焉晓明

个人信息Personal Information

教授

博士生导师

硕士生导师

任职 : 辽宁省石化行业高效节能分离技术工程实验室副主任

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:化工海洋与生命学院

学科:化学工程. 膜科学与技术

办公地点:D01-316B

联系方式:0427-2631819

电子邮箱:yanxiaoming@dlut.edu.cn

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Improvement of alkaline stability for hydroxide exchange membranes by the interactions between strongly polar nitrile groups and functional cations

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论文类型:期刊论文

发表时间:2017-07-01

发表刊物:JOURNAL OF MEMBRANE SCIENCE

收录刊物:SCIE、EI

卷号:533

页面范围:121-129

ISSN号:0376-7388

关键字:Anion exchange membrane; Alkaline stability; Fuel cell; Imidazolium; Morpholinium

摘要:Hydroxide exchange membrane fuel cells (HEMFCs) are attracting growing interest owing to their advantages such as low cost and high power density. However, their applications are hindered due to the poor stability of the membrane. Here, we proposed a novel strategy to improve the alkaline stability of hydroxide exchange membranes (HEMs) using the interactions between strongly polar nitrile groups and side-chain functional cations. A poly(ether nitrile) (PEN) was synthesized by the polycondensation of bisphenol A and 2,6-difluorobenzonitrile, and then imidazolium and morpholinium functional groups were integrated by the typical chloromethylation-functionalization method. The existence of the interactions between nitrile groups and cation groups i.e. imidazolium and morpholinium, was proved by the density functional theory calculations. The interactions have two positive effects that contribute to the improvement of the alkaline stability of the PEN based membranes. On the one hand, they increase the LUMO energies of the functional groups; and on the other hand they reduce the free volume around hydrated cationic groups. As a result, PEN based membranes showed much better alkaline stabilities compared to the membrane based on commercial polysulfone that has a similar chemical structure. In addition, given similar swelling ratios, PEN based membranes exhibited higher hydroxide conductivities than simple polysulfone based ones.