Teixeira Fátima C, Teixeira António P S, Rangel Carmen M
Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal.
Departamento de Ciências Médicas e da Saúde, Escola de Saúde e Desenvolvimento Humano & LAQV-REQUIMTE, Instituto de Investigação e Formação Avançada, Universidade de Évora, R. Romão Ramalho, 59, 7000-671 Évora, Portugal.
Polymers (Basel). 2025 Jun 13;17(12):1646. doi: 10.3390/polym17121646.
A decarbonized society demands cleaner and sustainable energy sources based on well-established or emerging technologies with the potential to make a significant contribution to energy storage and conversion, such as batteries, fuel cells and water and/or CO electrolyzers. The performance of these electrochemical devices relies on key components such as their separators/ion-exchange membranes. The most common commercial membrane, Nafion, has several technological limitations. In this study, it is proposed the incorporation of bisphosphonic acid (BP) dopants into membrane matrices to improve their properties. Following this strategy, we prepared new membranes based on sulfonated poly(etheretherketone) (SPEEK) polymer, a reliable and effective alternative membrane polymer, through the incorporation of the BP dopants, to obtain low-cost membranes with improved properties. These membranes were structural, thermal and morphological, characterized by AT-FTIR, TGA and SEM. Their proton conductivity was evaluated over a temperature range between 30 °C and 60 °C, using Electrochemical Impedance Spectroscopy, and their stability during this process was also observed. The best proton conductivity was observed for the SPEEK membrane doped with at 2.0 wt% load at 60 °C, with a proton conduction of 226 mS cm.
脱碳社会需要基于成熟或新兴技术的更清洁、可持续的能源，这些技术有潜力对储能和转换做出重大贡献，如电池、燃料电池以及水和/或CO电解槽。这些电化学装置的性能依赖于关键部件，如它们的隔膜/离子交换膜。最常见的商业膜Nafion有几个技术限制。在本研究中，提出将双膦酸（BP）掺杂剂引入膜基质以改善其性能。按照这一策略，我们通过引入BP掺杂剂，基于磺化聚醚醚酮（SPEEK）聚合物（一种可靠且有效的替代膜聚合物）制备了新型膜，以获得具有改进性能的低成本膜。通过衰减全反射傅里叶变换红外光谱（AT-FTIR）、热重分析（TGA）和扫描电子显微镜（SEM）对这些膜进行了结构、热性能和形态表征。使用电化学阻抗谱在30℃至60℃的温度范围内评估了它们的质子传导率，并在此过程中观察了它们的稳定性。在60℃时，负载量为2.0 wt%的BP掺杂的SPEEK膜观察到最佳质子传导率，质子传导率为226 mS cm。
