| 초록 |
We have investigated novel anhydrous proton-conducting membranes formed by incorporating ionic liquids into synthetic block copolymer electrolytes, poly(styrenesulfonate-methylbutylene) (SnMBm), aimed to high temperature proton exchange fuel cell applications. The resulting composite membranes are transparent, flexible, and show a good thermal stability upto 180 oC. The increase in sulfonation level of SnMBm copolymers (proton supplier) and concentration of ionic liquid (proton mediator) brings overall increase in conductivity. The morphology effect is studied by a combination of small angle x-ray scattering, transmission electron microscopy, and electrochemical measurements. Compared with the membranes lacking organization, the nanostructured composite membranes reveal over an order of magnitude increase in conductivity where the utmost conductivity of 0.045 S/cm is obtained at 165 oC. |
