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Pyridine-based PBI Composite Membranes for PEMFCs

✍ Scribed by E. Quartarone; A. Magistris; P. Mustarelli; S. Grandi; A. Carollo; G.Z. Zukowska; J. E. Garbarczyk; J. L. Nowinski; C. Gerbaldi; S. Bodoardo

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
330 KB
Volume
9
Category
Article
ISSN
1615-6846

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✦ Synopsis

Abstract

Polybenzimidazole (PBI) activated with H~3~PO~4~ is one of the membranes of choice to replace Nafion® in PEMFCs in order to allow their use above 100 °C. The limits of PBI in terms of acid leaching and low conductivity below 160 °C can be overcome by a proper monomer tailoring, and by the addition of new fillers. Here, we report on new pyridine‐based PBI membranes with: (i) imidazole‐silica (SiO~2~‐Im) and (ii) mesostructured silica (SBA‐15) fillers. Both the thermal stability and the permanent conductivity are improved by adding 5 wt.‐% of filler, but SiO~2~‐Im gives the best results. Permanent conductivity values higher than 10^–3^ S cm^–1^ are obtained at 120 °C and 50% R.H. Vibrational spectroscopies (FT‐IR and Raman) are used to investigate the relationships among the polymer, the filler and the activating H~3~PO~4~ acid.

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