抄録
The influence of GDL (Gas Diffusion Layer) on the PEFC (Polymer Electrolyte Fuel Cell) performance varies greatly depending on gas humidity condition. Under moderate humidity condition, the higher performance can be obtained when using the GDL with no treatment rather than MPL coating. This is because the GDL with no treatment has higher air permeability, compared with MPL coating, thereby reducing the concentration over voltage. Under high humidity condition, on the other hand, the PEFC performance obtained for the GDL with PTFE-hydrophobic treatment is higher than that with no treatment. Further improvement can be obtained with PTFE treatment followed by MPL coating with a carbon black and PTFE. The MPL coating is effective in reducing flooding on electrode, thereby decreasing the concentration over voltage. The reduction of flooding with the MPL coating is enhanced by increasing porosity of the carbon paper substrate.
