质子交换膜燃料电池
膜
磷酸
耐久性
扫描电子显微镜
材料科学
化学工程
膜电极组件
多孔性
电导率
电解质
化学
电极
复合材料
工程类
物理化学
冶金
生物化学
作者
Li‐Cheng Jheng,Wesley Jen-Yang Chang,Steve Lien‐Chung Hsu,Po-Yang Cheng
标识
DOI:10.1016/j.jpowsour.2016.05.043
摘要
Two types of porous polybenzimidazole (PBI) membranes with symmetric and asymmetric morphologies were fabricated by the template-leaching method and characterized by scanning electron microscope (SEM). Their physicochemical properties were compared in terms of acid-doping level, proton conductivity, mechanical strength, and oxidative stability. The durability of fuel cell operation is one of the most challenging for the PBI based membrane electrode assembly (MEA) used in high-temperature proton exchange membrane fuel cells (HT-PEMFCs). In the present work, we carried out a long-term steady-state fuel cell test to compare the effect of membrane structure on the cell voltage degradation. It has also been demonstrated that the asymmetrically porous PBI could bring some notable improvements on the durability of fuel cell operation, the fuel crossover problem, and the phosphoric acid leakage.
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