期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 34, 页码 19446-19454出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05840
关键词
degradation mechanism; polysulfone; 4,4 '-bipyridine; hybrid orbital; anion exchange membranes; vanadium flow battery
资金
- China Natural Science Foundation [21206158, 21476224, 51361135701]
- Outstanding Young Scientist Foundation
- Chinese Academy of Sciences [KG2D-EW-602-2]
- Science and Technology Service Network Initiative [KFJ-EW-STS-108]
- Dalian Municipal Outstanding Young Talent Foundation [2014J11JH131]
- Chinese Academy of Sciences (CAS)
The stability of hydrocarbon ion exchange membranes is one of the critical issues for a flow battery. However, the degradation mechanism of ion exchange membranes has been rarely investigated especially for anion exchange membranes. Here, the degradation mechanism of polysulfone based anion exchange membranes, carrying pyridine ion exchange groups, under vanadium flow battery (VFB) medium was investigated in detail. We find that sp(2) hybrid orbital interactions between pyridinic-nitrogen in 4,4'-bipyridine and benzylic carbon disrupt the charge state balance of pristine chloromethylated polysulfone. This difference in electronegativity inversely induces an electrophilic carbon center in the benzene ring, which can be attacked by the lone pair electron on the vanadium(V) oxygen species, further leading to the degradation of polymer backbone, while leaving the 4,4'-bipyridine ion exchange groups stable. This work represents a step toward design and construction of alternative type of chemically stable hydrocarbon ion exchange membranes for VFB.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据