Structure and transport properties of solution-cast Nafion® membranes subjected to hygrothermal aging

Collette, Floraine; Thominette, F.; Mendil‐Jakani, Hakima; Gebel, Gérard

doi:10.1016/j.memsci.2013.02.002

Cited by 50 publications

(85 citation statements)

References 56 publications

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“…11). This is consistent with the results of the study from Collette et al, wherein membranes were degraded by hydrothermal aging [40]. Even though, the water content of the degraded membranes decreased with aging time, in that case, the IEC of membrane also decreased from~0.9 to~zero mmol g À1 after 450 days of hygrothermal aging.…”

Section: Discussionsupporting

confidence: 92%

“…Consequently, l for their aged membranes increased significantly. The discrepancy in changes of water content between Collette et al [40] and current study may arise from the different degradation testing procedures (i.e., hydrothermal aging vs. Fenton's reagent). In addition, based on our SEM results, there are large numbers of bubbles and cracks that appear in the degraded membrane which may be a source of water uptake.…”

Section: Discussioncontrasting

confidence: 77%

“…Qiao [35,36]. Ex-situ methods to generate free radicals, besides Fenton's reagent, have also used to study membrane degradation, these include, gamma-ray [37], X-ray radiation [38], hydrothermal [39,40] and electron beam techniques [41]. Collette et al studied water uptake of hydrothermally-aged Nafion ® 112 and Nafion ® 212 [39,40].…”

Section: Introductionmentioning

confidence: 99%

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Effect of free radical-induced degradation on water permeation through PFSA ionomer membranes

Luo

Ghassemzadeh

Holdcroft

2015

International Journal of Hydrogen Energy

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Section: Discussionsupporting

confidence: 92%

Section: Discussioncontrasting

confidence: 77%

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Effect of free radical-induced degradation on water permeation through PFSA ionomer membranes

Luo

Ghassemzadeh

Holdcroft

2015

International Journal of Hydrogen Energy

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“…In addition to the effect of humidity and temperature, contaminants also play a significant role during hygrothermal ageing. The hygrothermal ageing process is has been shown to be faster for Nafion 112 than for Nafion 212 membrane, which was hypothesized to be due to the latter one being more chemically stable and containing less contaminants (3,5). Although there are some reports on the properties of membranes after ageing, how and to what extent different hygrothermal ageing conditions impact the properties of the membrane is still not clear, especially how pretreatment affects ageing since most studies used only as-received samples.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hygrothermal Ageing on PFSA Ionomers' Structure/Property Relationship

et al. 2015

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Perfluorosulfonic-acid (PFSA) membranes are frequently subjected to high humidity and temperature cycles during fuel-cell operation. It is of great interest to understand how the properties of the membrane change with ageing conditions and time. In this study, we investigate how the properties of as-received and pretreated Nafion membranes change after exposure to hygrothermal ageing, including the chemical structure, mechanical properties, water uptake, ionic conductivity, and morphology. Our findings demonstrate that anhydrides form during ageing via a condensation reaction, which results in chemical crosslinks that impair the membrane functionalities by reducing water uptake and conductivity and increasing the storage modulus and α relaxation temperature. In addition, a membrane aged in a 75% relativehumidity environment exhibits more dramatic changes compared to that aged in 100% conditions. It is also shown that the impact of ageing can be recovered through a post-treatment by boiling the membrane in strong acid.

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“…In order to justify the relation (11), we analysed the experimental data published by Collette et al [55,56]. The authors studied the time changes of membrane conductivity and ion-exchange capacity (acid group concentration) of the perfluorinated membranes Nafion 212 and Nafion 112 degraded in a climatic chamber.…”

Section: Acid Group Concentrationmentioning

confidence: 99%

Membrane degradation model for 3D CFD analysis of fuel cell performance as a function of time

Karpenko-Jereb

Sternig

Fink

et al. 2016

International Journal of Hydrogen Energy

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Available online xxxKeywords: Polymer electrolyte fuel cell Nafion degradation Modelling Computational fluid dynamics Local operating condition a b s t r a c t The paper describes a development of a degradation model, which enables to predict timedependent changes in performance of a polymer electrolyte fuel cell. The developed model consists of two main parts: 1) a new semi-empirical model taking into account changes in physico-chemical properties of a polymer electrolyte membrane operating in the fuel cell, 2) a validated CFD model computing the 3D performance of the cell. In the semi-empirical model, the degradation rates of the membrane thickness and conductivity depend on the oxygen crossover rate. The acid group concentration is calculated from the membrane conductivity based on the percolation theory approach. The gas diffusion coefficients are modelled empirically as a function of the membrane thickness. The model of the membrane degradation is coupled with the CFD model and applied to analyse the cell behaviour as a function of time. The simulation shows that the cell current density decreases faster with lowering relative humidity and increasing temperature. The in-plane degradation of the membrane is non-uniform and depends on the local operating condition.

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Structure and transport properties of solution-cast Nafion® membranes subjected to hygrothermal aging

Cited by 50 publications

References 56 publications

Effect of free radical-induced degradation on water permeation through PFSA ionomer membranes

Effect of free radical-induced degradation on water permeation through PFSA ionomer membranes

Effect of Hygrothermal Ageing on PFSA Ionomers' Structure/Property Relationship

Membrane degradation model for 3D CFD analysis of fuel cell performance as a function of time

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