Water transport in liquid and vapour equilibrated Nafion™ membranes

Romero, Tatiana; Mérida, Walter

doi:10.1016/j.memsci.2009.04.018

Cited by 57 publications

(44 citation statements)

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“…The hydration level of membranes differ between liquid-and vapour-equilibrated, e.g. 100 %RH, environments [44][45][46]. For this reason and an approximation to the real DMFC conditions (aqueous solution in anode), the samples were soaked in Milli-Q water which was added to the measuring cell in each experiment.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

Mollá

Compañ

2015

Journal of Membrane Science

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Novel nanocomposite membranes were prepared by infiltration of a blend of sulfonated PEEK (SPEEK) with polyvinyl alcohol (PVA), using water as solvent, into electrospun nanofibers of SPEEK blended with polyvinyl butyral (PVB). The membranes were characterized for their application on Direct Methanol Fuel Cells (DMFCs) operating at moderate temperatures (>80 ºC). An important role of the solvent on the crosslinking temperature for the SPEEK-PVA system was observed. A mat of hydrated SPEEK-30%PVB nanofibers revealed a higher proton conductivity in comparison with a dense membrane of similar composition. Incorporation of the nanofiber mats to the SPEEK-35%PVA matrix provided mechanical stability, methanol barrier properties and certain proton conductivity up to a crosslinking temperature of 120 ºC. Not remarkable effect of the nanofibers was found above that crosslinking temperature. The combined effect of the nanofibers and crosslinking temperature on the properties of the membranes is discussed. DMFC performance experiments concluded promising results for this new low-cost type of membranes, although further optimization steps are still required.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

Mollá

Compañ

2015

Journal of Membrane Science

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“…Further details of the measurements are described previously. 10,11,32 LLP.-Water permeation driven by a hydraulic pressure gradient ͑defined LLP͒ was measured using the setup illustrated in Fig. 2c.A syringe, mass flowmeter, and pressure transducer were connected in series.…”

Section: Methodsmentioning

confidence: 99%

“…Similar to the case of VDP, this is due to the decreasing RH of the dry side, which increases the driving force for permeation. Because the LDP fluxes are 4-5 times larger than VDP, which is a consequence of having at least one liquid/membrane interface, 10,12 severe dehydration of the membrane on the dry side is less likely. Thus, the flux did not reach a maximum within the flow rate studied.…”

Section: -12mentioning

confidence: 99%

“…Liquid-dry permeation ͑LDP͒, for which one side of the membrane is exposed to liquid water and dry helium gas is flowed over the other. 10,11 3. Liquid-liquid permeation ͑LLP͒, for which both sides of the membrane are exposed to liquid water and water permeation is driven by a hydraulic pressure gradient.…”

mentioning

confidence: 99%

“…8,9 Ex situ studies of water permeation through Nafion membranes reveal the importance of water vapor transport at the membrane interfaces. 8,[10][11][12][13] Water permeation through membranes exposed to liquid water on one side and nonsaturated vapor on the other is much larger than for membranes exposed to a differential water vapor pressure. Hydraulic pressure-driven water permeation, i.e., water permeation when the membrane is exposed to liquid water on both sides, is generally greater for membranes exposed to vapor on both sides, but smaller for membranes exposed to liquid water on one side and water vapor on the other.…”

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confidence: 99%

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Water Permeation Through Catalyst-Coated Membranes

Adachi¹,

Romero²,

Navessin³

et al. 2010

Electrochem. Solid-State Lett.

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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/10.1149/1.3357339Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Water permeation through catalyst-coated membranes Adachi, Makoto; Romero, Tatiana; Navessin, Titichai; Xie, Zhong; Shi, Zhiqing; Mérida, Walter; Holdcroft, Steven http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=38de042b-4512-4f66-80c9-98816a8eac50 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=38de042b-4512-4f66-80c9-98816a8eac50 Water permeabilities, driven by concentration or pressure gradients, through NRE211 and catalyst-coated membranes are reported, and the effect of the catalyst layer ͑ϳ18 m thick, 30 wt % Nafion ionomer, carbon-supported Pt, 0.4 mg Pt cm −2 ͒ on membrane water permeation is deconvoluted. For the system studied, water permeation is limited by the bulk membrane; the effect of the catalyst layer was insignificant and, despite catalyst layers being deposited on the membrane's surface, it does not influence the rates of sorption or desorption at membrane interfaces. © 2010 The Electrochemical Society. ͓DOI: 10.1149/1.3357339͔ All rights reserved. During proton exchange membrane ͑PEM͒ fuel cell operation, water accumulates at the cathode due to both the electrochemical reduction of oxygen and electro-osmotic drag ͑EOD͒. An excess of water at the cathode may restrict oxygen from reaching catalytic reaction sites. [1][2][3] In contrast, the anode may suffer dehydration if the reactant gas is dry or if EOD is large, which leads to an increase in proton resistance. [4][5][6][7] Except for very low current densities, the transport of protons and reactant gases collectively determine the current generated by a PEM fuel cell. Maintaining ...

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Dynamic Thermal, Transport and Mechanical Model of Fuel Cell Membrane Swelling

2011

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When polymer electrolyte membrane materials are exposed to liquid water, they swell and distort. This frustrates the process of depositing liquid catalyst ink directly onto the membrane. We present a model predicting the transient compositional, thermal, and mechanical response of a membrane undergoing changes in water content. The model describes coupled heat and mass transfer and solid mechanics and is capable of describing the large changes in size and shape exhibited by a swelling membrane. Simulation results are presented for sorption and desorption and for the process of drying a saturated piece of membrane with an aqueous coating applied. We suggest that the well‐established discrepancy in the rate of sorption and desorption may be partially due to pressure‐driven diffusion effects absent in other models but present in ours. We also demonstrate that the model can represent the transient curling behavior of a membrane undergoing nonuniform changes in water content. The model will later be used to predict manufacturing defects caused by swelling‐induced wrinkling.

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Water transport in liquid and vapour equilibrated Nafion™ membranes

Cited by 57 publications

References 46 publications

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

Nanocomposite SPEEK-based membranes for Direct Methanol Fuel Cells at intermediate temperatures

Water Permeation Through Catalyst-Coated Membranes

Dynamic Thermal, Transport and Mechanical Model of Fuel Cell Membrane Swelling

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