Vehicle Mechanism, A New Model for the Interpretation of the Conductivity of Fast Proton Conductors

Kreuer, Klaus‐Dieter; Rabenau, A.; Weppner, W.

doi:10.1002/anie.198202082

Cited by 783 publications

(522 citation statements)

References 6 publications

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“…This results in lower activation energy for proton transport [20]. The conductivity mechanism at relatively low concentrations of hydronium is likely taking place as "vehicular" transport, in which proton migration is assisted by translational dynamics of larger species, "vehicles", [21] here identified as…”

Section: Figure 4 A) the Real And B) The Imaginary Parts Of The Impementioning

confidence: 97%

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Larsson

Wang

Berggren

et al. 2010

Sensors and Actuators B: Chemical

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Low-cost passive wireless electronic sensor labels glued onto packages are highly desirable since they enable monitoring of the status of the packages for instance along the logistic chain or while stored at a shelf. Such additional sensing feature would be of great value for many producers and vendors, active in e.g. the food or construction industries. Here, we explore a novel concept for wireless sensing and readout, in which the humidity sensitive ionic motion in a polyelectrolyte membrane is directly translated into a shift of the resonance frequency of a resonance circuit. Thanks to its simplicity, the wireless sensor device itself can be manufactured entirely using common printing techniques and can be integrated into a lowcost passive electronic sensor label.

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Section: Figure 4 A) the Real And B) The Imaginary Parts Of The Impementioning

confidence: 97%

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Larsson

Wang

Berggren

et al. 2010

Sensors and Actuators B: Chemical

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“…Water is a vehicle for protons during the proton conduction process and an increase of the water content inside the membrane increases the proton mobility according to the vehicle mechanism [53]. On the other hand, the increase of water uptake dilutes the protons and decreases the density of carriers.…”

Section: Sample Labelmentioning

confidence: 99%

On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

Zhang

Désilets

Felice

et al. 2011

Journal of Power Sources

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a b s t r a c tAlthough zeolites are introduced to decrease methanol crossover of Nafion membranes for direct methanol fuel cells (DMFCs), little is known about the effect of their intrinsic properties and the interaction with the ionomer. In this work, Nafion-Faujasite composite membranes prepared by solution casting were characterized by extensive physicochemical and electrochemical techniques. Faujasite was found to undergo severe dealumination during the membrane activation, but its structure remained intact. The zeolite interacts with Nafion probably through hydrogen bonding between Si-OH and SO 3 H groups, which combined with the increase of the water uptake and the water mobility, and the addition of a less conductive phase (the zeolite) leads to an optimum proton conductivity between 0.98 and 2 wt% of zeolite. Hot pressing the membranes before their assembling with the electrodes enhanced the DMFC performance by reducing the methanol crossover and the serial resistance.

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“…Water is the main vehicle by which protons are transported through the membrane, [16] therefore it is an essential requirement to promote proton conductivity. Excessively high levels of water in the membrane however, can result in excessive dimensional changes (swelling) leading to failures in mechanical properties and, in extreme cases, membrane solubility in water.…”

Section: Membrane Water Management and Proton Conductivitymentioning

confidence: 99%

Highly Fluorinated Comb‐Shaped Copolymers as Proton Exchange Membranes (PEMs): Improving PEM Properties Through Rational Design

Norsten

Guiver

Murphy

et al. 2006

Adv Funct Materials

182

139

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A new class of comb‐shaped polymers for use as a proton conducting membrane is presented. The polymer is designed to combine the beneficial physical, chemical, and structural attributes of fluorinated Nafion‐like materials with higher‐temperature, polyaromatic‐based polymer backbones. The comb‐shaped polymer unites a rigid, polyaromatic, hydrophobic backbone with lengthy hydrophilic polymer side chains; this combination affords direct control over the polymer nanostructure within the membrane and results in distinct microphase separation between the opposing domains. The microphase separation serves to compartmentalize water into the hydrophilic polymer side chain domains, resulting in effective membrane water management and excellent proton conductivities.

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Vehicle Mechanism, A New Model for the Interpretation of the Conductivity of Fast Proton Conductors

Cited by 783 publications

References 6 publications

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

On the proton conductivity of Nafion–Faujasite composite membranes for low temperature direct methanol fuel cells

Highly Fluorinated Comb‐Shaped Copolymers as Proton Exchange Membranes (PEMs): Improving PEM Properties Through Rational Design

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