▎ 摘　　要

In this work, iron oxide (Fe3O4) nanoparticles are deposited onto sulfonated graphene oxide (SGO) nanosheets using a solvothermal method. By applying a magnetic field on the solution during casting, the SGO/Fe3O4 nanosheets are drawn to the through-plane direction of the membrane. The structures of the nanosheets and membranes are characterized. The aligned poly(vinyl alcohol) (PVA)/SGO/Fe3O4 membrane shows higher proton conductivity, water uptake, thermal stability, methanol permeability, and selectivity compared to a nonaligned membrane. By orientation of nanosheets, 5.7% improvement in the tensile stress of the membranes is observed. The aligned PVA/SGO/Fe3O4 nanocomposite membrane generates the highest power density of 25.57 mW cm(-1) at 30 degrees C. As a result, the aligned PVA/SGO/Fe3O4 nanocomposite membrane appears to be a good candidate for direct methanol fuel cell application.