Doping phosphoric acid in polybenzimidazole membranes for high temperature proton exchange membrane fuel cells

被引:103
作者
He, Ronghuan
Li, Qingfeng
Jensen, Jens Oluf
Bjerrum, Niels J.
机构
[1] Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark
[2] NE Univ, Coll Sci, Shenyang 110004, Peoples R China
关键词
acid doping; fuel cell; phosphoric acid; polybenzimidazole; proton exchange membrane;
D O I
10.1002/pola.22053
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polybenzimidazole (PBI) membranes were doped in phosphoric acid solutions of different concentrations at room temperature. The doping chemistry was studied using the Scatchard method. The energy distribution of the acid complexation in polymer membranes is heterogeneous, that is, there are two different types of sites in PBI for the acid doping. The protonation constants of PBI by phosphoric acid are found to be 12.7 L mol(-1) (K-1) for acid complexing sites with higher affinity, and 0.19 L mol(-1) (K-2) for the sites with lower affinity. The dissociation constants for the complexing acid onto these two types of PBI sites are found to be 5.4 X 10(-4) and 3.6 X 10(-2), respectively, that is, about 10 times smaller than that of aqueous phosphoric acid in the first case but 5 times higher in the second. The proton conducting mechanism is also discussed. (c) 2007 Wiley Periodicals, Inc.
引用
收藏
页码:2989 / 2997
页数:9
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