羰基和砜基共交联磺化聚酰亚胺质子交换膜的制备及燃料电池性能

Preparation and Fuel Cell Performance of Carbonyl and Sulfone Groups Co-crosslinked Sulfonated Polyimide Proton Exchange Membranes

为提高磺化聚酰亚胺质子交换膜(SPI PEM)的高温耐水解稳定性及电池性能,用3,5-双(4-氨基苯氧基)苯甲酸(BAPBa)制备了一系列六元环型SPI PEM,利用甲磺酸/五氧化二磷溶液(PPMA)制备了羰基和砜基共交联的SPI PEM.测定了SPI PEM的质子传导率、耐水解稳定性、机械性能及电池性能.结果表明,羰基和砜基共交联提高膜交联度的同时减少了磺酸基的消耗,使SPI PEM保持较高的质子传导率.在相对湿度为50%RH时,羰基和砜基共交联SPI PEM的质子传导率为7.8 m S/cm,比同样条件下砜基交联的SPI PEM提高28%.羰基和砜基共交联的SPI PEM在130℃水中老化500 h后断裂伸长率为18%,质子传导率未明显降低.羰基和砜基共交联SPI PEM作为电池时,最大功率密度达到0.85 W/cm2,是砜基交联PEM的1.3倍.

A series of six-membered ring type SPI PEMs was synthesized with 3,5-bis（ 4-aminophenoxy） benzoic acid（ BAPBa）. Carbonyl and sulfone co-crosslinked SPI PEMs were prepared by methanesulfonic acid /phosphorus pentoxide solution（ PPMA）. Their properties including proton conductivity,hydrolysis resistance,mechanical properties and fuel cell performance were investigated. The results showed that the crosslinking degree of carbonyl and sulfone co-crosslinked SPI PEMs increased,while the consumption of sulfonic acid group decreased,which kept the SPI PEMs maintaining high proton conductivity when compared to the sulfone groups crosslinked ones. For example,the proton conductivity of the carbonyl and sulfone co-crosslinked SPI PEM was 7. 8 m S / cm at 50%RH,which increased by 28%. After aging in water at 130 ℃ for 500 h,elongation at break of the carbonyl and sulfone co-crosslinked SPI PEM was 18% and no obvious reduction in proton conductivity. Fuel cell performance showed that,the maximum power output of the carbonyl and sulfone co-crosslinked SPI PEM reached 0. 85 W / cm2,which was 1. 3 times higher than that of sulfone crosslinked one.