Electrochemical behaviour of nafion type membrane

“…The proton conductivity was measured by impedance spectroscopy (IS) using a Zahner electrochemical workstation IM6e in a frequency range from 1 to 10 6 Hz with an oscillating voltage of 100 mV. Prior to the measurement, the functionalised powders were pressed into small pellets 8 mm in diameter and 0.5-1 mm in thickness, which were inserted between two thin graphite slices (8 mm in diameter).…”

Section: Characterisationmentioning

confidence: 99%

Insight into Proton Conduction of Immobilised Imidazole Systems Via Simulations and Impedance Spectroscopy

et al. 2008

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The proton conduction in immobilised imidazole systems has been investigated in order to support the design of new membrane materials for polymer electrolyte membrane fuel cells (PEMFC). In the experimental part of this work, proton conductivities are measured via impedance spectroscopy. The simulation and modelling are performed combining molecular dynamics simulations and energy barrier calculations; the analysis is done via the proton jump energy barrier, collision ratio and radial distribution function. The dependence of the proton mobility on the temperature, spacer length and the density of conducting groups per area is presented. Donors and acceptors groups approach to each other within a distance from 2.8 to 3 Å where the energy barrier for a proton transfer is very low, which favours the proton jump under the studied conditions. The proton conductivity increases with increase in the spacer length. The simulation results are in good agreement with the proton conductivities presented.

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“…Currently, perfluorosulfonated ionomer (PFSI) membranes, like DuPont's Nafion ® and Asahi Chemical's Aciplex ® , are used due to their excellent proton conductivity, mechanical strength and thermal and chemical stability [7][8][9][10][11]. However, these materials also have drawbacks like high methanol cross-over, especially at high methanol concentrations and, high cost (US$ 700/m 2 ) due to the expensive fluorination step.…”

Section: Introductionmentioning

confidence: 99%

Dimensionally stable Nafion–polyethylene composite membranes for direct methanol fuel cell applications

Yildirim

Stamatialis

Weßling

2008

Journal of Membrane Science

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Electrochemical behaviour of nafion type membrane

Cited by 42 publications

References 10 publications

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Insight into Proton Conduction of Immobilised Imidazole Systems Via Simulations and Impedance Spectroscopy

Dimensionally stable Nafion–polyethylene composite membranes for direct methanol fuel cell applications

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