Water and phosphoric acid uptake of poly [2,5-benzimidazole] (ABPBI) membranes prepared by low and high temperature casting

Díaz, Liliana; Abuin, Graciela C.; Corti, Horacio R.

doi:10.1016/j.jpowsour.2008.11.114

Cited by 51 publications

(55 citation statements)

References 43 publications

(56 reference statements)

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“…6.35. It can be seen that the permeability of ABPBI membranes cast from MSA is much lower than that of ABPBI cast from ethanol/NaOH all over the range of temperature studied, which is consistent with the lower water content of the former [409]. It is interesting to note that the permeability data of the commercial crosslinked ABPBI membrane lies in between the permeability of both linear polymers.…”

Section: Acid Doped Abpbi Membranessupporting

confidence: 69%

“…The doping chemistry of H 3 PO 4 in ABPBI was analyzed using the Scatchard method [425] and the dissociation constants of the acid complexed to the sites L1 and L2 are K ¼ 0.48, respectively, that is, almost one order of magnitude higher than those for PBI. This result, along with that higher acid doping of ABPBI as compared with PBI for the same acid concentration of the doping solution [409,442], indicates that ABPBI could be a better proton conducting ionomer than PBI. In Table 6.8 are summarized the conductivity data reported in the literature for ABPBI membranes obtained by casting [192,194,280,419,425,[442][443][444][445][446][447], along with results for commercial crosslinked ABPBI membranes [423,446], an isomer of ABPBI [449], sulfonated ABPBI [194,419], and ABPBI composites [419,445,450].…”

Section: Acid Doped Abpbi Membranesmentioning

confidence: 71%

“…Usually the water uptake in PBI is expressed as λ w , the number of water molecules per imidazole group, and it is lower than the corresponding λ w (molecules of water per sulfonic group) for Nafion membranes [409], although when expressed as mass of water per gram of dry membrane the water uptake of PBI is much higher than that of Nafion.…”

Section: Acid Doped Pbi Membranesmentioning

confidence: 99%

“…6.11), exhibit even larger degree of doping, in the range λ a % 10-20, probably as a consequence of a more relaxed polymer structure. The free acid content, λ f , expressed as the fraction of leachable acid from the total acid in the membrane, is less than 10 % [409].…”

Section: Acid Doped Pbi Membranesmentioning

confidence: 99%

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Membranes for Direct Alcohol Fuel Cells

Corti

2013

Direct Alcohol Fuel Cells

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This chapter is devoted to summarize and discuss the main properties of ionomeric membranes used in direct alcohol PEM fuel cells. Although Nafion is the proton exchange membrane commonly used in methanol and other direct alcohol fuel cells, other proton and alkaline membranes are being investigated in order to improve the efficiency of DAFC. The goals in the development of this critical component of DAFC are: low cost, long durability, low alcohol permeability and high electrical conductivity. The last two properties can be combined in a single parameter, the membrane selectivity that accounts for the ratio between the proton and alcohol transport through the membrane. This parameter can be compared to that measured for Nafion to define a relative selectivity, which is a primary parameter to evaluate the potentiality of a ionomer material to be used in alcohol feed fuel cells.The vast catalogue of polymeric materials reviewed here included Nafion composite with inorganic and organic fillers, and non-fluorinated proton conducting membranes such as sulfonated polyimides, poly(arylene ether)s, polysulfones, poly (vinyl alcohol), polystyrenes, and acid-doped polybenzimidazoles. Anionexchange membranes are also discussed because of the facile electro-oxidation of alcohols in alkaline media and because of the minimization of alcohol crossover in alkaline direct alcohol fuel cells.The performance of different types of membranes in direct alcohol fuel cells, mainly methanol, are summarized and discussed in order to identify the most promissory ones. The lack of correlation between the relative selectivity and fuel cell performance of the membranes indicates that the architecture of the three

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Section: Acid Doped Abpbi Membranessupporting

confidence: 69%

Section: Acid Doped Abpbi Membranesmentioning

confidence: 71%

Section: Acid Doped Pbi Membranesmentioning

confidence: 99%

Section: Acid Doped Pbi Membranesmentioning

confidence: 99%

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Membranes for Direct Alcohol Fuel Cells

Corti

2013

Direct Alcohol Fuel Cells

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“…This allows for simpler water management and a higher tolerance to carbon monoxide (CO) poisoning [4,5]. Unfortunately, the PBI monomer is expensive, and the mechanical strength of the doped polymer is low [6].…”

Section: Introductionmentioning

confidence: 99%

Membrane electrode assemblies doped with H3PO4 for high temperature proton exchange membrane fuel cells

Jung

Tseng

Yeh

et al. 2012

International Journal of Hydrogen Energy

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Rigid‐Rod Polymers

Wang¹,

Jiang²,

Adams³

2011

Encyclopedia of Polymer Science and Technology

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Pursuing high strength and high modulus polymer fibers and novel electrooptical properties have motivated much research activity in rigid‐rod polymers in the past 40 years. In this review, we examine the synthesis, structures, and properties of rigid‐rod polymers with emphasis on polybenzobisoxazoles (PBO), polybenzobisthiazoles (PBZT) and polybenzimidazoles (PBI), beginning with their solution properties, especially lyotropic liquid crystallinity. High performance fibers spun from lyotropic liquid crystalline polyphosphoric acid (PPA) solution are described. The characterization of fiber properties including mechanical, thermal, electrical, and optical properties is summarized. PBO (Zylon) and PIPD (M5) fibers were successfully commercialized in high strength applications such as body armor, ropes, cables, and recreational equipment in the last 10 years, and we discuss the possible causes of rapid degradation of some PBO fibers. The concepts of molecular composites and nanocomposites provide new applications in antiballistic materials, fire protection, athletic equipment, cables, strings, ropes, cordage, sails, multilayer circuits, and catalyst supports. Recently, rigid‐rod polymer films have drawn attention in the electrooptical fields, especially for phosphoric acid (PA)‐doped PBI membranes (Celtec MEAs) in the applications of high temperature fuel cells. Computer simulation has been employed as a powerful tool to predict the properties of the rigid‐rod polymers.

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Water and phosphoric acid uptake of poly [2,5-benzimidazole] (ABPBI) membranes prepared by low and high temperature casting

Cited by 51 publications

References 43 publications

Membranes for Direct Alcohol Fuel Cells

Membranes for Direct Alcohol Fuel Cells

Membrane electrode assemblies doped with H3PO4 for high temperature proton exchange membrane fuel cells

Rigid‐Rod Polymers

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