化工进展 ›› 2020, Vol. 39 ›› Issue (7): 2751-2757.doi: 10.16085/j.issn.1000-6613.2019-1573

• 材料科学与技术 • 上一篇    下一篇

磺化聚苯并咪唑/膦酸改性氧化石墨烯质子交换复合膜的制备及性能

张琪(), 张奎, 钟璟(), 徐荣   

  1. 常州大学石油化工学院,江苏省绿色催化材料与技术重点实验室,江苏 常州 213164
  • 发布日期:2020-07-10
  • 通讯作者: 钟璟 E-mail:zhangqi@cczu.edu.cn;zjwyz@cczu.edu.cn
  • 作者简介:张琪(1978—),女,博士,副教授,研究方向为膜分离技术。E-mail:zhangqi@cczu.edu.cn
  • 基金资助:
    国家自然科学基金(21306012);江苏省绿色催化材料与技术实验室开放课题(BM2012110);江苏省高校优势学科建设项目;江苏省高校自然科学研究重大项目(18KJA530001);常州大学先进催化与绿色制造协同创新中心支持项目

Preparation and properties of sulfonated polybenzimidazole/phosphonic acid modified graphene oxide proton exchange composite membrane

Qi ZHANG(), Kui ZHANG, Jing ZHONG(), Rong XU   

  1. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
  • Published:2020-07-10
  • Contact: Jing ZHONG E-mail:zhangqi@cczu.edu.cn;zjwyz@cczu.edu.cn

摘要:

通过胺基膦酸化法改性氧化石墨烯(GO)合成接枝有膦酸基团和磺酸基团的膦酸改性氧化石墨烯(MGO),热重分析表明MGO具有良好的热稳定性。通过原位聚合法将MGO掺杂到磺化聚苯并咪唑(SPBI)中,成功制备了SPBI/MGO质子交换复合膜。SEM表明膜表面致密,MGO的加入使断面出现片状结构。SPBI/MGO-1%复合膜的酸掺杂率最高达到248.8%,MGO的掺杂提高了复合膜的热稳定性。复合膜的干膜拉伸强度相对于Nafion117膜(26.65MPa)提高了36%,SPBI/MGO-1%的湿膜的拉伸强度达到69.46MPa,相较于SPBI膜提高了41.2%,复合膜具有较高的力学性能。SPBI/MGO复合膜的质子电导率随着MGO含量增加而逐渐增加,SPBI/MGO-1%复合膜在10%RH和160℃条件下质子电导率达到0.193S/cm,在高温低湿的质子交换膜燃料电池中有较高的应用前景。

关键词: 氧化石墨烯, 原位聚合法, 高温, 低湿度, 磺化聚苯并咪唑

Abstract:

Phosphonic acid modified graphene oxide (MGO) grafted with phosphonic acid groups and sulfonic acid groups was synthesized by phosphorylation of the aminated graphene oxide (GO). Thermogravimetric analysis indicated that MGO had good thermal stability. The sulfonated polybenzimidazole (SPBI)/MGO composite membrane was successfully prepared by doping MGO into SPBI by in-situ polymerization. SEM showed that the membrane surface was dense and the addition of MGO presented a flake structure in the cross section. The SPBI/MGO-1% composite membrane had the highest acid doping rate of 248.8%. The addition of MGO improved the thermal stability of the composite membrane. The tensile strength of the dry composite membrane increased by 36% compared to the Nafion117 membrane (26.65MPa) and the tensile strength of the SPBI/MGO-1% wet membrane reached 69.46MPa, which was 41.2% higher than that of the SPBI membrane. The composite membrane had high mechanical properties. The proton conductivity of SPBI/MGO composite membranes increased with the increase of MGO content. The proton conductivity of SPBI/MGO-1% composite membrane reached 0.193S/cm at 160℃ and 10% RH, indicating its high application prospect in high temperature and low humidity proton exchange membrane fuel cells.

Key words: grapheme oxide, in-situ polymerization, high temperature, low humidity, sulfonated polybenzimidazole

中图分类号: 

  • TM911.4