GAS DIFFUSION LAYER FOR FUEL CELL AND MANUFACTURING METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a gas diffusion layer in which adhesion of a first conductive layer and a second conductive layer is excellent, and variation of film thickness of each conductive layer is suppressed.

SOLUTION: The gas diffusion layer for fuel cell is composed of a laminate including the first conductive layer and the second conductive layer. The first conductive layer includes at least conductive carbon particles and high molecular weight polymer having a glass-transition temperature of -30 to 220°C, and the second conductive layer includes at least a conductive carbon material and high molecular weight polymer having a glass-transition temperature of -30 to 220°C. The gas diffusion layer for fuel cell satisfies at least either of conditions of [the high molecular weight polymer in the first conductive layer has larger concentration in a surface contacting the second conductive layer than a surface not contacting the second conductive layer] and [the high molecular weight polymer in the second conductive layer has larger concentration in a surface contacting the first conductive layer than a surface not contacting the first conductive layer].

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