Nanofiber-based polyelectrolytes as novel membranes for fuel cell applications

作者：Shabani Iman; Hasani Sadrabadi Mohammad Mahdi; Haddadi Asl Vahid^*; Soleimani Masoud

来源：Journal of Membrane Science, 2011, 368(1-2): 233-240.

DOI：10.1016/j.memsci.2010.11.048

• Nanofiber
• Electrospinning
• Bilayer membrane
• Polyelectrolyte
• Fuel cell

Partially sulfonated poly(ether sulfone) (SPES) was prepared and electrospun to bead-free nanofibers. The obtained data from solution conductivity measurements and scanning electron microscopy illustrated that sulfonation leads to a drastic increase in polymer solution conductivity and a considerable decrease in nanofiber diameter and a narrower diameter distribution. The new types of membranes were fabricated using Nafion-filled electrospun mats. The porous SPES nanofibrous membranes were impregnated with appropriate amount of Nafion solution. After a good pore-filling, an excess amount of Nafion solution was used to form a uniform top layer (SPES-N-N). Another bilayer polyelectrolyte membrane was prepared by direct electrospinning of SPES nanofibers on Nafion112 membrane's surface and followed by impregnation of Nafion solution into the pores of electrospun SPES (SPES-N-N112). The membranes were characterized by methanol permeability, proton conductivity, oxidative/hydrolytic stability as well as single cell direct methanol fuel cell (DMFC) performance tests. The proton to methanol selectivity of the SPES nanofiber-based bilayer membranes is about 53,680 and 45,500S s cm(-3) for SPES-N-N and SPES-N-N112 in comparison with 28,300 and 40,500S s cm(-3) for Nafion112 and Nafion117, respectively. The single cell DMFC performance results revealed that the SPES nanofiber-based-bilayer membranes have higher electrochemical performance than Nafion112 and Nafion117 membranes especially in elevated methanol concentration.

• 出版日期2011-2-15