Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 568, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.09.050
Keywords
Covalent organic framework; Zwitterion; Nafion; Composite membranes; Proton conductivity
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Funding
- National Natural Science Foundation of China [21621004, 21576189, 21490583]
- National Key R&D Program of China [2017YFB0603400]
- Natural Science Foundation of Tianjin [16JCZDJC36500]
- Programme of Introducing Talents of Discipline to Universities [B06006]
- Open Research Fund Program of State Key Laboratory of Engines (Tianjin University) [K2018-13]
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The construction of efficient proton transport channels in ion-conducive membranes is crucial to proton exchange membrane fuel cells (PEMFCs). Herein, zwitterion-functionalized covalent organic framework (Z-COF) with both ammonium groups and sulfonic acid groups was synthesized and blended with Nafion to prepare Nafion/Z-COF composite proton exchange membranes. The polymer-like feature of the Z-COF imparted favorable interactions between Z-COF and Nafion, and thus promoted the dispersion of Z-COF and the reorganization of ion clusters. The incorporation of Z-COF enhanced water retention property and the sulfonic groups on Z-COF provided additional proton-transport sites within the membranes. As a result, the low-energy-barrier paths for proton transport were created. The composite membranes with 10 wt% of Z-COF exhibited the highest proton conductivity of 0.22 S cm(-1) at 80 degrees C and 100% RH, which was 57.1% higher than that of recast Nafion membrane. The enhanced proton conductivity also afforded the composite membrane a 45.7% increase in maximum power density of single fuel cell at 80 degrees C and 50% RH. The effects of Z-COF loading on membrane morphology, polymer chain mobility, thermal stability, water uptake and dimensional stability were also investigated.
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