Article ID Journal Published Year Pages File Type
1283704 Journal of Power Sources 2016 7 Pages PDF
Abstract

•A composite membrane consisting of monolayer graphene is proposed for DMFCs.•The methanol permeability through the membrane is demonstrated to decrease by 68%.•The membrane enables a passive DMFC to operate with highly concentrated solutions.

Methanol crossover due to the low selectivity of proton exchange membranes is a long-standing issue in direct methanol fuel cell technology. Here we attempt to address this issue by designing a composite membrane fabricated by sandwiching a monolayer graphene between two thin Nafion membranes to take advantage of monolayer graphene's selective permeability to only protons. The methanol permeability of the present membrane is demonstrated to have a 68.6% decrease in comparison to that of the pristine Nafion membrane. The test in a passive direct methanol fuel cell (DMFC) shows that the designed membrane retains high proton conductivity while substantially suppressing methanol crossover. As a result, the present membrane enables the passive DMFC to exhibit a decent performance even at a methanol concentration as high as 10.0 M.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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