Introduction

Hoogers, Gregor

doi:10.1201/9781420041552.sec1

Cited by 21 publications

(38 citation statements)

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“…Primary concerns are global warming, the depletion of fossil fuels, and the need to reduce CO 2 emissions as the byproduct of the automotive and utility industries. As these concerns have grown to alarming levels, clean energy technologies such as fuel cells have grown exponentially [1]. The most imperative driver of new alternative energy is the conceivable weariness of petroleum products inside the following couple of decades.…”

Section: Introductionmentioning

confidence: 99%

Proton Conductivity and Free Volume Properties in Per-Fluorinated Sulfonic acid/PTFE Copolymer for Fuel Cell

2017

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The proton conductivity mechanism in per-fluorinated sulfonic acid/PTFE copolymer Fumapem ® membranes for polymer electrolyte membranes has been investigated. Three samples of Fumapem ® F-950, F-1050 and F-14100 membranes with different ion exchange capacity 1.05, 0.95, and 0.71 meq/g, respectively, were used in this study after drying. The o-Ps hole volume size (VF V,Ps) was quantified using the positron annihilation lifetime technique while the proton conductivities (σ) were measured using LCR Bridge as function of temperature. It was found that as the ion exchange capacity increases, the proton conductivity increases and the free volume expands. Temperature dependences of proton conductivity and the o-Ps hole volume size (VF V,Ps) reflect the glass transition temperature of the membrane. A good linear correlation between the reciprocal of the o-Ps hole volume size (1/VF V,Ps) and log(σ) + ∆Ea/2.303kBT , (where ∆Ea is the activation energy, T is the absolute temperature and kB is the Boltzmann constant) at different temperatures indicate that the ionic motion in dry Fumapem ® is governed by the free volume. A linear relationship between the critical hole size γV * i and the ion exchange capacity was also achieved.

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Section: Introductionmentioning

confidence: 99%

Proton Conductivity and Free Volume Properties in Per-Fluorinated Sulfonic acid/PTFE Copolymer for Fuel Cell

2017

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“…An approach for analytically determining the water transfer within the cell based on the operating conditions will be presented in section 2.5. 6. Figure 2.4 gives a good overview of the occurring gas and water transport processes for the anode and cathode compartments.…”

Section: Membrane Conductivitymentioning

confidence: 99%

“…They are typically classified by either their operating temperature or the type of electrolyte. [6].…”

Section: Introduction To Fuel Cellsmentioning

confidence: 99%

An Analytical, Control-Oriented State Space Model for a PEM Fuel Cell System

Grasser

Rufer

2007

2007 Power Conversion Conference - Nagoya

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“…PEMFC differs from most other fuel cells as it uses a solid polymer membrane as electrolyte, as opposed to a liquid electrolyte. This feature, along with the low operating temperature, makes it attractive for automotive applications [4]. However, many problems need to be solved before large scale commercialization such as high cost and thermal stability of the proton exchange membrane (PEM).…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization of Nafion®g HP JP as a Proton Exchange Membrane for Fuel Cell: Positron Annihilation Study

et al. 2017

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Free volume size V f and proton conductivity σ of a novel polymer electrolyte membrane were investigated as a function of temperature and relative humidity up to 140• C and 80%, respectively. The free volume size V f for Nafion ® HP JP reflect the α-transition temperature at about 98• C. In addition the free volume size V f for Nafion ® HP JP is smaller than that for Nafion ® NRE212 membrane which leads to lower methanol permeability of the former membrane. The proton conductivity σ for Nafion ® HP JP decreases with increase of temperature up to transition temperature due to free and bound water loss, then it starts to increase due to dynamic segmental motion. It increases for Nafion ® HP JP with the increase of the relative humidity. A good correlation between V f and σ was successfully established for both membranes which indicates that σ is governed by the free volume. In conclusion, Nafion ® HP JP is a suitable membrane for a proton exchange membrane fuel cell application.

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Introduction

Cited by 21 publications

References 0 publications

Proton Conductivity and Free Volume Properties in Per-Fluorinated Sulfonic acid/PTFE Copolymer for Fuel Cell

Proton Conductivity and Free Volume Properties in Per-Fluorinated Sulfonic acid/PTFE Copolymer for Fuel Cell

An Analytical, Control-Oriented State Space Model for a PEM Fuel Cell System

Microstructure Characterization of Nafion®g HP JP as a Proton Exchange Membrane for Fuel Cell: Positron Annihilation Study

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