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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synthesis and Characterization of a Self-Assembled Nafion/Silica Nanocomposite Membrane for Polymer Electrolyte Membrane Fuel Cells
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Synthesis and Characterization of a Self-Assembled Nafion/Silica Nanocomposite Membrane for Polymer Electrolyte Membrane Fuel Cells

机译：用于聚合物电解质膜燃料电池的自组装Nafion /二氧化硅纳米复合膜的合成与表征

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摘要

A novel Nafion/SiO2 nanocomposite membrane has been developed by combining the self-assembly route and Nafion/SiO2 hybrids. Nafion-stabilized SiO2 nanoparticles were synthesized by using the self-assembly route. The hydrolysis procedure has significant influence on the size and distribution of SiO2 nanoparticles and the quality and performance of the composite membranes. Best results were obtained on the Nafion/SiO2 composite membrane recast from Nation—SiO2 (5 wt %) nanoparticles with a H2O:TEOS ratio of 4:1. The Nafion/SiO2 composite membrane prepared by the self-assembled Nafion-SiO2 nanoparticles shows remarkable durability as compared to the Nafion/SiO2 composite membrane prepared by the conventional sol—gel method and pure Nation 212 membrane, most likely due to the intimate interface between the self-assembled Nafion-SiO2 nanoparticles and Nafion polymeric matrix. The tensile strength and proton conductivity of the self-assembled Nafion/SiO2nanocomposite membranes are 27.5 MPa and 0.090 S/cm, respectively, close to that of the pure Nation 212 membrane. The λH2O/SO3H of the self-assembled Nafion/SiO2 composite membrane at 60 °C is 7.02, ～5 times higher than 1.33 of the Nafn 212 membrane. Very different from the pure Nation 212 membrane, the PEM fuel cells assembled with a self-assembled Nafion/SiO2 nanocomposite membrane show good performance and negligible performance decay when the RH of the inlet gases changes from 100% to 50% under a constant current load of 600 mA cm~(-260 °C. This work demonstrates the promising potential of the self-assembled Nafion/SiO2 composite membranes for the development of high-performance and high-stability PEM fuel cells with high tolerance to RH variations at elevated high temperatures.
机译：通过结合自组装路线和Nafion / SiO2杂化物，开发了一种新型的Nafion / SiO2纳米复合膜。利用自组装路线合成了Nafion稳定的SiO2纳米粒子。水解过程对SiO2纳米颗粒的尺寸和分布以及复合膜的质量和性能有重要影响。从Nation-SiO2（5 wt％）纳米颗粒以H2O：TEOS比为4：1重铸的Nafion / SiO2复合膜获得了最佳结果。与通过常规溶胶-凝胶法和纯Nation 212膜制备的Nafion / SiO2复合膜相比，通过自组装Nafion-SiO2纳米颗粒制备的Nafion / SiO2复合膜显示出显着的耐久性，这很可能是由于两者之间的紧密界面自组装的Nafion-SiO2纳米颗粒和Nafion聚合物基体。自组装的Nafion / SiO2纳米复合膜的拉伸强度和质子电导率分别接近纯Nation 212膜的拉伸强度和质子传导率，分别为27.5 MPa和0.090 S / cm。自组装的Nafion / SiO2复合膜在60°C时的λH2O/ SO3H为7.02，比Nafn 212膜的1.33高约5倍。与纯Nation 212膜完全不同，用自组装的Nafion / SiO2纳米复合膜组装的PEM燃料电池在恒定电流负载下，当进气的RH从100％变为50％时，表现出良好的性能，而性能衰减可忽略不计600 mA cm〜（-260°C）。这项工作证明了自组装的Nafion / SiO2复合膜在开发高性能和高稳定性PEM燃料电池方面具有广阔的潜力，该燃料电池在高温下对RH变化具有较高的耐受性温度。

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