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Charge effectiveness of sulfonated polymer membranes under low-water-content condition

机译：低水含量条件下磺化聚合物膜的电荷效率

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In this study, the effective charge density of a sulfonated polymer membrane was investigated under low-water-content condition in order to develop novel polyelectrolyte membrane for the fuel cell which can be operated without humidification. At first, the sulfonated polymer membranes, which have various water contents and an inhomogeneous fixed-charge distribution, were prepared, and then the membrane potentials across them were measured. The experimental results were analyzed on the basis of the Donnan equilibrium theory and the Nernst-Planck transport equation considering the fixed-charge inhomogeneities in the membrane. It was revealed that the charge effectiveness depended on the water content, the ionic radii of the counterions and the valence of the counterion. In order to interpret the variation of the charge effectiveness depending on those values, the ion-pair theory based on the Fuoss formula was introduced. This approach showed that the ion-pairing effect causes the difference between the effective charge density and the fixed-charge density especially for low-water-content condition.
机译：在这项研究中，研究了磺化聚合物膜在低水含量条件下的有效电荷密度，以便开发出一种新型的燃料电池用聚电解质膜，该膜无需加湿即可运行。首先，制备具有各种水含量和不均匀固定电荷分布的磺化聚合物膜，然后测量跨膜的膜电位。基于Donnan平衡理论和Nernst-Planck输运方程，考虑了膜中固定电荷的不均匀性，对实验结果进行了分析。揭示了带电效率取决于水含量，平衡离子的离子半径和平衡离子的化合价。为了解释电荷效率取决于这些值的变化，引入了基于Fuoss公式的离子对理论。这种方法表明，离子对效应导致有效电荷密度和固定电荷密度之间的差异，特别是在低含水量条件下。

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