通过溶液缩聚法合成具有良好溶解度的磺化聚苯并咪唑(SPBI),采用溶液浇铸法制备了不同磺化比例的SPBI-30和SPBI-70质子交换膜。结果表明,SPBI质子交换膜表面光滑平整,SEM断面显示SPBI-70膜具有更紧密的结构。SPBI质子交换膜在高温下具有良好的热稳定性,SPBI-70膜拉伸强度为115.74MPa,断裂伸长率为58.45%,相较于Nafion117膜拉伸强度明显提高。SPBI-70膜的磷酸掺杂在48h后达到平衡,其磷酸掺杂率达到185.13%。磺酸基团与磷酸基团的协同作用,加快了质子传递速率,促进了质子传导,SPBI-70膜在160℃,20%RH下质子电导率可达61.4mS/cm。这些特性表明SPBI质子交换膜有望应用于高温质子交换膜燃料电池。
Sulfonated polybenzimidazoles (SPBI) with good solubility were synthesized by solution polycondensation method.SPBI-30 and SPBI-70 proton exchange membranes with different sulfonation ratios were prepared by solution casting method.The results showed that the surfaces of SPBI proton exchange membranes were smooth and flat,and the SEM cross section showed that the SPBI-70 membrane had a more compact structure.The SPBI proton exchange membranes had good thermal stability at high temperature.The tensile strength of SPBI-70 membrane was 115.74MPa and the elongation at break was 58.45%,which was significantly higher than that of Nafion117 membrane.The phosphoric acid doping of the SPBI-70 membrane reached equilibrium after 48h,and the phosphoric acid doping rate reached 185.13%.The synergistic effect of sulfonic acid and phosphate groups accelerated proton transfer rate and promoted proton conduction.The proton conductivity of SPBI-70 membrane reached 61.4mS/cm at 160℃ and 20% RH.These characteristics indicated that SPBI membranes were promising for applications in high temperature proton exchange membrane fuel cells.
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基金资助
中国石油化工股份有限公司科技项目(222230);江苏省精细石油化工重点实验室开放课题基金资助项目(KF2106);江苏省研究生科研与实践创新计划项目(SJCX23-1529)
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