膜科学与技术

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Flexible ether bond quaternary phosphonium side chain based polysulfone anion exchange membrane

Authors： CUI Fujun, LIU Yong, ZHANG Yang, ZHANG Fan, WU Xuemei, HE Gaohong

Units： 1.Panjin Institute of Industrial Technology, Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Dalian University of Technology, Panjin 124221, China;2.State Key Laboratory of Fine Chemicals, Research and Development Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

KeyWords： Fuel cell; Anion exchange membrane; quaternary phosphonium functional group; hydroxide conductivity; alkali stability.

ClassificationCode：TQ028，TM912.1

year,volume(issue):pagination： 2022,42(2):16-24

Abstract：

Fuel cells provide solution to efficiently application of hydrogen energy. Anion exchange membrane (AEM) is one of the core components of anion exchange membrane fuel cell, and the selection of functional groups plays a crucial role in its performance. By bonding large sterically groups to quaternary phosphonium cation, the alkali stability of the quaternary phosphonium can be achieved, however, hydroxide conductivity is inevitably hindered. In this work, a flexible ether bond quaternary phosphonium side chain structure is proposed to simultaneously improve conductivity and alkali stability of quaternary phosphonium based AEMs. The ether bond containing aliphatic spacer between quaternary phosphonium cation and the polysulfone backbone enhances the flexibility of the functional side chain, and thus improves the aggregation of quaternary phosphonium cations. The stronger electronegativity of the ether O atom as compared with the N and C atoms increases hydrophilicity of the membranes. The large steric hindrance of the tris(2,4,6-trimethoxyphenyl) phosphine group could block the attack of hydroxide ions, therefore improve alkali stability. The flexible ether bond quaternary phosphonium side chain based polysulfone AEMs exhibit extremely low swelling ratio (about 10%), high hydroxide conductivity (79.6 mS/cm at 80 oC) and excellent alkali stability (about 90% conductivity retention and 98% strength retention after immersing in 80 oC, 1MNaOH for 168h).

Funds：

辽宁省化学助剂合成与分离省市共建重点实验室2020年开放课题（ZJKF2012），国家自然科学基金（面上21776034，创新群体22021005）；中央高校基本科研业务费(DUT21ZD406)。

AuthorIntro：

崔福军(1970-)，男，河北承德人，研究方向为荷电膜及膜过程、粘合剂等，Email：1012293273@qq.com

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