Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 19-26.doi: 10.13475/j.fzxb.20200302108

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of composite proton exchange membranes based on sulfonated polyethersulfone nanofibers

WANG Liyuan1,2, KANG Weimin1,2, ZHUANG Xupin1,2, JU Jingge1,2, CHENG Bowen1,2()   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. State Key Laboratory of Separation Membrane and Membrane Process, Tiangong University, Tianjin 300387, China
  • Received:2020-03-09 Revised:2020-08-14 Online:2020-11-15 Published:2020-11-26
  • Contact: CHENG Bowen E-mail:bowen15@tiangong.edu.cn

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Abstract:

To develop high-performance Nafion proton exchange membranes for fuel cells, sulfonated polyethersulfone (SPES) nanofibers with different sulfonation degrees prepared via electrospinning technology were used as additives to construct SPES nanofibers/Nafion composite proton exchange membrane. The effects of solution concentration, spinning voltage and receiving distance on the spinning process and morphology of SPES nanofibers were discussed. Under the optimal process, the effects of SPES nanofibers with different sulfonation degrees on the microstructure, water absorption, swelling, proton conductivity, and methanol permeability of the composite membrane were studied. The results show that under the electrospinning parameters of solution concentration of 30%, spinning voltage of 30 kV and receiving distance of 20 cm, the composite Nafion membrane based on the optimal SPES nanofiber with sulfonation degree of 64% exhibits balanced proton conduction (0.144 S/cm) and methanol permeability (7.58×10-7 cm2/s). The composite membrane presents the best comprehensive performance, which meets the application needs of high-performance methanol fuel cells.

Key words: proton exchange membrane, electrospinning, sulfonated polyethersulfone, nanofiber, proton conductivity, fuel cell

CLC Number: 

  • TM911.48

Fig.1

SEM images (×10 000) and diameter distribution of SPES nanofibers with different concentration"

Fig.2

SEM images (×10 000) and fiber diameter distribution of SPES nanofibers with different spinning voltage"

Fig.3

SEM images (×10 000) and diameter distribution of SPES nanofibers with different tip-collector"

Fig.4

SEM images (×10 000) and diameter distribution of SPES nanofibers with different sulfonation degree"

Fig.5

Surface SEM images of SPES/Nafion composite membranes with different sulfonation degree (×2 000)"

Fig.6

Water uptake and swelling ratios of SPES/Nafion membranes at 40 ℃ and 80 ℃"

Fig.7

Stress-strain curves of SPES/Nafion membranes"

Fig.8

Temperature-dependent proton conductivities of SPES/Nafion composite membranes"

Fig.9

Proton conductivity and methanol permeability of SPES/Nafion membranes at 40 ℃"

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