离聚物
透氧性
Nafion公司
氧气
聚合物
电解质
化学工程
催化作用
材料科学
氧气输送
电导率
阴极
化学
高分子化学
复合材料
有机化学
电化学
电极
共聚物
物理化学
工程类
作者
Yasir Arafat Hutapea,Masamichi Nishihara,Zulfi Gautama,Albert Mufundirwa,Stephen Matthew Lyth,Takeharu Sugiyama,Mayumi Nagayama,Kazunari Sasaki,Akari Hayashi
标识
DOI:10.1016/j.jpowsour.2022.232500
摘要
Polymer electrolyte fuel cells (PEFCs) have been commercialized as fuel cell vehicles, but high oxygen transport resistance (OTR) needs to be improved for the operation at high current density. OTR is deeply related to oxygen transport to the Pt catalyst through the proton conduction ionomer. In this study, reduction of OTR has simply demonstrated by mixing a high oxygen permeable polymer, poly[1-phenyl-2[p(trimethylsilyl)phenyl]acetylene] (PTMSDPA), and a commercial Nafion® ionomer. Although the resulting blend ionomers have lower proton conductivity than Nafion® itself, they have contributed to increase in PEFC performance in the higher current density region. With small addition of PTMSDPA like 2.5%, local OTR around the Pt catalyst (RPt), is found to decrease as the amount of PTMSDA increases owing to high oxygen permeability of PTMSDPA. However, OTR inside the pore of the catalyst layer (Rpore) rather keeps increasing because of a hydrophilic character of PTMSDPA, leading to oxygen blockage by trapped water. Therefore, only the small amount of addition like 2.5% of PTMSDPA results in the best, and Rpore and Rpt are significantly lowered compared those of Nafion® ionomer by 29% and 43%, respectively, suggesting that utilizing high oxygen permeable polymer is effective for reducing OTR in PEFC.
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