Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 7, Pages 3479-3487Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b00698
Keywords
anion exchange membranes; poly(vinylbenzyl chloride); alkaline stability; phase separation; fuel cells
Funding
- National Nature Science Foundation of China [21576226, 21376194]
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To enhance the ionic conductivity and mechanical property of the chemically stable aliphatic anion exchange membranes (AEMs), cross-linked poly(vinylbenzyl chloride) AEMs (PVBC-xQ4) bearing long flexible cross-linker chains with multiple quaternary ammonium (QA) head were prepared via a facile one-step process. The AEMs exhibit high conductivity and excellent mechanical property. The cross-linked AEMs excluding any other heteroatomic bond especially the sulfone linkage or ether bond in the backbone have robust alkaline stability, low water uptake, and good dimensional stability. A well developed hydrophilic/hydrophobic phase separated morphology was observed by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The PVBC-50Q4 membrane with ionic exchange capacity (IEC) of 1.87 mequiv g-1 displays a highest ionic conductivity of 74.3 mS cm(-1) at 80 degrees C. After tested in a 2 M aqueous KOH solution at 80 C for 1300 h, 88% of the conductivity and 89% of the IEC were remained. Furthermore, a single cell using the PVBC-50Q4 membrane has a maximum peak power density of 109.2 mW cm(-2) at 60 degrees C.
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