Xu Fei, Chen Yanbo, Lin Bencai, Li Jing, Qiu Ke, Ding Jianning
School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, Jiangsu 213164, China.
Institute of Intelligent Flexible Mechatronics, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
ACS Macro Lett. 2021 Oct 19;10(10):1180-1185. doi: 10.1021/acsmacrolett.1c00506. Epub 2021 Sep 14.
The preparation of anion exchange membranes (AEMs) with excellent chemical and dimensional stability and high conductivity faces several challenges. In the present work, a novel ether-free durable polyfluorene (PF) without fluorine-bearing pendant piperidinium groups was synthesized by the Suzuki cross-coupling reaction. Alkyl groups were introduced into the backbone of PF to enhance the solubility and flexibility of PF-based AEMs, and the transparent and flexible polymer membrane showed a high conductivity of 80.44 mS cm and excellent alkaline stability in 2 M KOH solution at 80 °C. Although the membrane possesses a high ion exchange capacity (IEC) (2.49 mequiv g), it exhibits a low swelling ratio (9.4% at 80 °C), excellent mechanical properties, and dimensional stability. The H/O single cell assembled with PFPE-Pi exhibited a maximum power density of 661 mW cm at a current density of 1280 mA cm at 80 °C. The present work provides a simple and effective strategy for the preparation of ether-free polyfluorene-based AEMs with high conductivity, excellent mechanical properties, and dimensional stability for application in alkaline fuel cells.
制备具有优异化学稳定性、尺寸稳定性和高导电性的阴离子交换膜（AEMs）面临着诸多挑战。在本工作中，通过铃木交叉偶联反应合成了一种新型的无醚耐用聚芴（PF），其不含含氟侧基哌啶鎓基团。将烷基引入PF主链以提高基于PF的AEMs的溶解性和柔韧性，该透明且柔韧的聚合物膜在80℃的2M KOH溶液中显示出80.44 mS cm的高导电性和优异的碱稳定性。尽管该膜具有高离子交换容量（IEC）（2.49 mequiv g），但它具有低溶胀率（80℃时为9.4%）、优异的机械性能和尺寸稳定性。在80℃下，用PFPE-Pi组装的H/O单电池在电流密度为1280 mA cm时表现出661 mW cm的最大功率密度。本工作为制备用于碱性燃料电池的具有高导电性、优异机械性能和尺寸稳定性的无醚聚芴基AEMs提供了一种简单有效的策略。
