电导率
铋
电解质
材料科学
化学工程
多孔性
质子交换膜燃料电池
复合数
化学稳定性
质子
膦酸盐
聚砜
金属有机骨架
复合材料
聚合物
化学
有机化学
电极
物理化学
燃料电池
冶金
吸附
工程类
物理
量子力学
作者
Pablo Salcedo‐Abraira,Catalina Biglione,Sérgio M. F. Vilela,Erik Svensson Grape,Nieves Ureña,Fabrice Salles,María Teresa Pérez‐Prior,Tom Willhammar,Philippe Trens,A. Várez,A. Ken Inge,Patricia Horcajada
标识
DOI:10.1021/acs.chemmater.3c00387
摘要
Despite the interest in proton exchange membrane (PEM) technologies (fuel cells and electrolyzers) for energy applications, the low stability of the electrolyte materials under working conditions (i.e., humidity and temperature) is one of their major limitations. Metal–organic frameworks (MOFs) have recently emerged as promising electrolytes due to their higher stability compared with the currently applied organic polymers, proton conductivity, and outstanding porosity. Here, a novel robust Bi phosphonate MOF (branded as IEF-7) was successfully synthesized and fully characterized, exhibiting an unusual topology due to the irregular coordination geometry of the bismuth cations. Furthermore, IEF-7 exhibited potential porosity, very high chemical and thermal stability, and free −PO3H groups involved in its ultrahigh proton conductivity, reaching 1.39 × 10–2 S cm–1 at 90 °C and 90% relative humidity for, at least, 3 cycles. In order to improve the consolidation and shaping of the powder for testing its ion conductivity properties, a highly MOF-loaded composite (90 wt %) was prepared by adding a proton conductive sulfonated polysulfone binder. The proton conductivity of the resulting composite was in the same order of magnitude as the compacted MOF powder, making this polymeric composite electrolyte very promising for PEM technologies.
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