Direct liquid fuel cells have attracted intensive research because of the promised application in Portable Fuel Cell Systems. Liquid fuel crossover through the proton exchange membranes (PEMs, e.g. Nafion™ membrane) is one of the major obstacles that currently prevent the widespread commercial applications of direct liquid fuel cell. In this paper, PEMs constructed by self-assembling metal nanoparticles on Nafion™ membranes were prepared to probe the crossover behaviors. The results show that the fuel crossover has a remarkable decrease comparing with the original PEMs. This satisfactory performance gives the self-assembled PEMs a promised prospect in direct liquid fuel cells.

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