膜科学与技术

磷酸掺杂bSPEEK-OPBI共混质子交换膜的制备及性能

作者：宋洁瑞，肖意明，张蕾，项军，唐娜，程鹏高，张建平，王松博，杜威

单位：天津科技大学化工与材料学院，天津，300457

关键词：聚苯并咪唑；磺化聚醚醚酮；质子交换膜；质子传导率；磷酸流失

出版年,卷(期):页码： 2022,42(1):1-9

摘要：

为改善磷酸-聚苯并咪唑（PA-PBI）质子交换膜在燃料电池运行过程中磷酸浸出的问题以及进一步提高其质子传导率和机械强度，本文用高磺化度支链磺化聚醚醚酮（bSPEEK）与芳醚型聚苯并咪唑（OPBI）进行酸碱共混，利用流延法制备磷酸掺杂质子交换膜。结果表明，共混膜中bSPEEK最佳含量为30%，共混膜的体积溶胀率降低26.5%；机械强度提高83.7%；质子传导率分别提高43.8%（160 oC/0% 相对湿度（RH））和29.1%（80 oC/98% RH）；60 oC/98% RH条件下的磷酸流失率降低48.8%。共混膜在提高机械强度和质子传导率的同时有效抑制了磷酸流失。

In this work, we aimed to solve the problem of phosphoric acid leaching and improve the proton conductivity and mechanical strength of phosphoric acid polybenzimidazole (PA-PBI) proton exchange membrane. The phosphoric acid doped proton exchange membranes were prepared by casting method via co-blending high sulfonation degree branched-chain sulfonated polyether ether ketone (bSPEEK) and poly(aryl ether benzimidazole) (OPBI). The volume swelling ratio of the blend membrane decreased by 26.5%, and the mechanical strength increased by 83.7% under the optimal content of bSPEEK (30% w/w). And the proton conductivity in high temperature range (160 oC/0% RH) and low temperature range (80 oC/98% RH) increased by 43.8 % and 29.1%, respectively. The phosphoric acid loss in low temperature range decreased by 48%. In conclusion, the mechanical strength and proton conductivity of the co-blend membrane were improved as well as effectively inhibiting the loss of phosphoric acid.

宋洁瑞（1995-），女，甘肃兰州人，研究生，研究方向为燃料电池关键材料

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