Yang Xiaochen, Feng Zhiming, Alshurafa Mustafa, Yu Ming, Foster Andrew B, Zhai Heng, Yuan Tianmu, Xiao Yiheng, D'Agostino Carmine, Ai Ling, Perez-Page Maria, Smith Keenan, Foglia Fabrizia, Lovett Adam, Miller Thomas S, Chen Jianuo, Budd Peter M, Holmes Stuart M
Department of Chemical Engineering, The University of Manchester, Manchester, M13 9PL, UK.
Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK.
Adv Mater. 2025 May;37(19):e2419534. doi: 10.1002/adma.202419534. Epub 2025 Mar 27.
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) is regarded as a promising energy conversion system owing to simplified water management and enhanced tolerance to fuel impurities. However, phosphoric acid (PA) leaching remains a critical issue, diminishing energy density and durability, posing significant obstacle to the commercial development of HT-PEMFCs. To address this, composite membranes incorporating the carboxylic acid-modified polymer of intrinsic microporosity (cPIM-1) are designed as framework polymer, blended with polyvinylpyrrolidone (PVP) for HT-PEMFCs. The Lewis acid-base interactions between cPIM-1 and PVP created an extensive hydrogen-bonding network, improving membrane compatibility. The optimized microporous structure and multiple anchoring sites gave rise to "domain-limited" PA clusters, enhancing the capillary effect. Simultaneously, improved hydrophobicity synergistically optimizes catalytic interface, promoting continuous and stable proton transfer. The HT-PEMFCs based on PVP/cPIM-1 composite membrane achieved a peak power density of 1090.0 mW cm at 160 °C, representing a 152% improvement compared to PVP/PES membrane. Additionally, it demonstrated excellent durability, with a voltage decay of 0.058 mV h over 210 h of accelerated stress test corresponds to more than 5000 h of constant current density durability test. This study presents a promising strategy for the development of high-performance and durable novel membranes in various energy conversion systems.
高温质子交换膜燃料电池（HT - PEMFCs）因其简化的水管理和对燃料杂质增强的耐受性而被视为一种有前景的能量转换系统。然而，磷酸（PA）浸出仍然是一个关键问题，它会降低能量密度和耐久性，对HT - PEMFCs的商业发展构成重大障碍。为了解决这个问题，设计了将羧酸改性的固有微孔聚合物（cPIM - 1）作为骨架聚合物与聚乙烯吡咯烷酮（PVP）共混的复合膜用于HT - PEMFCs。cPIM - 1与PVP之间的路易斯酸碱相互作用形成了广泛的氢键网络，改善了膜的相容性。优化的微孔结构和多个锚固位点产生了“域限制”的PA簇，增强了毛细作用。同时，改善的疏水性协同优化了催化界面，促进了连续稳定的质子转移。基于PVP/cPIM - 1复合膜的HT - PEMFCs在160°C时实现了1090.0 mW cm的峰值功率密度，与PVP/PES膜相比提高了152%。此外，它还表现出优异的耐久性，在210小时的加速应力测试中电压衰减为0.058 mV h，相当于超过5000小时的恒流密度耐久性测试。这项研究为在各种能量转换系统中开发高性能和耐用的新型膜提出了一种有前景的策略。
