Porous-Nafion/PBI composite membranes and Nafion/PBI blend membranes for Vanadium

Title
Porous-Nafion/PBI composite membranes and Nafion/PBI blend membranes for Vanadium
Authors
헨켄스마이어디억남비 크리쉬난정미나Wonmi Lee김상원Gaurav GuptaLidiya KomsiyskaCorinna HarmsYongchai Kwon
Keywords
Vanadium redox flow battery (VRFB); Porous membrane; Thin blocking layer; Polybenzimidazole (PBI); Nafion
Issue Date
2018-08
Publisher
Applied surface science
Citation
VOL 450-311
Abstract
Although Nafion membranes have a high chemical stability against VO2+ and a low resistance, their low coulomb efficiency (CE), due to crossover of vanadium cations, should be addressed. PBI membranes are chemically stable and effectively block vanadium cations, but have a lower conductivity than Nafion. Here we describe the fabrication of layered membranes, which consist of a 40&#8239; &micro; m thick porous Nafion layer and a 2&#8211; 17&#8239; m thin PBI blocking layer. To promote adhesion, a <2&#8239; m thick layer of a 1:1 Nafion/PBI blend is introduced between the outer layers. While this bonding layer is necessary to promote adhesion, the strong ionic interactions between Nafion and PBI reduce the acid uptake. Immersed in 1&#8239; M sulfuric acid (SA), the weight of meta-PBI increases 17%, while that of NP1:3, NP1:1 and NP3:1 only increases 16%, 8% and 7%, respectively. This decreases the conductivity in 2&#8239; M SA from 2.8&#8239; mS&#8239; cm&#8722; 1 for meta-PBI to 1.5, 0.4 and 0.04&#8239; 1 for NP1:3, NP1:1 and NP3:1, respectively. The initial CE of a flow battery using p-Nafion-1:1-PBI20 was as good as one with Nafion 212 (93% at 80&#8239; mA&#8239; 2), while one with p-Nafion-1:3-PBI3 showed exactly the same voltage efficiency as one with Nafion 212.
URI
https://pubs.kist.re.kr/handle/201004/68509
ISSN
0169-4332
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KIST Publication > Article
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