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Fabrication of a carbon nanofiber sheet as a micro-porous layer for proton exchange membrane fuel cells
Authors:Qiongjuan Duan  Jiong Wang  Yonggen Lu
Affiliation:a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, PR China
b College of Material Science and Engineering, Donghua University, Shanghai 201620, PR China
Abstract:A carbon nanofiber sheet (CNFS) has been prepared by electrospinning, stabilisation and subsequent carbonisation processes. Imaging with scanning electron microscope (SEM) indicates that the CNFS is formed by nonwoven nanofibers with diameters between 400 and 700 nm. The CNFS, with its three-dimensional pores, shows excellent electrical conductivity and hydrophobicity. In addition, it is found that the CNFS can be successfully applied as a micro-porous layer (MPL) in the cathode gas diffusion layer (GDL) of a proton exchange membrane fuel cell (PEMFC). The GDL with the CNFS as a MPL has higher gas permeability than a conventional GDL. Moreover, the resultant cathode GDL exhibits excellent fuel cell performance with a higher peak power density than that of a cathode GDL fabricated with a conventional MPL under the same test condition.
Keywords:Micro-porous layer  Carbon nanofiber sheet  Gas diffusion layer  Proton exchange membrane fuel cell  Electrospinning
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