磺化聚苯并咪唑-聚醚砜高温复合质子交换膜的制备及性能研究

Study on the Preparation and Performance of Sulfonated Polybenzimidazole-Polyethersulfone High Temperature Composite Proton Exchange Membranes

采用微波合成法快速、简便地合成磺化聚苯并咪唑(SPBI),并用傅利叶红外光谱(FT-IR)和核磁共振氢谱(1H NMR)对其结构进行了表征。利用溶液成膜法将合成的SPBI与聚醚砜(PES)共混制备了一种高温质子交换膜燃料电池(HT-PEMFCs)用SPBI-PES膜,该膜没有表现出明显的相分离,与单独的SPBI膜相比,具有更好的成膜性、热稳定性、抗自由基氧化性及尺寸稳定性。当磷酸(PA)掺杂量为10.15%时,在160℃未加湿条件下,SPBI-PES膜的质子传导率为79.9mS•cm^(-1)。以未加湿的氢气和氧气做燃料,在150℃下燃料电池单电池测试,开路电压为0.95V,最高功率密度为0.191W·cm^(-2)。

SPBI was fast synthesized by a microwave synthesis method with simple operation and the structure was confi rmed by FT-IR and 1H NMR spectra.And then a novel sulfonated polybenzimidazole(SPBI)with polyethersulfone(PES)blend membrane was successfully prepared by solution casting method without obvious phase saparation for high temperature proton exchange membrane fuel cells(HT-PEMFCs),and showed better film forming ability,thermal stability,radical oxidative stability and dimensional stability than that of pristine SPBI membrane.The SPBI-PES blend membrane with the phosphoric acid(PA)doping content of 10.15%exhibited a proton conductivity of 79.9mS•cm^(-1) at 160℃without humidity.Fuel cell tests showed an open circuit voltage as high as 0.95V and a peak power density of 0.191W·cm^(-2) at 150℃with unhumidified hydrogen and oxygen.