Nafion/SiO2@TiO2-坡缕石膜具有改进的质子传导性,Journal of Applied Polymer Science

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Nafion/SiO2@TiO2-坡缕石膜具有改进的质子传导性
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-02-05 , DOI: 10.1002/app.52208
Noura Thmaini _{1,

2} , Khaled Charradi ₁ , Zakarya Ahmed ₁ , Pilar Aranda ₂ , Radhouane Chtourou ₁

Affiliation

这项工作涉及 SiO ₂ @TiO ₂负载的坡缕石纤维的合成及其作为质子交换膜燃料电池填料的用途，以提高其性能。SiO ₂ @TiO ₂ -坡缕石纳米结构颗粒按照原路线分别合成，以保证TiO ₂和SiO ₂在粘土表面的生长。因此，将合成填料 (SiO ₂ @TiO ₂ -paly) 引入电解质膜 (Nafion) 旨在改善机械、热和质子传导性能。_二氧化钛纳米粒子是通过溶胶-凝胶法在坡缕石的外表面上产生的。然后，使用类似的溶胶-凝胶工艺在 TiO _{2 -坡缕石颗粒上合成 SiO}₂纳米颗粒，以产生最终的 SiO ₂ @TiO ₂ -坡缕石颗粒。通过X射线衍射、傅里叶变换红外、扫描电子显微镜和透射电子显微镜研究了纳米结构颗粒的物理化学性质。_{使用 SiO 2} @TiO ₂ -坡缕石和 TiO ₂制备 Nafion 基复合膜-坡缕石作为对照标准。与纯 Nafion 膜相比，复合膜显示出改进的机械性能、热稳定性、保水性和质子传导性。质子电导率（在 100°C 和 100% 相对湿度下）从纯 Nafion 的 65.0 mS/cm 增加到 70.4 mS/cm 和加入 TiO ₂ -Paly（6% 重量）和 SiO ₂ @TiO时的 128.6 mS/cm分别为₂ -Paly (6% 重量)。

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Nafion/SiO2@TiO2-palygorskite membranes with improved proton conductivity

This work deals with the synthesis of SiO₂@TiO₂ supported palygorskite fibers and their use as a filler for proton exchange membrane fuel cells in order to improve their performance. SiO₂@TiO₂-palygorskite nanostructured particles were synthesized separately with original route to ensure the growth of TiO₂ and then of SiO₂ on the surface of the clay. Accordingly, the introduction of the synthetic filler (SiO₂@TiO₂-paly) into the electrolyte membrane (Nafion) aims to improve mechanical, thermal, and proton conductivity properties. The TiO₂ nanoparticles were generated via a sol–gel process on the external surface of palygorskite. Then, SiO₂ nanoparticles were synthetized using a similar sol–gel process, onto the TiO₂-palygorskite particles to produce the final SiO₂@TiO₂-palygorskite particles. The physico-chemical properties of the nanostructured particles were studied by X-ray diffractometry, Fourier transform infrared, scanning electron microscopy, and transmission electron microscopy. Nafion based composite membranes were prepared using SiO₂@TiO₂-palygorskite and TiO₂-palygorskite as a control standard. The composite membranes show improved mechanical properties, thermal stability, water retention, and proton conductivity compared to the neat Nafion membrane. Proton conductivities (at 100°C and 100% relative humidity) increased from 65.0 mS/cm for neat Nafion to 70.4 mS/cm and to 128.6 mS/cm when incorporated TiO₂-Paly (6% in weight) and SiO₂@TiO₂-Paly (6% in weight), respectively.

更新日期：2022-02-05

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