Quaternized Branched Polyethyleneimine Modified Nitrogen-Doped Graphene Quantum Dots/Quaternized Polysulfone Composite Anion Exchange Membranes with Improved Performance
Quaternized Branched Polyethyleneimine Modified Nitrogen-Doped Graphene Quantum Dots/Quaternized Polysulfone Composite Anion Exchange Membranes with Improved Performance
复制标题
性能改进的季铵化支化聚乙烯亚胺改性氮掺杂石墨烯量子点/季铵化聚砜复合阴离子交换膜
DOI：
10.1002/mame.202100787
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发表时间：
2022-01-28
影响因子：
3.9
通讯作者：
Fan, Minmin
中科院分区：
文献类型：
--
作者：
Dong, Dawei;Zhang, Minghua;Fan, Minmin
阴离子交换膜（AEM）是碱性阴离子交换膜燃料电池发展的关键，其性能在很大程度上取决于其内部的微观结构。为了提高AEM的性能，将季铵化支化聚乙烯亚胺改性氮掺杂石墨烯量子点（QBPEI@ N-GQD）引入到季铵化聚砜（QPSU）聚合物基体中，制备了一系列QPSU/QBPEI@ N-GQD（QQ-n-N-GQD）复合AEM。由于亲水性QBPEI@N-GQDs的均匀分布，在QQ-n-N-GQDs复合AEM内部形成了明显的亲水/疏水微相分离结构。与原始QPSU AEM相比，QQ-0.7%-N-GQDs AEM显示出略高的吸水率（WU）和溶胀比（SR），以及更高的离子传导率（QQ-0.7%-N-GQD AEM在80摄氏度下为76.18 mS cm（-1），而原始QPSU AEM在80摄氏度下为46.14 mS cm（-1））和更好的单燃料电池最大功率密度（对于QQ-0.7%-N-GQD AEM为85.2 mW cm（-2），对于QPSU AEM为46.3 mW cm（-2））。此外，QQ-n-N-GQD复合AEM的化学稳定性没有受到QBPEI@ N-GQD的引入的显著不利影响。
Anion exchange membrane (AEM) is essential for the development of alkaline anion exchange membrane fuel cells, and its performance largely depends on its internal microstructure. Herein, to improve the performance of AEM, quaternized branched polyethyleneimine modified nitrogen-doped graphene quantum dots (QBPEI@N-GQDs) are introduced to quaternized polysulfone (QPSU) polymer matrix to prepare a series of QPSU/QBPEI@N-GQDs (QQ-n-N-GQDs) composite AEMs. Due to the uniform distribution of hydrophilic QBPEI@N-GQDs, an obvious hydrophilic/hydrophobic microphase separation structure is formed inside the QQ-n-N-GQDs composite AEMs. Compared with the pristine QPSU AEM, the QQ-0.7%-N-GQDs AEM shows slightly higher water uptake (WU) and swelling ratio (SR), as well as much higher ionic conductivity (76.18 mS cm(-1) at 80 degrees C for QQ-0.7%-N-GQDs AEM versus 46.14 mS cm(-1) at 80 degrees C for pristine QPSU AEM) and better maximum power density of single fuel cell (85.2 mW cm(-2) for QQ-0.7%-N-GQDs AEM versus 46.3 mW cm(-2) for QPSU AEM). Moreover, the chemical stability of QQ-n-N-GQDs composite AEMs has not been significantly adversely affected by the introduction of QBPEI@N-GQDs.