Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada.
Angew Chem Int Ed Engl. 2017 Jul 24;56(31):9058-9061. doi: 10.1002/anie.201703916. Epub 2017 Jun 27.
Two classes of novel sulfonated phenylated polyphenylene ionomers are investigated as polyaromatic-based proton exchange membranes. Both types of ionomer possess high ion exchange capacities yet are insoluble in water at elevated temperatures. They exhibit high proton conductivity under both fully hydrated conditions and reduced relative humidity, and are markedly resilient to free radical attack. Fuel cells constructed with membrane-electrode assemblies containing each ionomer membrane yield high in situ proton conductivity and peak power densities that are greater than obtained using Nafion reference membranes. In situ chemical stability accelerated stress tests reveal that this class of the polyaromatic membranes allow significantly lower gas crossover and lower rates of degradation than Nafion benchmark systems. These results point to a promising future for molecularly designed sulfonated phenylated polyphenylenes as proton-conducting media in electrochemical technologies.
两类新型磺化苯并苯基聚芳基离子聚合物被研究作为基于聚芳基的质子交换膜。这两种类型的离子聚合物都具有高的离子交换容量，但在高温下不溶于水。它们在完全水合条件下和降低的相对湿度下都表现出高的质子电导率，并且对自由基攻击具有明显的抵抗力。使用含有每种离子聚合物膜的膜电极组件构造的燃料电池在原位产生高质子电导率和峰值功率密度，大于使用 Nafion 参考膜获得的值。原位化学稳定性加速应力测试表明，与 Nafion 基准系统相比，这类聚芳基膜允许显著更低的气体透过率和更低的降解速率。这些结果表明，在电化学技术中，分子设计的磺化苯并苯基聚芳基作为质子传导介质具有广阔的前景。
