Characterization of Nafion/zirconium sulphophenyl phosphate nanocomposite membrane for direct methanol fuel cells.
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.
Kim
Young-Sang
YS
Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Korea.
Cho
Hyun-Seok
HS
Song
Min-Kyu
MK
Ghil
Li-Jin
LJ
Kang
Jung-Soo
JS
Rhee
Hee-Woo
HW