2006
DOI: 10.1016/j.elecom.2006.06.018
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Blend membranes based on sulfonated poly(ether ether ketone) and polysulfone bearing benzimidazole side groups for proton exchange membrane fuel cells

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Cited by 114 publications
(65 citation statements)
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“…While the proton conductivity of SPEEK decreases with increasing temperature as the proton conduction becomes difficult at high temperatures in such acid-based polymers, the conductivity of the SPEEK/PSf-ABIm blend membranes increase with increasing temperature due to the presence of pendant 2-amino-benzimidazole tethered onto polysulfone. Compared to the pendant benzimidazole groups [16], the pendant 2-amino-benzimidazole groups could act as a better 'bridge' to promote proton conduction between sulfonic acid groups under low relative humidity conditions. Also, the proton conductivity increases as the content of PSf-ABIm increases, confirming the role played by 2-amino-benzimidazole on proton conduction.…”
Section: Resultsmentioning
confidence: 99%
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“…While the proton conductivity of SPEEK decreases with increasing temperature as the proton conduction becomes difficult at high temperatures in such acid-based polymers, the conductivity of the SPEEK/PSf-ABIm blend membranes increase with increasing temperature due to the presence of pendant 2-amino-benzimidazole tethered onto polysulfone. Compared to the pendant benzimidazole groups [16], the pendant 2-amino-benzimidazole groups could act as a better 'bridge' to promote proton conduction between sulfonic acid groups under low relative humidity conditions. Also, the proton conductivity increases as the content of PSf-ABIm increases, confirming the role played by 2-amino-benzimidazole on proton conduction.…”
Section: Resultsmentioning
confidence: 99%
“…Tethering of N-heterocycles to a polymer backbone followed by its blending with a sulfonic acid polymer is an attractive strategy to achieve high proton conduction through acid-base interactions involving the sulfonic acid groups in one polymer (acidic polymer) and the basic Ncontaining groups in the other polymer (basic polymer) [14][15][16][17]. However, this strategy has been pursued with basic polymers having only one or two nitrogen atoms acting as proton donors or acceptors (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…The pendant benzimidazole groups may insert into the hydrophilic domains via the acid-base interaction in the SPEEK membranes and promote proton transfer via Grotthuss-type mechanism, reducing the dependence on water. The investigation indicates that this basic polymer provides a promising pathway for developing new alternative membranes that can be used at higher temperatures with low relative humidity [42]. It is well known that the performance of Nafion greatly depends on the perfluorinated structure [43].…”
Section: Speek-based Acid-base Membranesmentioning
confidence: 99%
“…27,28 Recently, we reported that polysulfone bearing benzimidazole ͑PSf-BIm͒ or amino-benzimidazole ͑PSf-ABIm͒ side groups could promote proton conduction in SPEEK under anhydrous conditions through acid-base interaction between the sulfonic acid groups of the SPEEK and the nitrogen atoms of the benzimidazole groups tethered to similar aromatic backbones. 29,30 This blend membrane concept is based on industrially available, inexpensive polymer precursors that are compatible with each other due to similar aromatic backbones. In addition to SPEEK being known to exhibit lower methanol crossover compared to Nafion, the benzimidazole side groups tethered to the PSf backbone could also help to suppress methanol crossover further by inserting into the hydrophilic channels.…”
mentioning
confidence: 99%