膜
材料科学
质子交换膜燃料电池
磷酸
化学工程
质子输运
质子化
化学
有机化学
离子
生物化学
工程类
冶金
作者
Liying Wang,Yuliang Wang,Zhangnan Li,Tianyang Li,Ruyu Zhang,Jing Li,Baijun Liu,Zhongyuan Lv,Weiwei Cai,Shuhui Sun,Wei Hu,Yunfeng Lu,Guangshan Zhu
标识
DOI:10.1002/adma.202303535
摘要
High-temperature proton-exchange-membrane fuel cells (HT-PEMFCs) can offer improved energy efficiency and tolerance to fuel/air impurities. The high expense of the high-temperature proton-exchange membranes (HT-PEMs) and their low durability at high temperature still impede their further practical applications. In this work, a phosphoric acid (PA)-doped porous aromatic framework (PAF-6-PA) is incorporated into poly[2,2'-(p-oxydiphenylene)-5,5'-benzimidazole] (OPBI) to fabricate novel PAF-6-PA/OPBI composite HT-PEMs through solution-casting. The alkaline nitrogen structure in PAF-6 can be protonated with PA to provide proton hopping sites, and its porous structure can enhance the PA retention in the membranes, thus creating fast pathways for proton transfer. The hydrogen bond interaction between the rigid PAF-6 and OPBI can also enhance the mechanical properties and chemical stability of the composite membranes. Consequently, PAF-6-PA/OPBI exhibits an optimal proton conductivity of 0.089 S cm-1 at 200 °C, and peak power density of 437.7 mW cm-2 (Pt: 0.3 mg cm-2 ), which is significantly higher than that of the OPBI. The PAF-6-PA/OPBI provides a novel strategy for the practical application of PBI-based HT-PEMs.
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