Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220140.doi: 10.7503/cjcu20220140

• Polymer Chemistry • Previous Articles     Next Articles

Preparation and High Temperature Fuel Cell Performance of Ionic Crosslinked Sulfonated Polyimides for Proton Exchange Membranes

QIU Xinsheng, WU Qin, SHI Daxin, ZHANG Yaoyuan, CHEN Kangcheng(), LI Hansheng   

  1. School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China
  • Received:2022-03-04 Online:2022-08-10 Published:2022-05-09
  • Contact: CHEN Kangcheng
  • Supported by:
    the National Natural Science Foundation of China(21306010)


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-aminophenyl)-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(Wmax) of 0.93 W/cm2 under cell temperature of 90 ℃ and humidification of 80% relative humidity(RH), which is higher than NR212 with Wmax 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 Wmax 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.

Key words: Sulfonated polyimide, Proton exchange membrane, High temperature fuel cell performance, Durability

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