| 초록 |
In developing membranes for use in high temperature polymer membrane fuel cell (HT-PEMFC), polybenzimidazole (PBI) has been widely used for its thermal and chemical stability and good proton conductivity. One of its variation is PBI-OO, however, in its neat state, it is very soluble in phosphoric acid and cannot be used for HT-PEMFC. However with the addition of our filler combined with thermal crosslinking method, it was able to withstand the harsh conditions of HT-PEMFC. In this poster we have synthesized surfaced modified titanium dioxide with phenyl and sulfuric functional group and incorporated into PBI-OO. The sulfuric group was then crosslinked to the polymer chain via thermal curing. Several composite membranes were prepared with varying level of filler and their performances were compared to that of neat cured PBI-OO. 6 wt% showed highest performance, with 98 mScm-1 at 160 Co and peak power density of 356 mWcm-2, which is higher than that of pure c-PBI-OO. |
