prepared. The structure–property
relationships of both the undoped and acid-doped composite membranes
are studied using thermogravimetric analysis, modulated differential
scanning calorimetry, dynamic mechanical analysis, wide-angle X-ray
scattering, infrared spectroscopy, and broadband electrical spectroscopy.
Results indicate that the presence of nanofiller improves the thermal
and mechanical properties of the undoped membranes and facilitates
a greater level of acid uptake. The degree of acid dissociation within
the acid-doped membranes is found to increase with increasing nanofiller
content. This results in a conductivity, at 215 °C and a nanofiller
level x ≥ 0.04, of 9.0 × 10–2 S cm–1 for [PBI4N(HfO2)x](H3PO4)y. This renders nanocomposite membranes of this type as good
candidates for use in high temperature proton exchange membrane fuel
cells (HT-PEMFCs).
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thermogravimetric analysisPBI 4Nundoped membranesNew H 3PO PBI 4N Nanocomposite MembranesPBI 4N impregnatedscanning calorimetryacid dissociationnanofiller contenttemperature proton exchange membrane fuel cellshafnium oxide nanofillerproton exchange membrane polymer fuel cellsnanocomposite membranesacid uptake
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