Highly conductive and robust composite anion exchange membranes by incorporating quaternized MIL-101(Cr)

Xueyi He; Mingyue Gang; Zhen Li; Guangwei He; Yongheng Yin; Li Cao; Bei Zhang; Hong Wu; Zhongyi Jiang

doi:10.1016/j.scib.2017.01.022

Highly conductive and robust composite anion exchange membranes by incorporating quaternized MIL-101(Cr)

Sci Bull (Beijing). 2017 Feb 28;62(4):266-276. doi: 10.1016/j.scib.2017.01.022. Epub 2017 Jan 19.

Authors

Xueyi He¹, Mingyue Gang¹, Zhen Li², Guangwei He¹, Yongheng Yin¹, Li Cao¹, Bei Zhang¹, Hong Wu¹, Zhongyi Jiang³

Affiliations

¹ Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
² Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
³ Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China. Electronic address: zhyjiang@tju.edu.cn.

PMID: 36659355
DOI: 10.1016/j.scib.2017.01.022

Abstract

With well-defined channels and tunable functionality, metal-organic frameworks (MOFs) have inspired the design of a new class of ion-conductive compounds. In contrast to the extensive studies on proton-conductive MOFs and related membranes attractive for fuel cells, rare reports focus on MOFs in preparation of anion exchange membranes. In this study, chloromethylated MIL-101(Cr) was prepared and incorporated into chloromethylated poly (ether ether ketone) (PEEK) as a multifunctional filler to prepare imidazolium PEEK/imidazolium MIL-101(Cr) (ImPEEK/ImMIL-101(Cr)) anion exchange membrane after synchronous quaternization. The successful synthesis and chloromethylation of MIL-101(Cr) were verified by transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy while the enhanced performance of composite membranes in hydroxide conductivity, mechanical strength and dimensional stability were evaluated by alternating-current impedance, electronic stretching machine and measurement of swelling ratio. Specifically, incorporating 5.0wt% ImMIL-101(Cr) afforded a 71.4% increase in hydroxide conductivity at 20°C, 100% RH. Besides, the composite membranes exhibited enhanced dimensional stability and mechanical strength due to the rigid framework of ImMIL-101(Cr). At room temperature and the ImMIL-101(Cr) content of 10wt%, the swelling ratio of the ImPEEK/ImMIL-101(Cr) was 70.04% lower while the tensile strength was 47.5% higher than that of the pure membrane.

Keywords: Chloromethylation; Composite anion exchange membranes; MIL-101(Cr); Poly (ether ether ketone); Quaternization.