Gas diffusion layer for fuel cell, method for manufacturing said layer, membrane-electrode assembly, and fuel cell
A gas diffusion layer and fuel cell technology, which is used in fuel cell parts, fuel cells, battery electrodes, etc. to improve air permeability and power generation performance.
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no. 1 approach
[0060] use figure 1 , the basic configuration of the fuel cell described in the embodiment will be described. figure 1 It is a schematic perspective view of the polymer electrolyte fuel cell stack according to the embodiment. It should be noted that this embodiment is not limited to polymer electrolyte fuel cells, but can be applied to various fuel cells.
[0061] Such as figure 1 As shown, the fuel cell is formed by stacking a plurality of battery cells 10 as a basic unit, and fastening (connecting) them with a specific load from both sides with current collector plates 11 , insulating plates 12 , and end plates 13 .
[0062] The current collector plate 11 is made of an air-impermeable conductive material such as copper or brass. The current collector plate 11 is provided with a current extraction terminal portion, from which current is extracted during power generation.
[0063] For the insulating plate 12, an insulating resin such as fluorine-based resin, PPS resin, or ...
no. 2 approach
[0138] The fuel cell according to the second embodiment of the present invention will be described. The gas diffusion layer 3 is different from the first embodiment 1 . The gas diffusion layer 3 of the second embodiment differs from the gas diffusion layer 3 of the above-mentioned first embodiment in that a fluid channel 5 is formed on one surface of the gas diffusion layer 3 . The other points are the same as those of the above-mentioned first embodiment, so repeated explanations will be omitted, and the differences will be mainly described.
[0139] The basic configuration of the fuel cell described in the second embodiment is the same as that in the first embodiment, and thus description thereof will be omitted. Items not described are the same as those in Embodiment 1.
[0140] Next, the configuration of the battery unit 10 described in the second embodiment will be described in detail. Figure 8 is a cross-sectional view of the battery cell 10 .
[0141] The battery c...
Embodiment 1～6
[0168] Regarding the composition ratio of the gas diffusion layer 3 , acetylene black, Ketjen black, artificial graphite, VGCF, PTFE, and fumaric acid (pore former) were set to the composition ratios shown in Table 1. By the production method of the first embodiment, the gas diffusion layer 3 having a thickness of 200 μm and the above composition ratio was produced.
[0169] The porosity, the average pore diameter, the number of pores with a diameter of 1 μm to 200 μm, the area ratio of the pores to the total area, the air permeability (Gurley number), and the thickness direction of the gas diffusion layer 3 were measured. resistance.
[0170] The results are shown in Table 1.
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