A post-treatment method for a porous gas diffusion layer for a fuel cell
A technology of gas diffusion layer and treatment method, which is applied in the field of post-treatment of porous gas diffusion layer, and can solve the problems such as difficulty in grasping the ratio of large pores and small pores, difficult control of pore size, cumbersome preparation method of porous gas diffusion layer, etc., to achieve shrinkage Pore size range, flatness increase, effect of surface flatness increase
Active Publication Date: 2016-08-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
The preparation methods of the above types of porous gas diffusion layers are cumbersome, and the pore size is not easy to control, and the ratio of large pores to small pores is also difficult to grasp.
Method used
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Embodiment
[0031] 1)-4) four steps are the same as comparative example;
[0032] 5) In a flat vulcanizing machine at 120°C, the gas diffusion layer is hot-pressed and leveled, the pressure is controlled at 12MPa, the processing time is 30s, and then it is taken out and cooled. At this time, the thickness of the gas diffusion layer is 0.18mm, and the porosity 40%, the average pore size is 0.025μm, and the pores with a pore size of 0.01-0.05μm account for 74.65% of the total pore volume;
[0033] 6) The gas diffusion layer treated in 5) is hot-pressed with a piece of NF1135 membrane and anode to form a three-in-one membrane electrode, and the hot-pressing conditions are the same as those of the comparative example. figure 2The middle red curve is the discharge performance of the three-in-one membrane electrode (MEA) prepared according to this example under the condition of using hydrogen and air as the reaction gas. It can be seen from the figure that the maximum output power density of ...
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Abstract
The invention relates to a post-processing method of a porous gas diffusion layer for a fuel cell. The porous gas diffusion layer is formed by an electrode support body and a flattening layer, and after processing of heating and pressurizing, the thickness of the porous gas diffusion layer is 0.1-0.2 mm, the void ratio is 20%-80%, and the average pore size is 0.002-0.2 micrometer. Holes with apertures of 0.01-0.05 micrometer occupy 70%-80% of the volume of the total holes. Through adoption of the post-processing method to process the porous gas diffusion layer, the post-processing method has the advantages of improving flatness of electrodes, improving transmission speed of gas and liquid water, reducing damage to strength of a proton exchange membrane or a catalysis membrane, and is particularly suitable for improving the performance of the gas diffusion layer of the fuel cell, and the like.
Description
technical field [0001] The invention relates to a post-treatment method of a porous gas diffusion layer for a fuel cell. Background technique [0002] A fuel cell is a device that directly converts chemical energy into electrical energy. The three-in-one membrane electrode is the core of this device and a place for electrochemical reactions; it generally consists of three parts: a cathode, an anode and a solid polymer electrolyte. Both the cathode and the anode consist of a gas diffusion layer and a catalytic layer. [0003] The output power of the fuel cell is closely related to the structure of the gas diffusion layer. In the fuel cell, the functions of the gas diffusion layer mainly include: providing reaction gas for the three-phase electrochemical reaction that occurs on the catalytic layer; collecting the current of the electrochemical reaction; and discharging the water generated by the electrode reaction. Therefore, the structure, thickness, porosity, and tortuosit...
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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 张华民邱艳玲董明全
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI