Modified Sulfonated Poly(arylene ether sulfone) Membranes Prepared via a Radiation Grafting Method for Fuel Cell Application

Park, Chi Hoon; Shin, Dong Won; Lee, Young Moo; Kang, Phil Hyun; Nho, Young Chang

doi:10.1007/bf03218622

Cited by 10 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To explain these behaviors, an understanding of proton transport mechanisms is required. There are two mechanisms, the vehicle mechanism and the hopping (or Grotthus) mechanism, that are widely accepted to explain proton transport behavior in PEMs. − In the vehicle mechanism, protons are transported through water channels in complex forms with water molecules such as H 3 O + , H 5 O 2 + , and H 9 O 4 + . Accordingly, the effects of water uptake on proton conductivity can be explained via the vehicle mechanism.…”

Section: Resultsmentioning

confidence: 99%

Phase Separation and Water Channel Formation in Sulfonated Block Copolyimide

et al. 2010

Self Cite

View full text Add to dashboard Cite

Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=8d7de2db-497c-4114-a4b2-c67045bf8c68 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=8d7de2db-497c-4114-a4b2-c67045bf8c68 We compared experimental and simulated data to investigate the phase separation and water channel formation of proton exchange membranes (PEMs) for fuel cell. Sulfonated block copolyimides (SPIs) were adopted as model polymers for experiments and simulations, and Nafion was used as a reference. Nafion and SPIs were observed to have different microscopic structures such as constituent atoms, backbone rigidity, and the locations of sulfonic acid groups, all of which significantly affect phenomenological properties at the macroscopic level such as density, water uptake, and proton conductivity. In particular, SPIs show much weaker microphase separation than Nafion, mainly due to the lower mobility of sulfonic acid groups and the existence of acceptable sites for hydrogen bonding even in hydrophobic segments, which impedes water channel formation for proton transport. As a result, the phase separation behavior and the resulting water channel formation are the major factors affecting macroscopic properties of PEMs such as water uptake and proton transport. Phase Separation and Water Channel Formation in Sulfonated Block

show abstract

Section: Resultsmentioning

confidence: 99%

Phase Separation and Water Channel Formation in Sulfonated Block Copolyimide

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, their proton conductivities are relatively lower than those of PFSAs because rigid polymer chains hinder ionic channel formation. For these reasons, many studies of inorganic composite membranes, − block copolymers, − pendent or comb-shaped copolymers, ,− and highly sulfonated copolymers − have been carried out to enhance proton conductivity.…”

Section: Introductionmentioning

confidence: 99%

Durable Sulfonated Poly(arylene sulfide sulfone nitrile)s Containing Naphthalene Units for Direct Methanol Fuel Cells (DMFCs)

et al. 2013

Self Cite

View full text Add to dashboard Cite

1Sulfonated poly(arylene sulfide sulfone nitrile)s (SN) were synthesized to investigate the effects 2 of naphthalene units in the polymer backbone on membrane properties. The small and planar 3 naphthalene in the main chain induced semi-crystallinity in the polymer, as confirmed by 4 molecular simulations and wide angle X-ray diffraction patterns. The semi-crystalline SN 5 polymer membranes exhibited excellent chemical and mechanical properties, better than those of 6 their phenylene counterpart (SP). In particular, the water uptake and swelling ratio of the SN 7 membranes were much lower than those of the SP membranes. Furthermore, the SN membranes 8 exhibited a greatly reduced methanol permeability (9-17 × 10 -8 cm 2 s -1 ) compared to Nafion ® 9 117 (240 × 10 -8 cm 2 s -1 ) at 30 o C in 10 M methanol. Moreover, sulfide-and naphthalene-based 10 chemical structure and semi-crystalline nature of the SN membranes enhanced their DMFC 11 single cell performance and long-term stability during fuel cell operation. 12

show abstract

“…These problems of PFSA ionomers have stimulated many efforts in the development of alternative hydrocarbon-based polymer electrolyte membranes (PEMs) such as poly(arylene ether)s, − polyimides, − poly( p -phenylene)s, and polybenzimidazoles. , Although many membrane materials as PEMs have been developed, the performance for PEFCs is still not satisfactory for practical applications. One of the major challenges of hydrocarbon-based PEMs is to increase the ion exchange capacity (IEC) of PEMs for better fuel cell performance.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Highly Fluorinated Cross-linked Aromatic Polyethers for Polymer Electrolytes

et al. 2010

View full text Add to dashboard Cite

New series of ethynyl-terminated sulfonated-fluorinated poly(arylene ether)s (ESF-6Fs) were synthesized via nucleophilic aromatic substitution reaction (SNAr) from potassium 2,5-dihydroxybenzenesulfonate (SHQ), 4,4′-(hexafluoroisopropylidene)diphenol (6FBPA), and decafluorobiphenyl (DFBP), followed by the reaction with 3-ethynylphenol. The cross-linked ESF-6F membranes exhibited high glass-transition temperatures in the range of 258−276 °C and good thermal degradation temperatures in the range of 308−328 °C. To optimize the proton conductivity and water uptake of the cross-linked ESF-6F membranes, various volume-related parameters (length-scaled parameters) were introduced. Using those parameters, the proton conductivity and water uptake of the cross-linked ESF-6F membranes were compared with sulfonated poly(arylene ether sulfone) random copolymer (BPSH), Nafion membrane, and another cross-linked membrane. In addition, the proton conductivity of optimized ESF-6F membrane was observed as a function of relative humidity (RH) at 80 °C and compared with other membranes. Excellent proton conductivity was observed at the percent conducting volume (PCV) (0.39, ESF90-6F) corresponding to the maximum volume-based ion exchange capacity in the hydrate state (IECv(wet)) and the atomic force microscopy (AFM) image showed good ionic channels at that point. Also, for the direct methanol fuel cell (DMFC) application, the cross-linked ESF-6F membranes exhibited lower methanol crossover (11 × 10−8−103 × 10−8 cm2/s) and higher selectivities (130 × 103−492 × 103 s Ω−1 cm−3) than those of Nafion 117 (167 × 10−8 cm2/s and 55 × 103 s Ω−1 cm−3).

show abstract

Modified Sulfonated Poly(arylene ether sulfone) Membranes Prepared via a Radiation Grafting Method for Fuel Cell Application

Cited by 10 publications

References 18 publications

Phase Separation and Water Channel Formation in Sulfonated Block Copolyimide

Phase Separation and Water Channel Formation in Sulfonated Block Copolyimide

Durable Sulfonated Poly(arylene sulfide sulfone nitrile)s Containing Naphthalene Units for Direct Methanol Fuel Cells (DMFCs)

Synthesis and Characterization of Highly Fluorinated Cross-linked Aromatic Polyethers for Polymer Electrolytes

Contact Info

Product

Resources

About