2012
DOI: 10.1007/s10965-012-9875-8
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Polybenzimidazole/poly(tetrafluoro ethylene) composite membranes for high temperature proton exchange membrane fuel cells

Abstract: A porous poly(tetrafluoro ethylene) (PTFE) thin film (thickness 16±2 μm) is used as a supporting material for polybenzimidazole (PBI) to prepare the PBI/PTFE composite membrane (thickness 38±2 μm). The perfluorosulfonic acid resin (Nafion) is used as a coupling agent at the interface between PTFE and PBI to improve the bonding between PBI and PTFE. The composite membrane, after doping with phosphoric acid, is used to prepare membrane electrode assemblies (MEAs). A 450 h continuous fuel cell life test at 160°C … Show more

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Cited by 13 publications
(3 citation statements)
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“…Because of the low chemical compatibility of PTFE and PBI, it is mandatory to perform proper pre-treatments in order to activate PTFE, thereby obtaining good interfacial properties between PTFE and PBI. Two different methods were reported in the literature: chemical activation [ 66 ] and coupling agent pre-treatment [ 67 ]. In chemical activation, the surface of the PTFE films must be activated by immersion in H 2 SO 4 /H 2 O 2 solutions, followed by immersion in basic NaOH, and then in DMAc.…”
Section: Pbi Composite Membranesmentioning
confidence: 99%
“…Because of the low chemical compatibility of PTFE and PBI, it is mandatory to perform proper pre-treatments in order to activate PTFE, thereby obtaining good interfacial properties between PTFE and PBI. Two different methods were reported in the literature: chemical activation [ 66 ] and coupling agent pre-treatment [ 67 ]. In chemical activation, the surface of the PTFE films must be activated by immersion in H 2 SO 4 /H 2 O 2 solutions, followed by immersion in basic NaOH, and then in DMAc.…”
Section: Pbi Composite Membranesmentioning
confidence: 99%
“…The porous PTFE reinforcement technique is an effective method for increasing the mechanical strength of membranes. 26,27 Reinforced composite membranes exhibit better mechanical properties and dimensional stability. 28,29 Nevertheless, the low surface energy and chemical inertness of PTFE, inhibit the combination of PTFE and non-uorinated main-chain polymer, which are detrimental to the properties of composite membranes because the performance of the lm strongly depends on the combination of the polymer and porous PTFE substrate.…”
Section: Introductionmentioning
confidence: 99%
“…(2) Alternative sulfonated polymers and composite membranes, such as polybenzimidazole (PBI). Lin et al [4] show a high performance PBI/PTFE composite PEM which can be prepared using the perfluorosulfonic acid resin as a coupling agent. The results suggest the PBI/PTFE composite membrane is one of the excellent PEM candidates for HT-PEMFC.…”
Section: Introductionmentioning
confidence: 99%