聚苯乙烯离聚体膜在PEFC中的湿/干循环耐久性

IF 5.4 Q2 CHEMISTRY, PHYSICAL
Toshiki Tanaka , Haruhiko Shintani , Yasushi Sugawara , Akihiro Masuda , Nobuyuki Sato , Makoto Uchida , Kenji Miyatake
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引用次数: 4

摘要

根据美国能源部(US-DOE)的协议,在燃料电池的湿/干循环测试中评估了我们的碳氢聚合物电解质膜(聚(亚砜-醌-苯炔)(SPP-QP)或聚苯离聚物的机械耐久性,其中研究了气体扩散层(硬或软GDL)的影响。经过4000次循环后,膜表现出机械失效,硬GDL和H2交叉(通过膜的渗透率)从0.01%跃升至约2%。测试后分析表明,衬垫下的膜边缘受损最严重,在加湿/除湿时尺寸变化受到限制。使用软GDL显著提高了膜的湿/干循环耐久性,即使在3万次循环后,H2交叉也没有实际变化,因为GDL与催化剂层的粘附性很强。SPP-QP膜的机械耐久性优于我们之前在主链上含有醚和酮基团的芳香族离聚体膜。SPP-QP膜的分子量和磺酸基损失较小,表明该膜在严重干湿循环条件下具有化学稳健性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Wet/dry cycle durability of polyphenylene ionomer membranes in PEFC

The mechanical durability of our hydrocarbon polymer electrolyte membrane, poly(sulfophenylene quinquephenylene) (SPP-QP) or polyphenylene ionomer, was evaluated in wet/dry cycle tests in fuel cells according to the US-DOE protocol, where the effect of gas diffusion layers (hard or soft GDL) was investigated. The membrane exhibited mechanical failure with the hard GDL and H2 crossover (permeation through the membrane) jumping from 0.01% to ca. 2% after 4,000 cycles. Post-test analyses indicated that the edge of the membrane under the gasket was the most damaged, where the dimensional change upon humidification/dehumidification was restricted. Use of the soft GDL significantly improved the wet/dry cycle durability of the membrane with no practical changes in the H2 crossover, even after 30,000 cycles, due to the strong adhesion of the GDL to the catalyst layers. The mechanical durability of the SPP-QP membrane was better than that of our previous aromatic-based ionomer membrane containing ether and ketone groups in the main chain. The loss of molecular weight and the sulfonic acid groups was rather minor for the SPP-QP membrane, indicating chemical robustness of the membrane under the severe wet/dry cycle conditions.

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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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