Modification of Hydrophilic Channels in Nafion Membranes by DMBA: Mechanism and Effects on Proton Conductivity
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Wang, Rujie
- 通讯作者：
- He, GH (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Res & Dev Ctr Membrane Sci & Technol, Dept Chem Engn, Dalian 116024, LN, Peoples R China.
- 合写作者：
- Yan, Xiaoming,Wu, Xuemei,He, Gaohong,Du, Lin,Hu, Zhengwen,Tan, Ming
- 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
- 文献类型：
- J
- 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.
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- 否
