Synthesis of novel crosslinked sulfonated poly(ether sulfone)s using bisazide and their properties for fuel cell application

Building bridges: Crosslinking of sulfonated aromatic polymers—A review

“…Based on this idea, Oh et al recently designed and prepared XL sulfonated poly(ether sulfone) membranes for fuel cell applications [98,99]. Unprecedentedly, as-synthesized crosslinked membranes exhibited in-plane proton conductivity as high as 0.79 S/cm at 100% relative humidity and 100 1C.…”

Novel hybrid polymer electrolyte membranes with high proton conductivity prepared by a silane-crosslinking technique for direct methanol fuel cells

“…After a crosslinking treatment, the polymer matrix forms a network where the macromolecular chain of polyelectrolyte is immobilized and compacted [16][17][18][19]. Plenty of work has been done to use the cross-linking method in the area of PEMs to reduce the methanol crossover successfully for DMFCs [20][21][22]. However, in most of these cases, proton conductivity decreased significantly due to diminishing the free protons of conductive materials or the addition of non-conductive materials.…”

Reactive & Efficient: Organic Azides as Cross-Linkers in Material Sciences

“…Compared to Nafion ® -112 (σ= 0.48 S/cm), the crosslinked membrane had an excellent proton conductivity of 0.79 S/cm at 100 • C and a much lower methanol permeability of 5.2 × 10 −7 cm 2 s −1 , corresponding to only 17% of that of Nafion ® . The membrane withstood oxidation by Fenton's reagent for up to 4 h compared to around 3 h for the non-crosslinked version [75,76]. The same bisazide was also tested in combination with a poly(fluorenyl ether sulfone) polymer, resulting in lower proton conductivity of 0.38 S/cm at 100 • C, but also even lower methanol permeability of 3.9 × 10 −8 cm 2 /s.…”