离子型交联磺化聚酰亚胺质子交换膜的制备及高温燃料电池性能

A series of ionic crosslinked sulfonated polyimide based proton exchange membranes（SPI PEMs）was prepared by casting method after copolymerization of 2，2′-bis（4-sulfophenoxy）benzenediamine，2-（4-aminophe-nyl）-5-aminobenzimidazole and 1，4，5，8-naphthalenetetracarbo-xylic dianhydride. The ionic crosslinked SPI PEMs show excellent mechanical properties and water stability. Those with high ion exchange capacity（IEC）show comparable proton conductivity to NR212 when under high relative humidity. The ionic crosslinked SPI PEM（coded by M1）prepared with n（BSPOB）/n（DABI）of 5/2 shows good fuel cell performance with the maximum power output （W_max）of 0.93 W/cm² under cell temperature of 90 ℃ and humidification of 80% relative humidity（RH），which is higher than NR212 with W_max of 0.86 W/cm². The cell performance largely decreases when cell temperature is up to 110 ℃ for all these PEMs. M1 shows relative high performance with the W_max of 0.54 W/cm² at 110 ℃ ，when compared to covalent crosslinked SPIs. The ionic crosslinked SPI PEM shows about 10% decrease of open circuit voltage（OCV）durability for 300 h under 110 ℃，which is much better than NR212.