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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 精细化工全国重点实验室主任，教育部智能材料化工前沿科学中心执行主任，大连理工大学膜科学与技术研究开发中心主任
性别：女
毕业院校：中国科学院大连化物所
学位：博士
所在单位：化工学院
学科：化学工程. 膜科学与技术. 生物医学工程
联系方式：hgaohong@dlut.edu.cn
电子邮箱：hgaohong@dlut.edu.cn
Modification of Hydrophilic Channels in Nafion Membranes by DMBA: Mechanism and Effects on Proton Conductivity
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论文类型：期刊论文
发表时间：2014-08-15
发表刊物：JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
收录刊物：SCIE、EI、Scopus
卷号：52
期号：16
页面范围：1107-1117
ISSN号：0887-6266
关键字：molecular dynamics; phase separation; polyelectrolytes; proton conductive channels; self-organization
摘要：Modification of proton conductive channels (PCCs) in Nafion has been achieved with the assistance of 3, 4-dimethylbenzaldehyde (DMBA). During annealing, ionic clusters develop from small isolated spheres (1.72 nm) to wide continuous channels (5.15 nm), and the crystallinity of Nafion/DMBA membranes is also improved from 17% to 32% as shown by X-ray diffraction. Molecular dynamic simulation reveals that hydrogen bonding and hydrophobic interaction between DMBA and Nafion work synergistically to achieve better phase separation. The morphology-property relationship shows that, versus various PCCs width, the corresponding proton conductivities vary greatly from 0.079 to 0.139 S/cm at 80 degrees C. By carefully tuning the width of PCCs, the proton conductivity shows an improvement of 22-34% as compared with pristine Nafion. A significant enhancement on the maximum power density is achieved for the membrane electrode assembly on Nafion/DMBA-8h (as high as 1018 mW/cm(-2)), yielding an enhancement of 39% on pristine Nafion-8h (730 mW/cm(-2)). (C) 2014 Wiley Periodicals, Inc.