Chemical Stability of Hybrid Materials Based on Nafion® Membrane and Hydrated Oxides

IF 2 Q4 CHEMISTRY, PHYSICAL Membranes and Membrane Technologies Pub Date : 2022-12-26 DOI:10.1134/S2517751622060087

E. Yu. Safronova, O. V. Korchagin, V. A. Bogdanovskaya, A. B. Yaroslavtsev

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引用次数: 2

Abstract

Improvement of the chemical stability of hybrid membranes based on perfluorosulfonic acid polymers is necessary to increase the lifetime of fuel cells. This article presents the results of the study of the transport properties and chemical stability of the hybrid Nafion® 212 membranes modified with nanoparticles of hydrated oxides SiO₂, ZrO₂, and TiO₂ by in situ procedure. The influence of the nature of the dopant on the properties of the obtained materials is shown. The chemical degradation of the initial and hybrid membranes has been studied ex situ by treatment with Fenton’s reagent for 240 hours. The stability of materials increases in the series Nafion + SiO₂ < Nafion + ZrO₂ < Nafion < Nafion + TiO₂. For the Nafion + TiO₂ membrane the change in mass as a result of treatment with Fenton’s reagent is two times lower than for the initial Nafion membrane. This reveals an increase in the chemical stability of materials upon the incorporation of TiO₂ nanoparticles due to their ability to bind free radicals. The maximum power of membrane-electrode assembly based on hybrid membranes containing TiO₂ and SiO₂ is higher than that based on Nafion® 212 by 7–10% at RH ~ 100% and t = 65°C.

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基于Nafion®膜和水合氧化物的杂化材料的化学稳定性

提高全氟磺酸聚合物杂化膜的化学稳定性是提高燃料电池使用寿命的必要条件。本文介绍了用水合氧化物SiO2、ZrO2和TiO2纳米颗粒原位修饰的Nafion®212杂化膜的传输特性和化学稳定性的研究结果。说明了掺杂剂的性质对所得材料性能的影响。用Fenton试剂处理240小时，研究了初始膜和杂化膜的化学降解。naion + SiO2 <系列材料的稳定性提高;Nafion + ZrO2 <全氟磺酸& lt;Nafion + TiO2。对于Nafion + TiO2膜，Fenton试剂处理后的质量变化是初始Nafion膜的两倍。这表明，由于TiO2纳米颗粒结合自由基的能力，材料的化学稳定性得到了提高。在RH ~ 100%，温度为65℃时，TiO2和SiO2杂化膜的最大功率比Nafion®212膜的最大功率高7-10%。

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来源期刊

Membranes and Membrane Technologies Multiple-

CiteScore

3.10

自引率

31.20%

发文量

期刊介绍： The journal Membranes and Membrane Technologies publishes original research articles and reviews devoted to scientific research and technological advancements in the field of membranes and membrane technologies, including the following main topics:novel membrane materials and creation of highly efficient polymeric and inorganic membranes;hybrid membranes, nanocomposites, and nanostructured membranes;aqueous and nonaqueous filtration processes (micro-, ultra-, and nanofiltration; reverse osmosis);gas separation;electromembrane processes and fuel cells;membrane pervaporation and membrane distillation;membrane catalysis and membrane reactors;water desalination and wastewater treatment;hybrid membrane processes;membrane sensors;membrane extraction and membrane emulsification;mathematical simulation of porous structures and membrane separation processes;membrane characterization;membrane technologies in industry (energy, mineral extraction, pharmaceutics and medicine, chemistry and petroleum chemistry, food industry, and others);membranes and protection of environment (“green chemistry”).The journal has been published in Russian already for several years, English translations of the content used to be integrated in the journal Petroleum Chemistry. This journal is a split off with additional topics.