title: Characterization of Nafion/zirconium sulphophenyl phosphate nanocomposite membrane for direct methanol fuel cells.
abstract: Layered structure zirconium sulphophenyl phosphate (ZrSPP) was prepared from the precipitation of Zr4+ ion and m-sulphophenyl phosphonic (SPP) acid at a mole ratio of P to Zr = 2.0. The reflective index measurement indicated that the methanol permeability of unmodified Nafion 117 was 2.3 x 10(-6) cm2/s at RT while that of the Nafion/ZrSPP membrane (approximately 50 micro/m thick) decreased to 6.5 x 10(-7) cm2/s. Nafion/ZrSPP (10 wt%) nanocomposite membranes delivered constant power output 104 mW/cm2 at 0.4 V under 1 M MeOH/dry air at 70 degrees C even in the wide range of air stoichiometry from 1.5 to 3.0.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Korea.
authors.forename: Young-Sang
authors.initials: YS
authors.lastname: Kim
authors.forename: Hyun-Seok
authors.initials: HS
authors.lastname: Cho
authors.forename: Min-Kyu
authors.initials: MK
authors.lastname: Song
authors.forename: Li-Jin
authors.initials: LJ
authors.lastname: Ghil
authors.forename: Jung-Soo
authors.initials: JS
authors.lastname: Kang
authors.forename: Hee-Woo
authors.initials: HW
authors.lastname: Rhee