Fixation of nanosized proton transport channels in membranes

被引:144
作者
Won, J
Park, HH
Kim, YJ
Choi, SW
Ha, HY
Oh, IH
Kim, HS
Kang, YS
Ihn, KJ
机构
[1] Sejong Univ, Dept Appl Chem, Seoul 143747, South Korea
[2] Kangwon Natl Univ, Dept Chem Engn, Chunchon 200701, Kangwon, South Korea
[3] Korea Inst Sci & Technol, Seoul 130650, South Korea
关键词
D O I
10.1021/ma034014b
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The structure of proton transport channels is controlled and fixed in sulfonated poly(styrene-b-butadiene-b-styrene) (SBS) triblock copolymer membranes. Microphase-separated SBS membranes were cross-linked by UV irradiation in the presence of a photoinitiator and then sulfonated by acetyl sulfate. Sulfonated cross-linked SBS (scSBS) membranes with fixed nanosized proton transport channels were then prepared. The scSBS membranes show good proton conductivity, comparable to that of Nafion, and a low methanol permeability, more than 1 order of magnitude smaller than that of Nafion. Sulfonated non-cross-linkable poly(styrene-b-(ethylene-r-butylene)-b-styrene) membranes and sulfonated cross-linked poly(styrene-r-butadiene) membranes, which have less developed proton transport channels, were also prepared for comparison. The effects of the presence and size of the proton transport channels on the proton conductivity and methanol permeability were investigated. It is concluded that both the structure and the fixation of the proton transport channels are crucial to the functioning of proton exchange membranes of direct methanol fuel cells.
引用
收藏
页码:3228 / 3234
页数:7
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