High Performance Anion Exchange Membrane Fuel Cells Enabled by Fluoropoly(olefin) Membranes
High Performance Anion Exchange Membrane Fuel Cells Enabled by Fluoropoly(olefin) Membranes
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DOI：
10.1002/adfm.201902059
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发表时间：
2019-05
影响因子：
19
通讯作者：
Liang Zhu;Xiong Peng;S. Shang;Michael T. Kwasny;Tawanda J. Zimudzi;Xuedi Yu;Nayan Saikia;Jinghao Pa
中科院分区：
文献类型：
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作者：
Liang Zhu;Xiong Peng;S. Shang;Michael T. Kwasny;Tawanda J. Zimudzi;Xuedi Yu;Nayan Saikia;Jinghao Pa
尽管在过去的十年中，阴离子交换膜燃料电池（AEMFC）的峰值功率密度已从1.01 W cm-2提高到1.4W cm-2，但文献中报道的大多数AEMFC尚未被证明能够实现一致的高性能和稳态运行。与不含氟的样品相比，在芳族共聚单体上具有氟取代的基于聚（烯烃）的AEM显示出相当高的尺寸稳定性。更重要的是，基于氟化聚烯烃的AEM表现出高氢氧化物电导率，而没有过度水合，这是由于一种新提出的机制，其中氟化偶极单体促进氢氧化物解离和传输增加。使用这种新一代AEMs，稳定、高性能的AEMFC可运行120小时。当燃料电池配置在H2/O2流下经受600 mA cm-2的恒定电流密度时，电池电压在磨合期间的前20 h仅下降11%（从0.75 V下降到0.67 V），并且在随后的100 h电池测试中电池电压损失很低（0.2 mV h-1）。合成的容易性，低成本商业化的潜力，以及基于氟聚（烯烃）的AEM的显着的非原位性能和原位性能，使这种材料成为实际AEMFC应用的基准膜。
Although the peak power density of anion exchange membrane fuel cells (AEMFCs) has been raised from ≈0.1 to ≈1.4 W cm−2 over the last decade, a majority of AEMFCs reported in the literature have not been demonstrated to achieve consistently high performance and steady‐state operation. Poly(olefin)‐based AEMs with fluorine substitution on the aromatic comonomer show considerably higher dimensional stability compared to samples that do not contain fluorine. More importantly, fluorinated poly(olefin)‐based AEMs exhibit high hydroxide conductivity without excessive hydration due to a new proposed mechanism where the fluorinated dipolar monomer facilitates increased hydroxide dissociation and transport. Using this new generation of AEMs, a stable, high‐performance AEMFC is operated for 120 h. When the fuel cell configuration is subjected to a constant current density of 600 mA cm−2 under H2/O2 flow, the cell voltage declines only 11% (from 0.75 to 0.67 V) for the first 20 h during break‐in and the cell voltage loss is low (0.2 mV h−1) over the subsequent 100 h of cell testing. The ease of synthesis, potential for low‐cost commercialization, and remarkable ex situ properties and in situ performance of fluoropoly(olefin)‐based AEM renders this material a benchmark membrane for practical AEMFC applications.