Guiding the self-assembly of hyperbranched anion exchange membranes utilized in alkaline fuel cells
Guiding the self-assembly of hyperbranched anion exchange membranes utilized in alkaline fuel cells
复制标题
指导碱性燃料电池中使用的超支化阴离子交换膜的自组装
DOI：
10.1016/j.memsci.2018.12.049
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发表时间：
2019-03-01
影响因子：
9.5
通讯作者：
Xu, Tongwen
中科院分区：
文献类型：
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作者：
Ge, Qianqian;Liang, Xian;Xu, Tongwen
阴离子交换膜燃料电池（AEMFC）可以在高pH值下有效地将化学能转化为电能。然而，作为关键部件，现有的阴离子交换膜（AEM）无法同时具有传统线性 AEM 所固有的高稳定性和高电导率。为了解决这个问题，我们在这里报道了通过二胺交联的超支化AEM，并提出了一种指导超支化AEM自组装的策略，从而调节膜微相形态。我们发现二胺交联剂的链长在引导超支化 AEM 内微相分离形态的形成方面发挥着重要作用，并最终影响膜的电导率和稳定性。超支化膜 HBM-6C 表现出最独特的微相分离形态，从而具有高电导率和改善的碱性稳定性。例如，HBM-6C膜在30℃时的氢氧化物电导率为27.18 mS cm(-1)，是线性对应膜[PTMVPMA][OH](10 mS cm(-1))的2.7倍。与HBM-6C膜组装的H-2/O-2 AEMFC在190 mA cm(-2)的电流密度下表现出97 mW cm(-2)的最大功率密度。我们的结果将为具有新颖链架构的 AEM 铺平道路，并刺激 AEMFC 性能的进一步提高。
Anion exchange membrane fuel cells (AEMFCs) can efficiently convert chemical energy into electricity at high pH. However, as the critical component, the existing anion exchange membranes (AEMs), cannot have both high stability and high conductivity, which is intrinsic to the conventional linear AEMs. To address this, here we report hyperbranched AEMs cross-linked by diamines and proposed a strategy to guide the self-assembly of hyperbranched AEMs, thereby regulating the membrane microphase morphology. We found that the chain length of the diamine cross-linking agents plays a significant role in guiding the formation of microphase separated morphology inside hyperbranched AEMs and influences eventually the membrane conductivity and stability. The hyperbranched membrane HBM-6C exhibits the most distinct microphase separated morphology, leading to high conductivity and improved alkaline stability. For instance, the hydroxide conductivity of HBM-6C membrane is 27.18 mS cm(-1) at 30 degrees C, 2.7 times of the linear counterpart membrane [PTMVPMA][OH] (10 mS cm(-1)). A H-2/O-2 AEMFC assembled with HBM-6C membrane herein demonstrates a maximum power density of 97 mW cm(-2) at a current density of 190 mA cm(-2). Our results would pave the way towards AEMs with novel chain architecture and stimulate further improvement in AEMFC performance.