New highly phosphonated polysulfone membranes for PEM fuel cells

Abu-Thabit, Nedal Y., Ali, Shaikh A. and Zaidi, S. M. Javaid (2010) New highly phosphonated polysulfone membranes for PEM fuel cells. Journal of Membrane Science, 360 1-2: 26-33. doi:10.1016/j.memsci.2010.04.041

Author Abu-Thabit, Nedal Y.
Ali, Shaikh A.
Zaidi, S. M. Javaid
Title New highly phosphonated polysulfone membranes for PEM fuel cells
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2010-09
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.memsci.2010.04.041
Open Access Status
Volume 360
Issue 1-2
Start page 26
End page 33
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2010
Language eng
Formatted abstract
 This paper reports the development and characterization of phosphonated poly(arylene ether sulfone) polymer electrolytes for direct methanol fuel cells. The synthesis of phosphonated polysulfone was performed by a post-phosphonation method via chloromethylation of the polysulfone backbone followed by phosphonation utilizing the Michaels–Arbuzov reaction. High degree of phosphonation up to 150% was achieved without crosslinking side reactions. The obtained membranes/polymers in the ester form were hydrolyzed to the corresponding phosphonic acid by refluxing in aqueous hydrochloric acid. The modified polymers were characterized by nuclear magnetic resonance, infrared spectroscopy, ion exchange capacity, differential scanning calorimetry and thermal gravity analysis. The high level of phosphonic acid content 150% led to high water uptake level 52 wt% which is necessary to reach high proton conductivity values. The synthesized membranes with the highest phosphonic acid content 150% reached 12 mS/cm at 100 °C under fully hydrated conditions and showed low methanol crossover (9.12 × 10−8 cm2/s) compared to Nafion 117 membranes. Also, membranes with 150% phosphonic acid content exhibit high thermal stability up to 252 °C under air which entitle them as future candidates for proton exchange membrane fuel cells PEMFCs.
Keyword Phosphonated polysulfone
Ion exchange membrane
Water uptake
Proton conducting electrolyte
Methanol permeability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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