Polybenzimidazole composite membranes having imidazole functionalized graphene oxide showing high proton conductivity and improved physicochemical properties
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초록
내용
Polybenzimidazole composite membranes are fabricated using imidazole functionalized graphene oxide (ImGO) as a filler material for high temperature proton exchange membrane fuel cell applications. Through the reaction of o-phenylenediamine with graphen oxide (GO), ImGO is prepared. The PBI composite membrane having ImGO exhibits improved physiochemical properties and larger proton conductivity compared with the pure PBI and PBI composite membrane having GO because of the better compatibility of ImGO with PBI matrix. For example, PBI composite membrane having 0.5 wt% of ImGO shows enhanced tensile strength (219.2 MPa) with minimal decrease of elongation at break value (28.8%) compared with PBI composite membrane having 0.5 wt% of GO (215.5 MPa, 15.4%) and pure PBI membrane without any filler (181.0 MPa, 34.8%). The proton conductivity of this membrane, at 150 ℃ under anhydrous condition, is 77.52 mS cm-1.