科研之友
微信
新浪微博
Facebook
分享链接
摘要
Polybenzimidazole (PBI) is one of the polymers of choice to replace Nafion (R) in polymer fuel cells working at high temperature. In order to improve the membrane electrical properties, several monomer modifications are proposed, including sulfonation which, however, is not generally uniform and complete. By using a proper aryloxy-based spacer, we reported here a facile synthesis procedure which allowed us to obtain co-monomers with 100% mono- and di-sulfonation. Preliminary conductivity measurements showed that mono-sulfonation allowed to increase of one order of magnitude the proton conductivity at high doping level with respect to pyridine-based PBI, so reaching values around 0.1Scm1 at 120 degrees C and 50% RH. Di-sulfonation is efficient only at lower doping levels, where it allows a further 23 times increase of the conductivity. These materials are promising as membranes for polymer fuel cells.
- 出版日期2013-2
