新一代钠离子膜:与磺化硅质层状材料(sSLM)协同增强电化学性能和热机械稳定性。

IF 4.7 3区 工程技术 Q1 POLYMER SCIENCE
Polymers Pub Date : 2025-07-03 DOI:10.3390/polym17131866
Valeria Loise, Cataldo Simari
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引用次数: 0

摘要

Nafion作为燃料电池质子交换膜(PEM)的基准材料,在高温和低湿度条件下,由于脱水和机械稳定性降低,其性能会显著下降。为了解决这些限制,本研究研究了含有磺化二氧化硅层状材料(sSLMs)的Nafion纳米复合膜的开发和表征。利用sslm固有的层状结构、高表面积和丰富的磺酸功能来协同增强膜的性能。我们的研究结果表明,掺入sSLM显著提高了离子交换能力、吸水率和尺寸稳定性,从而在高温下具有更好的保水和自扩散能力。关键是,纳米复合膜表现出显著增强的质子导电性,特别是在120℃和低相对湿度(即20% RH)的苛刻条件下,无填料的Nafion基本上停止导电。单个H2/O2燃料电池测试证实了这些增强,在120℃和20% RH下,最佳sSLM-Nafion纳米复合膜(N-sSLM5)的功率密度比原始Nafion提高了两倍(340 mW cm-2,而Nafion为117 mW cm-2)。这些发现强调了sSLM作为功能性填料的巨大潜力,可用于制造坚固、高性能的PEMs,为下一代燃料电池在更具挑战性的环境条件下高效运行铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Next-Generation Nafion Membranes: Synergistic Enhancement of Electrochemical Performance and Thermomechanical Stability with Sulfonated Siliceous Layered Material (sSLM).

Nafion, while a benchmark proton exchange membrane (PEM) for fuel cells, suffers from significant performance degradation at elevated temperatures and low humidity due to dehydration and diminished mechanical stability. To address these limitations, this study investigated the development and characterization of Nafion nanocomposite membranes incorporating sulfonated silica layered materials (sSLMs). The inherent lamellar structure, high surface area, and abundant sulfonic acid functionalities of sSLMs were leveraged to synergistically enhance membrane properties. Our results demonstrate that sSLM incorporation significantly improved ion exchange capacity, water uptake, and dimensional stability, leading to superior water retention and self-diffusion at higher temperatures. Critically, the nanocomposite membranes exhibited remarkably enhanced proton conductivity, particularly under demanding conditions of 120 C and low relative humidity (i.e., 20% RH), where filler-free Nafion largely ceases to conduct. Single H2/O2 fuel cell tests confirmed these enhancements, with the optimal sSLM-Nafion nanocomposite membrane (N-sSLM5) achieving a two-fold power density improvement over pristine Nafion at 120 C and 20% RH (340 mW cm-2 vs. 117 mW cm-2 for Nafion). These findings underscore the immense potential of sSLM as a functional filler for fabricating robust and high-performance PEMs, paving the way for the next generation of fuel cells capable of operating efficiently under more challenging environmental conditions.

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来源期刊
Polymers
Polymers POLYMER SCIENCE-
CiteScore
8.00
自引率
16.00%
发文量
4697
审稿时长
1.3 months
期刊介绍: Polymers (ISSN 2073-4360) is an international, open access journal of polymer science. It publishes research papers, short communications and review papers. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Polymers provides an interdisciplinary forum for publishing papers which advance the fields of (i) polymerization methods, (ii) theory, simulation, and modeling, (iii) understanding of new physical phenomena, (iv) advances in characterization techniques, and (v) harnessing of self-assembly and biological strategies for producing complex multifunctional structures.
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