Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (06): 8-13.doi: 10.13475/j.fzxb.20190600506

• Fiber Materials • Previous Articles     Next Articles

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 E-mail:zhxupin@tjpu.edu.cn

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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

CLC Number: 

  • TM911.4

Fig.1

Preparation process of PAN-GOQDs/Nafion composite proton exchange membranes"

Fig.2

SEM images of PAN and PAN-GOQDs nanofiber membranes"

Fig.3

SEM images of PAN-GOQDs/Nafion composite proton exchange membranes. (a) Surface of PAN-GOQDs2/Nafion; (b) Cross-section of PAN-GOQDs1/Nafion; (c) Cross-section of PAN-GOQDs2/Nafion; (d) Cross-section of PAN-GOQDs3/Nafion"

Fig.4

CLSM images of nanofibers and composite proton exchange membranes"

Fig.5

TG curves of composite proton exchange membranes"

Fig.6

XRD diffraction patterns of nanofiber membranes and composite proton exchange membranes"

Tab.1

Water absorption and swelling rate of composite proton exchange membranes at different temperatures%"

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

Tab.2

Proton conductivity of composite proton exchange membranes at different temperaturesS·cm-1"

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

Fig.7

Mechanical performance curves of composite proton exchange membranes"

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