期刊
MATERIALS TODAY CHEMISTRY
卷 23, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2021.100653
关键词
High-temperature proton exchange membrane; PBI dendrimer containing triazine rings; Degree of branching; Free volume; Proton conductivity
资金
- National Natural Science Foundation of China [22172093, 21776167, 21276148]
- Natural Science Foundation of Shandong Province, China [ZR2019QB012, 2019ZBXC411]
- State Key Laboratory of Chemical Engineering (Tianjin University) [SKL-ChE-14B01]
A high-temperature proton exchange membrane with high proton conductivity over a wide humidity range was synthesized by doping TPBI with ZrSP and post-crosslinking, which enhanced the mechanical stability and conductivity of the membrane material. The prepared membranes showed good thermal stability, high proton conductivity, and dimensional stability, making them promising for various applications.
A high-temperature proton exchange membrane with high proton conductivity over a wide humidity range still remains a challenge. PBI dendrimer containing triazine rings (TPBI) was synthesized to approach this aim considering its high content of hygroscopic terminal groups and of larger free volume. A novel proton conductor previously synthesized (zirconium 3-sulfopropyl phosphonate, ZrSP) was doped due to its good proton conductivity over a wide humidity range. TPBI was post-crosslinked with a tetrafunctional epoxy resin (N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane, TGDDM) to enhance the mechanical stability at low cross-linking degrees, which allowed high doping levels of ZrSP, and thus, high conductivity. The prepared membranes (TPBI-TGDDM/ZrSP) showed good thermal stability, high proton conductivity over wide humidity range, and good dimensional stability. At suitable degrees of branching, TPBI-TGDDM/ZrSP exhibited superior mechanical property, oxidative stability, methanol barrier property, and membrane selectivity than its linear analog (mPBI-TGDDM/ZrSP). As ZrSP instead of PA was applied as the proton conductor, TPBI-TGDDM/ZrSP showed good durability of proton conductivity, especially in comparison with TPBI-TGDDM/PA, which highly retarded decline in conductivity caused by PA leaking. The proton conductivity at 180 degrees C of TPBI(20)-TGDDM(10)/ZrSP(50) achieved 142, 84.2 and 23.6 mS cm(-1) at 100%, 50%, and 0 RH, respectively. (C) 2021 Elsevier Ltd. All rights reserved.
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