Porous Polybenzimidazole Membranes Doped with Phosphoric Acid: Highly Proton-Conducting Solid Electrolytes
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- 作者：David Mecerreyes ; Hans Grande ; Oscar Miguel ; Estibalitz Ochoteco ; Rebeca Marcilla ; and Igor Cantero
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：February 24, 2004
- 年：2004
- 卷：16
- 期：4
- 页码：604 - 607
- 全文大小：198K
- 年卷期：v.16,no.4(February 24, 2004)
- ISSN：1520-5002
文摘
New proton-conducting polymer electrolytes based on new porous films of polybenzimidazole doped with phosphoric acid have been obtained. The porous polybenzimidazole filmswere prepared by leaching out a low-molecular-weight compound using a selective solventof the porogen from polymer/porogen mixtures. This method allows control over the porositylevel up to porosities of 75%. The pore size and morphology strongly depend on the porogen/PBI ratio as observed by SEM. The pore size varies from <100 nm with spherical shape forlow porosities to very irregular and interconnected structures of 10-15 
m at the highestporosity levels. Different porogens lead to smaller pore sizes in the order dibutylphthalate>dimethyl phthalate>diphenyl phthalate>triphenyl phosphate. The acid uptakeof the membranes, and therefore the ionic conductivity of the films, increases with theporosity. Ionic conductivity as high as 5 × 10-2 S/cm and mechanically stable membranesare easily obtained by soaking the highly porous films in phosphoric acid solutions.
m at the highestporosity levels. Different porogens lead to smaller pore sizes in the order dibutylphthalate>dimethyl phthalate>diphenyl phthalate>triphenyl phosphate. The acid uptakeof the membranes, and therefore the ionic conductivity of the films, increases with theporosity. Ionic conductivity as high as 5 × 10-2 S/cm and mechanically stable membranesare easily obtained by soaking the highly porous films in phosphoric acid solutions.