Abstract

Diffusion permeability and electrical conductivity have been studied for bilayer perfluorinated MF-4SC membranes modified with halloysite nanotubes (HNTs) containing noble metal nanoparticles (NPs) deposited onto their surface. It has been found that the diffusion permeability of the bilayer membranes depends on their orientation with respect to an electrolyte flow: the diffusion flux is higher when the modified side of the membrane faces a flow. The study of the electrodiffusion characteristics of HNT-modified bilayer perfluorinated membranes has resulted in the factors being revealed that have the strongest influence on the development of the asymmetry of their current–voltage curves. It has been found that, to obtain a membrane with a fortiori asymmetric properties, it is necessary to synthesize a material the layers of which differ from each other in only one component—either HNTs or metal NPs. The efficiency of the modified membranes as polymer electrolytes for hydrogen-air fuel cells has been determined, and it has been shown that the modification with HNTs reduces the specific power of a fuel cell, while the presence of platinum NPs on a nanotube surface increases this parameter. The reason for the increase in the specific power is the catalytic activity of platinum NPs in the interaction between oxygen and hydrogen in the membrane bulk, which leads to the self-humidifying of the membrane and a decrease in its ohmic resistance.

中文翻译：

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埃洛石修饰的双层膜的电扩散特性

摘要

已经研究了用含有沉积在其表面上的贵金属纳米颗粒（NP）的埃洛石纳米管（HNT）改性的双层全氟化MF-4SC膜的扩散渗透性和电导率。已经发现双层膜的扩散渗透性取决于它们相对于电解质流的取向：当膜的改性侧面对流时，扩散通量更高。对HNT改性的双层全氟化膜的电扩散特性的研究表明，这些因素对其电流-电压曲线的不对称性的发展影响最大。已经发现，为了获得具有fortiori不对称特性的膜，有必要合成一种材料，这些材料的层仅在一种组分（HNT或金属NP）中彼此不同。已经确定了改性膜作为氢-空气燃料电池的聚合物电解质的效率，并且已经表明，用HNTs进行改性会降低燃料电池的比功率，而纳米管表面上铂NP的存在会增加这种效率。参数。比功率增加的原因是铂NP在膜主体中的氧与氢之间的相互作用中具有催化活性，这导致膜的自增湿和其欧姆电阻的降低。并且已经表明，用HNT修饰会降低燃料电池的比功率，而在纳米管表面上存在铂NP会增加该参数。比功率增加的原因是铂NP在膜主体中的氧与氢之间的相互作用中具有催化活性，这导致膜的自增湿和其欧姆电阻的降低。并且已经表明，用HNT修饰会降低燃料电池的比功率，而在纳米管表面上存在铂NP会增加该参数。比功率增加的原因是铂NP在膜主体中的氧与氢之间的相互作用中具有催化活性，这导致膜的自增湿和其欧姆电阻的降低。