466840 Membrane Electrolytes with Magnetic Field Aligned Graphene Oxide Nanosheets for Alkaline Fuel Cells

Monday, November 14, 2016: 5:23 PM
Plaza B (Hilton San Francisco Union Square)
Shingjiang Jessie Lue, Chemical and Materials Engineering, Chang Gung University, Kwei-shan, Taoyuan, Taiwan

This study aims to elucidate the magnetic graphene oxide (GO) nanofiller alignment in polymer matrix on the resulting films’ ionic conduction and methanol barrier properties. Magnetic iron oxide (Fe3O4) nanoparticles were fabricated and decorated onto the GO nanosheets. The magnetic GO-Fe3O4 nanofillers were mixed with quaternized polyvinyl alcohol (QPVA) to form polymer composite. By applying magnetic field on parallel sides along in-plane direction during drying and film formation step, the GO-Fe3O4 nanosheets were aligned in an orientation parallel to the direction of magnetic field and connected each other into elongated domains. The QPVA composite membranes were doped with alkali to become hydroxide-conducting electrolytes for direct methanol fuel cell application. The magnetic field-aligned QPVA/GO-Fe3O4 membrane showed higher ionic conductivity and lower methanol permeability compared to nonaligned QPVA/GO-Fe3O4 membrane. The aligned QPVA/GO-Fe3O4 composite exhibited a peak power density of 172.4 mW cm-2 at 60°C, 35.6% higher than that without magnetic field treatment.

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See more of this Session: Fuel Cell Membranes
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