Abstract

Through-plane water permeation across the membrane is one of the fundamental processes involved in operational PEMFCs. In recent years, water transport resistance at the membrane-gas interface has been reported and is related to relative humidity applied to the membrane. In this study, we investigated variation of surface structure of the membrane under water permeation process by using tapping-mode atomic force microscopy (AFM). AFM results revealed that surface structure of the membrane depends on relative humidity at the both side of the membrane and also suggested that local equilibrium was not necessarily established at the membrane-gas interface under water permeation associated in the membrane.

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