Beneficial use of rotatable-spacer side-chains in alkaline anion exchange membranes for fuel cells†,Energy & Environmental Science

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Beneficial use of rotatable-spacer side-chains in alkaline anion exchange membranes for fuel cells†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-10-09 00:00:00 , DOI: 10.1039/c8ee02071j
Yuan Zhu _{1,

2,

3} , Liang Ding _{1,

2,

3} , Xian Liang _{1,

2,

3} , Muhammad A. Shehzad _{1,

2,

3} , Lianqin Wang _{4,

5,

6} , Xiaolin Ge _{1,

2,

3} , Yubin He _{1,

2,

3} , Liang Wu _{1,

2,

3} , John R. Varcoe _{4,

5,

6} , Tongwen Xu _{1,

2,

3}

Affiliation

Side-chain-type polymer architectures have been extensively studied for development of highly conductive fuel cell membranes. However, the commonly used rigid, hydrophobic spacers (between the ionic end-group and polymer backbone) limit self-assembly of ionic side-chains and, therefore, ion transport. Herein, we report a flexible, hydrophilic side-chain-type anion exchange membrane (AEM), where ethylene oxide spacers are incorporated into imidazolium-containing cationic side-chains. AFM and SAXS analysis confirm that the flexible spacers facilitate self-assembly of the ionic side-chains to form continuous conducting channels. Most importantly, both in situ FTIR spectroscopy and molecular dynamic theory simulations indicate that the ethylene oxide spacers are capable of hydrogen bonding to both H₂O molecules and hydrated OH⁻ ions. This unique auxiliary function facilitates both ion and H₂O transport during fuel cell operation. The resultant AEM exhibits a peak power density of 437 mW cm⁻² at 65 °C when tested in a H₂/O₂ single-cell anion-exchange membrane fuel cell, which is among the highest reported for comparable side-chain-type AEMs.

中文翻译：

燃料电池碱性阴离子交换膜中可旋转间隔物侧链的有益用途†

侧链型聚合物结构已被广泛研究用于开发高导电性燃料电池膜。但是，通常使用的刚性，疏水性间隔基（在离子端基和聚合物主链之间）会限制离子侧链的自组装，从而限制离子传输。在此，我们报道了一种柔性的，亲水性的侧链型阴离子交换膜（AEM），其中环氧乙烷间隔基被掺入到含咪唑鎓的阳离子侧链中。AFM和SAXS分析证实，柔性间隔基可促进离子侧链的自组装，从而形成连续的导电通道。最重要的是，原位FTIR光谱和分子动力学理论模拟均表明，环氧乙烷间隔基能够与两个H ₂氢键合水分子和水合OH ^-离子。这种独特的辅助功能有助于燃料电池运行期间的离子和H ₂ O传输。当在H ₂ / O ₂单电池阴离子交换膜燃料电池中进行测试时，所得的AEM在65°C时表现出437 mW cm ^-2的峰值功率密度，这是同类侧链型报道的最高功率密度之一AEM。

更新日期：2018-10-09

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