研制了聚苯并咪唑(PBI)的复合膜,复合膜中引入的组分包括无机质子导体磷酸氢锆(Zr(HPO4)2·nH2O,ZrP)和聚砜(PSF),以及磺化的酸型聚砜(SPSF(H)). 热失重分析表明,复合膜PBI/ZrP/PSF和PBI/SPSF(H)的热稳定性可分别达400和230 ℃. 磷酸掺杂的PBI复合膜在温度高达200 ℃的低湿度条件下,呈现出高质子电导率. 以磷酸掺杂的PBI 复合膜为电解质,在200 ℃常压不加湿的条件下,以氢气氧气为燃料气进行了单电池测试,其最大功率密度分别为0.34 W/cm2(PBI/ZrP/PSF(质量比80: 15: 5))和0.38 W/cm2(PBI/SPSF(0.43H)).%Polybenzimidazole(PBI) composite membranes were prepared. The introduced components included inorganic proton conductor, sulfonated polysulfone(SPSF(H)). Thermogravimetric analysis indicated that the composite membranes were thermal stable up to 400 ℃ for the PBI/ZrP/PSF system and 230 ℃ for the PBI/SPSF(H) system, respectively. Phosphoric acid doped PBI composite membranes exhibited a high conductivity at temperatures up to 200 ℃ under low humidity. Single cell tests with electrolytes of acid doped PBI composites were performed at 200 ℃ under atmospheric pressure and without humidification. The maximum power density of the cell with hydrogen or oxygen as the fuel gas is 0.34 W/cm2 for PBI/ZrP/PSF(mass ratio 80:15:5), and 0.38 W/cm2 for acid doped PBI/SPSF(0.43H), respectively.
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