Phosphoric acid doped polybenzimidazole membranes: Physiochemical characterization and fuel cell applications

被引：275

作者：

Qingfeng L. ^{[1
]}

Hjuler H.A. ^{[1
]}

Bjerrum N.J. ^{[1
]}

机构：

[1] Materials Science Group, Department of Chemistry, Technical University of Denmark

来源：

Journal of Applied Electrochemistry | 2001年 / 31卷 / 07期

关键词：

Electrolyte; Fuel cell; Polybenzimidazole (PBI); Polymer membrane;

D O I：

10.1023/A:1017558523354

中图分类号：

学科分类号：

摘要：

A polymer electrolyte membrane fuel cell operational at temperatures around 150-200 °C is desirable for fast electrode kinetics and high tolerance to fuel impurities. For this purpose polybenzimidazole (PBI) membranes have been prepared and H3PO4-doped in a doping range from 300 to 1600 mol %. Physiochemical properties of the membrane electrolyte have been investigated by measurements of water uptake, acid doping level, electric conductivity, mechanical strength and water drag coefficient. Electrical conductivity is found to be insensitive to humidity but dependent on the acid doping level. At 160 °C a conductivity as high as 0.13 S cm-1 is obtained for membranes of high doping levels. Mechanical strength measurements show, however, that a high acid doping level results in poor mechanical properties. At operational temperatures up to 190 °C, fuel cells based on this polymer membrane have been tested with both hydrogen and hydrogen containing carbon monoxide.

引用

页码：773 / 779

页数：6

共 29 条

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