Reduction of oxygen transport resistance in PEFC cathode through blending a high oxygen permeable polymer

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
出处
期刊:Journal of Power Sources [Elsevier]
卷期号:556: 232500-232500 被引量:10
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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