A new high temperature polymer electrolyte membrane based on trifunctional group grafted polysulfone for fuel cell application
A new high temperature polymer electrolyte membrane based on trifunctional group grafted polysulfone for fuel cell application
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一种基于三官能团接枝聚砜的新型燃料电池高温聚合物电解质膜
DOI：
10.1016/j.memsci.2018.11.035
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发表时间：
2019
影响因子：
9.5
通讯作者：
Lu Shanfu
中科院分区：
文献类型：
--
作者：
Zhang Jujia;Zhang Jin;Bai Huijuan;Tan Qinglong;Wang Haining;He Baoshan;Xiang Yan;Lu Shanfu
高温聚合物电解质膜（HT-PEMs）应用的一个关键问题是在其质子电导率和机械强度之间取得良好的平衡。本研究提出了一种新的策略，通过增加聚砜侧链接枝上官能团的数量来达到平衡。将具有三个叔胺基团的2,4,6-三（二甲氨基甲基）-苯酚（TDAP）接枝在PSU （TDAP-PSU）上，以较低的接枝度获得较高的磷酸（PA）吸收率。此外，与单叔胺基接枝的PSU膜（DMA-PSU）相比，一个接枝位点的胺束减少了体积膨胀。由此可见，75%接枝度的TDAP-PSU膜与99%接枝度的DMA-PSU膜的PA吸收率相当，而PA掺杂后的TDAP-PSU膜的机械强度是后者的2.2倍。此外，基于TDAP-PSU膜的单个电池的峰值功率密度达到453 mW cm−2，并且在没有外部加湿的情况下具有出色的稳定性。总的来说，增加聚合物侧链接枝部位的活性基团数量是解决HT-PEMs的质子电导率和膜尺寸稳定性之间权衡的一种很有前途的策略。
One critical issue for the application of high-temperature polymer electrolyte membranes (HT-PEMs) is to obtain good balance between their proton conductivities and mechanical strength. In this work, a novel strategy has been developed to achieve the balance by increasing the number of functional groups in the grafting site of the side chain of polysulfone (PSU). 2,4,6-tri(dimethylaminomethyl)-phenol (TDAP) with three tertiary amine groups was grafted on PSU (TDAP-PSU) to achieve higher phosphoric acid (PA) uptake at a lower grafting degree. Moreover, the bundle of amine groups in one grafting site reduces the volume swelling compared to the single tertiary amine group grafted PSU membrane (DMA-PSU). Thereby, the TDAP-PSU membrane with 75% grafting degree achieves comparable PA uptake with the DMA-PSU membrane with 99% grafting degree, whereas the mechanical strength of former membrane after PA doping is 2.2 times higher than that of the later one after PA doping. Moreover, single cells based on the TDAP-PSU membrane reach the peak power density of 453 mW cm−2and excellent stability without external humidification. Overall, increasing the number of active groups in the grafting site of the polymer side chain is a promising strategy to deal with the trade-off between the proton conductivity and membrane dimensional stability of HT-PEMs.