Reinforced Composite Membranes Based on Expanded Polytetrafluoroethylene Skeletons Modified by a Surface Sol–Gel Process for Fuel Cell Applications,Energy & Fuels

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Reinforced Composite Membranes Based on Expanded Polytetrafluoroethylene Skeletons Modified by a Surface Sol–Gel Process for Fuel Cell Applications
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-07-19 , DOI: 10.1021/acs.energyfuels.1c01205
Lei Liu ₁ , Yizhe Li ₂ , Rui Qiao ₁ , Yijing Xing ₁ , Haibin Li ₁

Affiliation

Intercalating expanded polytetrafluoroethylene (ePTFE) reinforcements and incorporating antioxidants (e.g., CeO₂ and ZrO₂) into perfluorosulfonic acid (PFSA) ionomers are typical methods used to improve the physical and chemical durability of PFSA-based proton exchange membranes, respectively. Nevertheless, these two popular methods still suffer from respective inherent limitations, including the poor interfacial binding between hydrophobic ePTFE and polar PFSA ionomers and the migration and loss of incorporated antioxidants. To solve these two issues simultaneously, we propose a solution based on a surface sol–gel process, by which the deposition of ZrO₂ coating on polydopamine-modified ePTFE skeletons not only improves the interfacial bonding of the skeletons and PFSA ionomer but also restrains the migration and loss of antioxidant additives. The results show that the ZrO₂-deposited ePTFE exhibits improved hydrophilicity and the reinforced composite membranes based on the modified ePTFE skeletons with one layer of ZrO₂ coating are endowed with superior proton conductivity, mechanical properties, dimensional stability, and open-circuit voltage durability. In addition, the stability of the ZrO₂ coating on the ePTFE skeletons is also verified.

中文翻译：

用于燃料电池应用的基于表面溶胶-凝胶工艺改性的膨胀聚四氟乙烯骨架的增强复合膜

插入膨胀聚四氟乙烯 (ePTFE) 增强材料并将抗氧化剂（例如，CeO ₂和 ZrO ₂）加入全氟磺酸 (PFSA) 离聚物是分别用于提高基于 PFSA 的质子交换膜的物理和化学耐久性的典型方法。尽管如此，这两种流行的方法仍然存在各自固有的局限性，包括疏水性 ePTFE 和极性 PFSA 离聚物之间的界面结合较差，以及掺入的抗氧化剂的迁移和损失。为了同时解决这两个问题，我们提出了一种基于表面溶胶-凝胶工艺的解决方案，通过该工艺，ZrO ₂的沉积在聚多巴胺改性的 ePTFE 骨架上进行涂层不仅改善了骨架和 PFSA 离聚物的界面结合，而且还抑制了抗氧化剂添加剂的迁移和损失。结果表明，ZrO ₂沉积的 ePTFE 表现出改善的亲水性，基于改性 ePTFE 骨架和一层 ZrO ₂涂层的增强复合膜具有优异的质子传导性、机械性能、尺寸稳定性和开路电压耐久性. 此外，还验证了 ePTFE 骨架上ZrO ₂涂层的稳定性。

更新日期：2021-08-05

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