Proposal of new hybrid type gas diffusion layer and measurement of characteristics of oxygen diffusivity in polymer electrolyte fuel cell

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The mass transfer characteristics of the gas diffusion layer (GDL) are closely related to the performance of polymer electrolyte fuel cells. This study investigates the configuration of a new GDL in which two porous media with different wettability are alternately arranged (hybrid GDL). The oxygen diffusivity characteristics with respect to water content (saturation) were measured using an experimental system that employs a galvanic oxygen sensor as an oxygen absorber. As a result, it was confirmed that the enhancement of oxygen diffusivity of the new microporous media was achieved by the proposed new type GDL.