期刊
JOURNAL OF POWER SOURCES
卷 286, 期 -, 页码 571-579出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.04.030
关键词
Sulfonated poly(imide benzimidazole); Cross-linked; Proton exchange membrane
资金
- Fundamental Research Funds for the Central Universities [WD1315012]
- Shanghai Pujiang Program [D200-2R-1181]
Ionic cross-linked sulfonated polyimides containing bis-benzimidazole rings have been prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), 6,6'-bis[2-(4-aminophenyl)benzimidazole] (BAPBI) and 3,3'-bis(4-sulfophenoxy)- benzidine (BSPOB). A new cross-linker, 4,4'-bibromomethenyl diphenyl ether, is used to induce covalent cross-linking between halogen and imidazole groups in SPIBI chains via a facile thermally activated reaction. The resulted covalent and ionic cross-linked membranes show an improved resistance to hydrolytic attack in deionized water at 80 degrees C (more than two months) and free radical attack in Fenton's solution (more than 690 min) as compared to non-cross-linked SPIBIs (less than two days and 270 min, respectively). Cross-linking also results in a reduction in proton conductivity due to the blockage of a hydrophilic channel. However, all the prepared CBr-ySPIBI-x membranes show a proton conductivity higher than 10(-2) S cm(-1) under hydrous condition. This could be attributed to the fact that more cross-linking sites are contained in each repeating unit, which ensures enough cross-linking degree at high sulfonation level. All these results suggest that CBr-ySPIBI-x membranes have a great potential for applications in the proton exchange membrane fuel cells. (C) 2015 Elsevier B.V. All rights reserved.
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