De Novo Design of Aminopropyl Quaternary Ammonium-Functionalized Covalent Organic Frameworks for Enhanced Polybenzimidazole Anion Exchange Membranes

被引:1
|
作者
Chen, Wanting [1 ]
Liu, Qiang [2 ]
Pang, Bo [1 ]
Cui, Fujun [3 ]
Wang, Leilei [1 ]
Zhou, Fengpu [1 ]
He, Gaohong [1 ,3 ,4 ,5 ]
Wu, Xuemei [1 ,4 ]
机构
[1] Dalian Univ Technol, Frontier Sci Ctr Smart Mat, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
[2] Wanhua Chem Fujian Isocyanate Co Ltd, Fuzhou 350000, Peoples R China
[3] Dalian Univ Technol, Panjin Inst Ind Technol, Panjin 124221, Peoples R China
[4] Dalian Univ Technol, Sch Chem Engn Ocean & Life Sci, Panjin 124221, Peoples R China
[5] Liaoning Binhai Lab, Dalian 116023, Peoples R China
基金
中国国家自然科学基金;
关键词
anion exchange membranes; covalent organic frameworks; fuel cells; ionic channels; polybenzimidazole;
D O I
10.1002/smll.202407260
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Quaternary ammonium functionalized covalent organic frameworks (COFs) have great potential to enhance hydroxide transport owing to crystalline ordered 1D nanochannels, however, suffer from limited quaternary ammonium functional monomers and poor membrane-forming ability. In this work, a novel aminopropyl quaternary ammonium-functionalized COF (DCOF) is designed and synthesized via a bottom-up strategy. The self-supporting DCOF membrane exhibits high crystallinity with a dense and orderly arrangement of quaternary ammonium groups (IEC, 2.07 mmol g-1), achieving a high hydroxide conductivity of 172.5 mS cm-1 and an extremely low water swelling of 5.3% at 80 degrees C. The exfoliated DCOF colloidal suspension is further incorporated into quaternary ammonium di-cation grafted polybenzimidazoles (DPBI) matrix. Molecular simulations reveal strong electrostatic and van der Waals interfacial interactions between DCOF and DPBI, which enable a high doping content of 20 wt.% and interconnected ionic channels through the surface and nanochannels of the DCOF. The DCOF/DPBI-20% membrane exhibits a tensile strength of 29.7 MPa, a hydroxide conductivity of 135.3 mS cm-1, and a low swelling ratio of 37.2% at 80 degrees C. A H2/O2 single cell assembled with the membrane reaches a peak power density of 323 mW cm-2, surpassing most recently reported COF-based membranes.
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页数:10
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