纺织学报 ›› 2020, Vol. 41 ›› Issue (06): 8-13.doi: 10.13475/j.fzxb.20190600506

• 纤维材料 • 上一篇    下一篇

氧化石墨烯量子点/聚丙烯腈纳米纤维复合质子交换膜的制备及其性能

王树博1,2, 秦湘普3, 石磊3, 庄旭品3(), 李振环1,2   

  1. 1.天津工业大学 材料科学与工程学院, 天津 300387
    2.天津工业大学 分离膜与膜过程国家重点实验室, 天津 300387
    3.天津工业大学 纺织科学与工程学院, 天津 300387
  • 收稿日期:2019-06-03 修回日期:2020-03-15 出版日期:2020-06-15 发布日期:2020-06-28
  • 通讯作者: 庄旭品
  • 作者简介:王树博(1994—),男,博士生。主要研究方向为纳米纤维制备和功能非织造材料。
  • 基金资助:
    国家自然科学基金资助项目(51873152)

Preparation and properties of proton exchange membrane made from graphene oxide quantum dots/polyacrylonitrile nanofiber composites

WANG Shubo1,2, QIN Xiangpu3, SHI Lei3, ZHUANG Xupin3(), LI Zhenhuan1,2   

  1. 1. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
    2. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University,Tianjin 300387, China
    3. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2019-06-03 Revised:2020-03-15 Online:2020-06-15 Published:2020-06-28
  • Contact: ZHUANG Xupin

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摘要：

为提高全氟磺酸(Nafion)膜的质子传导率和尺寸稳定性,利用静电纺丝技术制备了氧化石墨烯量子点(GOQDs)/聚丙烯腈(PAN)纳米纤维膜,并通过Nafion溶液浸渍法制备了纳米纤维复合质子交换膜。借助扫描电子显微镜、共聚焦显微镜、热重分析仪和X射线衍射仪等对纳米纤维及复合膜的结构和性能进行表征。结果表明:GOQDs在PAN纳米纤维中均匀分布,GOQDs的加入减小了纳米纤维的直径;纳米纤维形成三维网络结构,对复合膜起到了骨架支撑作用,提高了复合膜的尺寸稳定性,同时提高了复合膜的热稳定性和吸水性;GOQDs质量分数的增加提高了复合膜的质子传导率,80 ℃时复合膜的质子传导率最高可达0.182 S/cm。

关键词: 静电纺丝, 聚丙烯腈纳米纤维, 氧化石墨烯量子点, 质子交换膜, 燃料电池

Abstract:

In order to improve the proton conductivity and dimensional stability of the Nafion proton exchange membrane, a well-designed structure is in high demand. A graphene oxide quantum dot (GOQDs) / polyacrylonitrile (PAN) nanofiber membrane was prepared by electrostatic spinning technology, and a nanofiber composite proton exchange membrane was prepared by Nafion solution impregnation method. The structures and properties of nanofibers and composite membranes were characterized by scanning electron microscope, confocal microscopy, thermal gravimetric analyzer and X-ray diffractometer. The results show that GOQDs are evenly distributed in PAN nanofibers, and the addition of GOQDs reduces the diameter of the nanofiber. The three-dimensional network structure of nanofibers plays a skeletal support role in the composite membrane, which improves the dimensional stability of the composite membrane. At the same time, the thermal stability and water absorption of the composite membrane is improved. With the increase of GOQDs mass fraction, the proton conductivity of the composite membrane is improved, and the maximum proton conductivity of the composite membrane reaches 0.182 S/cm at 80 ℃.

Key words: electrospinning, polyacrylonitrile nanofiber, graphene oxide quantum dot, proton exchange membrane, fuel cell

中图分类号: 

  • TM911.4

图1

PAN-GOQDs/Nafion复合质子交换膜的制备过程"

图2

PAN及PAN-GOQDs纳米纤维膜扫描电镜照片"

图3

PAN-GOQDs/Nafion复合质子交换膜的扫描电镜图"

图4

纳米纤维和复合质子交换膜共聚焦显微镜图"

图5

复合质子交换膜TG曲线"

图6

纳米纤维膜及复合质子交换膜XRD曲线"

表1

不同温度下复合质子交换膜的吸水率和溶胀率"

样品名称 吸水率 溶胀率
20 ℃ 40 ℃ 60 ℃ 80 ℃ 20 ℃ 40 ℃ 60 ℃ 80 ℃
重铸Nafion 13.2 20.5 31.9 42.6 13.6 14.6 17.7 21.1
PAN/Nafion 12.8 18.9 30.2 40.9 8.2 9.5 11.9 15.4
PAN-GOQDs1/Nafion 17.8 24.3 33.6 45.7 8.4 9.7 12.4 16.2
PAN-GOQDs2/Nafion 22.4 30.1 37.8 50.4 9.9 11.2 14.1 17.1
PAN-GOQDs3/Nafion 24.1 32.7 40.6 55.4 10.8 12.3 15.4 18.1

表2

不同温度下复合质子交换膜质子传导率"

样品名称 20 ℃ 40 ℃ 60 ℃ 80 ℃
重铸Nafion 0.021 0.049 0.084 0.109
PAN/Nafion 0.019 0.045 0.082 0.104
PAN-GOQDs1/Nafion 0.029 0.067 0.108 0.153
PAN-GOQDs2/Nafion 0.043 0.075 0.125 0.171
PAN-GOQDs3/Nafion 0.052 0.078 0.133 0.182

图7

复合质子交换膜力学性能曲线"

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