Patent ID: 8911919

Claim:
A method of manufacturing a local hydrophilic gas diffusion layer configured to receive a clamping pressure of a fuel cell stack from a separator including a pair of lands that form a gas channel, the method comprising: subjecting only a first region under each land of the separator which receives the clamping pressure to a hydrophilic treatment by: using the separator as a first electrode which is connected to the local hydrophilic gas diffusion layer, providing a second electrode at the opposite side of the first electrode, and performing the hydrophilic treatment only on the first region under each land by applying an alternating current to water or steam only in the first region of the gas diffusion layer through the pair of lands of the separator when the pair of lands of the separator is stacked on the first region of the gas diffusion layer, wherein the first region receives the clamping pressure from the pair of the lands formed on the separator; and forming the local hydrophilic gas diffusion layer where the first region is hydrophilic and the second region is hydrophobic.