Ion Dynamics and Mechanical Properties of Sulfonated Polybenzimidazole Membranes for High-Temperature Proton Exchange Membrane Fuel Cells,The Journal of Physical Chemistry C

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Ion Dynamics and Mechanical Properties of Sulfonated Polybenzimidazole Membranes for High-Temperature Proton Exchange Membrane Fuel Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2015-04-28 00:00:00 , DOI: 10.1021/acs.jpcc.5b01067
Isabella Nicotera ₁ , Vasiliki Kosma ₁ , Cataldo Simari ₁ , Simone Angioni ₂ , Piercarlo Mustarelli ₂ , Eliana Quartarone ₂

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Polybenzimidazole (PBI)-based membranes are one of the systems of choice for polymer electrolyte fuel cells. Monomer sulphonation is one of the strategies suggested to improve proton transport in these membranes. We report a NMR and dynamic mechanical study aiming to investigate the effect of the sulphonation on the proton dynamics and the mechanical properties of the membranes. The analyses of ¹H self-diffusion coefficients and ¹H and ³¹P spectra versus temperature show that sulphonation causes the formation of interchain cross-links, which involve phosphoric acid molecules and the sulfonic groups. This, in turn, reduces the proton mobility and, consequently, the ionic conductivity. The increase of the membrane stiffness with sulphonation is confirmed by dynamic mechanical analysis through the behavior of the storage modulus.

中文翻译：

高温质子交换膜燃料电池用磺化聚苯并咪唑膜的离子动力学和力学性能

基于聚苯并咪唑（PBI）的膜是聚合物电解质燃料电池选择的系统之一。单体磺化是改善这些膜中质子传输的策略之一。我们报告了NMR和动态力学研究，旨在研究磺化对质子动力学和膜机械性能的影响。的分析¹ h自扩散系数和¹ H和³¹P光谱与温度的关系表明，磺化会导致链间交联的形成，其中涉及磷酸分子和磺酸基。反过来，这降低了质子迁移率，并因此降低了离子电导率。通过储能模量的动态力学分析，证实了随着磺化作用膜硬度的增加。

更新日期：2015-04-28

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