通过掺入十二烷基苯磺酸钠提高磺化聚醚醚酮膜的质子传导率

Enhanced Proton Conductivity in Sulfonated Poly(ether ether ketone) Membranes by Incorporating Sodium Dodecyl Benzene Sulfonate.

作者信息

Zhai Shaoxiong, Dai Wenxu, Lin Jun, He Shaojian, Zhang Bing, Chen Lin

机构信息

Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China.

出版信息

Polymers (Basel). 2019 Jan 24;11(2):203. doi: 10.3390/polym11020203.

It is of great importance to improve the proton conductivity of proton exchange membranes by easy-handling and cost-efficient approaches. In this work, we incorporated a commercially obtained surfactant, sodium dodecyl benzene sulfonate (SDBS), into sulfonated poly(ether ether ketone) (SPEEK) through solution casting to prepare SPEEK/SDBS membranes. When no more than 10 wt % SDBS was added, the SDBS was well dissolved into the SPEEK matrix, and the activation energy for the proton transfer in the SPEEK/SDBS membranes was greatly reduced, leading to significant enhancement of the membrane proton conductivity. Compared with the SPEEK control membrane, the SPEEK/SDBS membrane with 10 wt % SDBS showed a 78% increase in proton conductivity, up from 0.051 S cm to 0.091 S cm, while the water uptake increased from 38% to 62%. Moreover, the SPEEK/SDBS membrane exhibited constant proton conductivity under a long-term water immersion test.

通过简便易行且经济高效的方法提高质子交换膜的质子传导率具有极其重要的意义。在这项工作中，我们通过溶液浇铸将市售表面活性剂十二烷基苯磺酸钠（SDBS）掺入磺化聚醚醚酮（SPEEK）中，制备了SPEEK/SDBS膜。当添加的SDBS不超过10 wt%时，SDBS能很好地溶解在SPEEK基体中，并且SPEEK/SDBS膜中质子转移的活化能大幅降低，从而导致膜质子传导率显著提高。与SPEEK对照膜相比，含有10 wt% SDBS的SPEEK/SDBS膜的质子传导率从0.051 S/cm提高到0.091 S/cm，增长了78%，而吸水率从38%增加到62%。此外，在长期水浸试验中，SPEEK/SDBS膜表现出恒定的质子传导率。