Blend membranes based on sulfonated poly(ether ether ketone) and polysulfone bearing benzimidazole side groups for proton exchange membrane fuel cells

Fu, Yongzhu; Manthiram, Arumugam; Guiver, Michael D.

doi:10.1016/j.elecom.2006.06.018

Cited by 113 publications

(64 citation statements)

References 24 publications

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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%

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Acid–base blend membranes based on 2-amino-benzimidazole and sulfonated poly(ether ether ketone) for direct methanol fuel cells

Manthiram

Guiver

2007

Electrochemistry Communications

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Direct methanol fuel cells (DMFC) are attractive for portable and automobile power needs, but their commercialization is hampered by high methanol permeability and the high cost of the currently used Nafion membrane. We report here a novel, low-cost blend membrane consisting of polysulfone-2-amide-benzimidazole (a basic polymer) and sulfonated poly(ether ether ketone) (an acidic polymer), which facilitates proton conduction through acid-base interactions while preserving excellent chemical and mechanical stabilities. The blend membrane exhibits performance in DMFC much higher than that of Nafion 115 and similar to that of Nafion 112, but with a remarkably superior long-term performance than Nafion 112 due to significantly reduced methanol crossover, enhancing the commercialization prospects of DMFC.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acid–base blend membranes based on 2-amino-benzimidazole and sulfonated poly(ether ether ketone) for direct methanol fuel cells

Manthiram

Guiver

2007

Electrochemistry Communications

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“…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%

Novel Blend Membranes Based on Acid-Base Interactions for Fuel Cells

2012

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Fuel cells hold great promise for wide applications in portable, residential, and large-scale power supplies. For low temperature fuel cells, such as the proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs), proton-exchange membranes (PEMs) are a key component determining the fuel cells performance. PEMs with high proton conductivity under anhydrous conditions can allow PEMFCs to be operated above 100 °C, enabling use of hydrogen fuels with high-CO contents and improving the electrocatalytic activity. PEMs with high proton conductivity and low methanol crossover are critical for lowering catalyst loadings at the cathode and improving the performance and long-term stability of DMFCs. This review provides a summary of a number of novel acid-base blend membranes consisting of an acidic polymer and a basic compound containing N-heterocycle groups, which are promising for PEMFCs and DMFCs.

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“…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.…”

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Blend Membranes Consisting of Sulfonated Poly(ether ether ketone) and Polysulfone Bearing 4-Nitrobenzimidazole for Direct Methanol Fuel Cells

Li¹,

Fu²,

Manthiram³

et al. 2009

J. Electrochem. Soc.

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=1884314&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=1884314&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en 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. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1149/1.3040242 Society, 156, 2, pp. B258-B263, 2009 Blend Low-cost blend membranes consisting of sulfonated poly͑ether ether ketone͒͑ SPEEK͒͑ an acidic polymer͒ and polysulfone-4-nitrobenzimidazole ͑PSf-NBIm͒͑ a basic polymer͒ have been prepared with various PSf-NBIm contents ͑0-5.0 wt %͒ and characterized by ion-exchange capacity, proton conductivity, and water uptake measurements. The blend membranes with PSf-NBIm contents of 2.5 and 5.0 wt % show higher proton conductivity and lower water uptake in water and methanol/water solutions at a given temperature than plain SPEEK. The blend membranes also exhibit better electrochemical performance and lower methanol crossover in a direct methanol fuel cell than plain SPEEK and Nafion 115 membranes due to an enhancement in proton conductivity through acid-base interactions and an insertion of the benzimidazole side groups into the ionic clusters of SPEEK, as indicated by small-angle X-ray scattering. The maximum power density of the blend membrane with a PSf-NBIm content of 2.5 wt % is 1.5 times higher than that of the Nafion 115 in 1 M methanol solution at 80°C. Journal of te Electrochemical

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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

Cited by 113 publications

References 24 publications

Acid–base blend membranes based on 2-amino-benzimidazole and sulfonated poly(ether ether ketone) for direct methanol fuel cells

Acid–base blend membranes based on 2-amino-benzimidazole and sulfonated poly(ether ether ketone) for direct methanol fuel cells

Novel Blend Membranes Based on Acid-Base Interactions for Fuel Cells

Blend Membranes Consisting of Sulfonated Poly(ether ether ketone) and Polysulfone Bearing 4-Nitrobenzimidazole for Direct Methanol Fuel Cells

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