Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Lain, Luigi; Barragán, V.M.

doi:10.1016/j.ijhydene.2016.05.283

Cited by 10 publications

(11 citation statements)

References 32 publications

(54 reference statements)

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“…The membrane swelling degree ( Figure 6 c) increased for the AEMs, whereas it decreased for CEMs after the immersion of membranes in the NaOH or HCl solution. The observed variation in swelling degree values of AEMs may be related to the alteration of the hydrophilic nature of the membrane matrix, which was consistent with reports from T. Chakrabarty [ 42 ] and L. Laín [ 43 ].…”

Section: Resultssupporting

confidence: 91%

Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH

et al. 2021

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Ion-exchange membranes (IEMs) represent a key component in various electrochemical energy conversion and storage systems. In this study, electrochemical impedance spectroscopy (EIS) was used to investigate the effects of structural changes of anion exchange membranes (AEMs) on the bulk membrane and interface properties as a function of solution pH. The variations in the physico/electrochemical properties, including ion exchange capacity, swelling degree, fixed charge density, zeta potentials as well as membrane and interface resistances of two commercial AEMs and cation exchange membranes (CEMs, as a control) were systematically investigated in different pH environments. Structural changes of the membrane surface were analyzed by Fourier transform infrared and X-ray photoelectron spectroscopy. Most notably, at high pH (pH > 10), the membrane (Rm) and the diffusion boundary layer resistances (Rdbl) increased for the two AEMs, whereas the electrical double layer resistance decreased simultaneously. This increase in Rm and Rdbl was mainly attributed to the deprotonation of the tertiary amino groups (-NR2H+) as a membrane functionality. Our results show that the local pH at the membrane-solution interface plays a crucial role on membrane electrochemical properties in IEM transport processes, particularly for AEMs.

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Section: Resultssupporting

confidence: 91%

Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH

et al. 2021

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“…It was observed in a previous work [26] that the doping process had low influence on the membrane water uptake. Thus, for denser homogeneous membranes, it cannot be the cause of the observed decrease in the alcohol permeability.…”

Section: Au(%)mentioning

confidence: 83%

“…Table 1 shows some of their main properties. The doping solutions used in this study were selected taking into account the results obtained in a previous work with these same membranes [26]. In that work, it was observed that heterogeneous membrane PP presented the maximum doping capacity, and the homogeneous non-reinforced FAP membrane only presented a significant doping capacity in 1-propanol media.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous work [ 26 ], a correlation was observed between the alkali-doping capacity and the swelling properties of different commercial anion exchange membranes. An effect of the doping process on their alcohol permeability, and so in the diffusion contribution to the alcohol crossover, would be expected when these membranes are used as the electrolyte in direct alcohol fuel cells.…”

Section: Introductionmentioning

confidence: 94%

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Alcohol Diffusion in Alkali-Metal-Doped Polymeric Membranes for Using in Alkaline Direct Alcohol Fuel Cells

2022

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The alcohol permeability of anion exchange membranes is a crucial property when they are used as a solid electrolyte in alkaline direct alcohol fuel cells and electrolyzers. The membrane is the core component to impede the fuel crossover and allows the ionic transport, and it strongly affects the fuel cell performance. The aim of this work is to compare different anion exchange membranes to be used as an electrolyte in alkaline direct alcohol fuels cells. The alcohol permeability of four commercial anion exchange membranes with different structure were analyzed in several hydro-organic media. The membranes were doped using different types of alkaline doping agents (LiOH, NaOH, and KOH) and different conditions to analyze the effect of the treatment on the membrane behavior. Methanol, ethanol, and 1-propanol were analyzed. The study was focused on the diffusive contribution to the alcohol crossover that affects the fuel cell performance. To this purpose, alcohol permeability was determined for various membrane systems. The results show that membrane alcohol permeability is affected by the doping conditions, depending on the effect on the type of membrane and alcohol nature. In general, heterogeneous membranes presented a positive correlation between alcohol permeability and doping capacity, with a lower effect for larger-size alcohols. A definite trend was not observed for homogeneous membranes.

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“…Sata [12]. Svoboda et al examined the effect of salt concentration on heterogeneous CEM swelling and found out that it is one of the major factors influencing this feature.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Ion Exchange Material Behavior under Pressure Simulating Electro-Membrane Cell Conditions

Zich

Václavíková

2017

Period. Polytech. Chem. Eng.

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Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Cited by 10 publications

References 32 publications

Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH

Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH

Alcohol Diffusion in Alkali-Metal-Doped Polymeric Membranes for Using in Alkaline Direct Alcohol Fuel Cells

Characterization of Ion Exchange Material Behavior under Pressure Simulating Electro-Membrane Cell Conditions

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