质子交换膜燃料电池
膜
化学工程
三联烯
催化作用
材料科学
化学
扩散
燃料电池
巴勒
磷酸
磁导率
高分子化学
有机化学
热力学
生物化学
物理
工程类
作者
Qing Ju,Hongying Tang,Hao Dong,Kang Geng,Huidong Qian,Xiaohua Ma,Nanwen Li
标识
DOI:10.1016/j.memsci.2023.121788
摘要
Phosphoric species' toxicity to Pt catalyst has shown a significant impact on the kinetics of the oxygen reduction reaction (ORR) in high-temperature proton exchange membrane fuel cells (HT-PEMFCs), which hinders the technology's commercial potential. Herein, a novel triptycene-based polybenzimidazole (Trip-PBI) was obtained for the first time, and employed as a PEM or binder material for HT-PEMFC. The Trip-PBI membrane outperformed the m-PBI membrane in terms of oxygen permeability at 150 °C (18.6 vs 3.7 Barrer), and the gas diffusion electrodes (GDE) using Trip-PBI as a binder displayed moderate hydrophilicity (PA contact angle: 28°). This successfully addresses the issues of gas transfer restriction and excessive PA diffusion in the PEM to the catalysis layer. As a result, at 160 °C, the MEA using Trip-PBI as the binder exhibits the maximum PPD of 700 mW/cm2, which is 1.84 times that of m-PBI and 1.36 times that of PTFE. Moreover, the H2/O2 cell using Trip-PBI binder also exhibits good stability for 100 h at 160 °C with 0.3 A/cm2 current density.
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