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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Enhanced proton conductivity of multiblock poly(phenylene ether ketone)s via pendant sulfoalkoxyl side chains with excellent H-2/air fuel cell performance
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Enhanced proton conductivity of multiblock poly(phenylene ether ketone)s via pendant sulfoalkoxyl side chains with excellent H-2/air fuel cell performance

机译：通过悬垂的磺基烷氧基侧链增强多嵌段聚（苯醚酮）的质子电导率，具有优异的H-2/空气燃料电池性能

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摘要

A new class of fully hydrophilic multiblock copolymers consisting of pendant sulfoalkoxyl side chains and hydrophobic oligo(phenylene ether ketone)s have been prepared as proton exchange membranes for fuel cells. The high density of sulfonic acid groups together with the side chain flexibility greatly enhanced the phase separation as well as the proton conductivities of the membranes. In particular, a membrane with a low ion exchange capacity (IEC) of 1.41 mequiv. g(-1) showed better ion conduction capacity than Nafion (NRE 212) over the entire relative humidity (RH) range (30-95). Furthermore, it also exhibited outstanding PEM fuel cell performance at 70 degrees C under various RH conditions, i.e., higher power densities of 0.768, 0.626 and 0.410 W cm(-2) were achieved at 80, 50 and 30 RH, respectively, compared to those of Nafion. By calculating the Flory-Huggins chi-parameters, a mesodynamics simulation approach from coarse-grained (CG) modeling was carried out to capture the qualitative morphologies. The modeling results were consistent with the observations from transmission electron microscopy (TEM) images and provided insightful structure-performance relationships. Overall, the results of this work suggest that these types of copolymers have tremendous potential as alternatives to perfluorosulfonic acid membranes in PEM fuel cell applications.
机译：制备了一类由磺基烷基侧链和疏水性寡聚物（苯醚酮）组成的新型全亲水多嵌段共聚物，作为燃料电池的质子交换膜。磺酸基团的高密度和侧链的柔韧性大大增强了膜的相分离和质子电导率。特别是，具有1.41 mequiv的低离子交换容量（IEC）的膜。g（-1）在整个相对湿度（RH）范围内（30-95%）显示出比Nafion（NRE 212）更好的离子传导能力。此外，在各种相对湿度条件下，它在70°C下也表现出出色的PEM燃料电池性能，即在80%、50%和30%相对湿度下，功率密度分别达到0.768、0.626和0.410 W cm（-2）。通过计算Flory-Huggins卡参数，采用粗粒度（CG）建模的介观动力学模拟方法捕获了定性形貌。建模结果与透射电子显微镜（TEM）图像的观测结果一致，并提供了富有洞察力的结构-性能关系。总体而言，这项工作的结果表明，这些类型的共聚物在PEM燃料电池应用中作为全氟磺酸膜的替代品具有巨大的潜力。

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