TW201039490A - A method for reducing the catalyst - Google Patents

Abstract

This invent for a fuel cell provide a kind of linear coating method on electrode. The reduction of use for platinum is purpose of this invent. It can provide the use of fewer catalyst to improve the performance for fuel cell. This approach include drying catalyst which is composed of the ratio with platinum/carriers and distributed linearly on the electrode.

Description

201039490 IV. Designated representative map: (1) The representative representative of the case is: ( ). (2) The symbol of the symbol of the representative figure is a brief description: ^/Α The chemical formula: 5. If there is a chemical scale, please reveal the characteristics of the most inventive invention. 6. Description of the invention: Ο ❹ [Technical field of invention] The present invention is 'Electrochemical fuel cells coated with non-carriers formed by the catalyst in different parts, $ metal and its case distribution, in order to effectively reduce the precious metal H, the amount of catalyst to achieve a linear ratio [previous technique] ίΐΐϊίΐ hydrogen by electrification Learning to convert the reaction into electricity. In, the characteristics are: (1) low pollution; (2) high efficiency; _ sound is small. ΐίίΠΐί1 The pool converts the reactants to produce electricity and products: a wide range of reactants can be used in the fuel cell and can be used in a gas stream or stream. For example, the fuel gas stream can be pure hydrogen. The water vapor is a kind of water-based alcohol, such as a direct methanol fuel cell. The gasification agent can be a pure oxygen stream or a diluted oxygen stream. For example, the structure of the battery is generally The basic structure of the layer, the middle gate layer of i, the electrochemical electrochemical reaction of the anode and the cathode, that is, the outer side of the two layers of the catalyst layer is a gas diffusion layer, and most of them are a cloth or carbon paper material with a good row = The reactants of the anode and the cathode are formed via the 2 201039490 to the catalyst layer, and the reaction product is also discharged through the diffusion layer. On the outside of the two diffusion layers, there are two layers of baffles, which are mostly made of carbon plates and metal plates. The composite graphite fiber sheets are processed to have a gas guiding groove adjacent to the diffusion layer side, and the anode and cathode are The reactants and products enter and exit the fuel cell via the two-layer baffles. On the outside of the two-layer baffle, there is a collector plate. The collector plate is mostly a corrosion-resistant metal such as nickel or gold on the copper plate. The collector plate collects electric charge to make the battery charge to the external circuit. The above is the basic structure of the fuel cell unit. The progress of fuel cell current is related to the reaction of hydrogen and oxygen in the crust area. The specific surface area of the catalyst is one of the key points. The larger the specific surface area, the larger the reaction area of the platinum catalyst can provide the same reaction area. When the platinum particle size is reduced, the specific surface area can be increased, and the amount of use can be reduced to reduce the cost. Therefore, various platinum catalyst processes are aimed at targets with small particle size, uniform distribution, and good performance. At present, platinum fine particles have been adsorbed on the carrier for a period of time. The impregnation method, the colloid adsorption method and the sinking method are more commonly used in the production process. The impregnation method first dissolves chloroplatinic acid in water, then adds carbon black, and after the impregnation is completed, the solvent is evaporated to dryness, and then the platinum ion is reduced to metal by hydrogen. In this preparation, the adjustable parameters are the concentration of gas platinum acid, the temperature, and the pH value of the solvent. The colloidal adsorption process, as in patent 4,136,059 ', reduces the chlorinated acid ion with a reducing agent such as sodium sulfite (10) 2 § 2 〇 4) to a platinum colloid and then adsorbs onto the carbon black. Finally, hydrogen peroxide is added to stabilize the dispersion of the platinum. According to the patent production process, the platinum particles produced are around 2 to 5 nm. The process of the precipitation method is as follows: U.S. Patent No. 4, 〇 44, 193, first mixing sodium carbonate, sodium hydrogen sulfite and gas platinum acid to produce a white precipitate N% pt(s〇3)4, and passing the filtered filtrate through the ion. The exchange tube replaces the other three sodium ions with hydrogen ions. In the middle of the steps, you need to adjust the PH value. Then, carbon black ^ hydrogen peroxide is added to complete the preparation. = The method of manufacturing the touch material, the fine carbon powder with the precious metal catalyst is dispersed in an organic solvent or the like to make the ink. Further, by screen printing, printing, and web blade coating, the Wei is uniformly applied to the substrate to form a catalyst layer. 201039490 [Summary of the Invention] In order to observe the battery, the linearity of the battery is compared with that of the weaving pole.

Li, each electrode catalyst layer is formed on the molding surface, and the electrode H has conductive particles carrying at least a catalyst. ί^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The same intra-pixel injection complex machine is ΙϊΖΐ — 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 制 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨 喷墨Or a thin to thick catalyst layer. 〇

[Embodiment] The present invention is described in detail below with reference to a detailed description of the fuel cell of the present invention. In the drawing, the fuel cell of the present invention comprises a polymer electrolyte membrane 101, and an electrolytic catalyst layer 102a, 102b on both sides of the polymer electrolyte membrane 101, and 201039490 is disposed outside the electrode catalyst layers 102a, 102b. The diffusion layers 10a, 3b, 3b, and a baffle (fuel cell) 10 disposed outside the diffusion layers 103a, 103b, and a baffle (oxidant electrode) 104b, and a baffle plate at 104a, 104b There is a 105a, WSb collector plate on the outside to be used as a collector. In the production of the above fuel cell, the electrode catalyst layers 102a and 102b are formed on both sides of the polymer electrolyte membrane 101, and the diffusion layers 1?3a and 1?3b are separately manufactured for use. These layers are then firmly bonded to form a membrane electrode assembly. The electrode catalyst layer may also be formed on the polymer electrolyte membrane side electrodiffusion layers 1〇3a, 1〇3b. Ο As for the polymer electrolyte membrane 101, a perfluorosulfonic acid of a Nafion membrane or a hydrocarbon membrane produced by Hoechst may be used, and a polymer membrane having a functional group having an ionic conductivity, such as a sulfonic acid, may be widely used. a group, a sulfinic acid group, or an acid group. The sensor cell that may be used in the present invention is preferably located on a conductively fractured surface. Therefore, the catalyst to be carried preferably has a finer average secret. Further, (4) the average particle diameter is preferably in the range of 0.5 to 5 nm. If the average particle diameter is less than 〇5, the activity of the particles is high. Difficult to handle; if the average particle size is greater than 5 nm, the surface area of the catalyst is too small, so that the reaction position is lost, so it is possible to have only low activity 0 - conductive carbon, the average particle size is preferably 5 nm to The range of 诵 Nano is well within the range of 10 nm to 100 Nai. In order to make the conductive medium, the specific surface of the conductive carbon is preferably as large as a certain degree, since it has a mass of 200 m2/g to 3000 m2/g^=, the amount of the most catalytic material of the stone is the total weight of the conductive carbon and the catalyst. 5% to 8 (%) of the amount of heavy medium is less than 5% by weight, resulting in _ aeronautical should be = ^ at 8 〇% by weight is not good 'because of the high production cost of the catalyst, it is difficult to deal with the catalyst . 4Production Autumn 5 201039490 A mixture of a solvent, a water, and the like, together with a binder, a polymer electrolyte, a conductive carbon, and the like, and then a catalyst for polymerization can be formed by dispersion, by using a catalyst mixture. Preferred solvents include butyl i, isopropanol, ethyl yeast, decyl alcohol, isobutyl acetate acetate, glycerol, and diethylene glycol drunk in polymer electrolysis (4) / diffusion layer 1 = _ fiber咖乡it t sound s Ο Ο By the front of the nozzle, the ultrasonic is used to make the internal uniformity of the square / = the kind of ink that is not in the county, and the ink is used independently. Within the droplet 100P1, the 'into the layer type is formed into the mother-electrode catalyst layer' and the ejection is repeated, so that it can be determined that each block (four) has another path, that is, the paste jet system can be in the f mode, that is, in the polymerization. On the electrolyte membrane/diffusion layer, the gradient of the catalyst layer 'in the state of the touch-to-proportion is increased or decreased from one end to the other. To use the screen printing, you need to use the photoresist to leave the smear on the screen, and then apply the swatch/carrier separately. When smearing, the knives will be coated and the area will be painted. The proportion of the rebellion is coated according to the above method, that is, a continuous different proportion of catalyst is obtained. After the catalyst was applied to the polymer electrolytic diffusion layer, the box was immediately baked at 70 degrees for 30 minutes. After the anode and the cathode of the polymer electrolysis thief are divided into the yang-yang contact layer and the cathode lining, or the cathode gamma (four) non-domain ruthenium layer is coated with the anode and the cathode catalyst respectively, The electrodes of the finished fine-layer layer are arranged in a two-figure shape for hot pressing, and the hot pressing conditions are 5 〇 1 to 1 〇〇 kgw/cm 2 , and the temperature is 120 to 140 degrees 'the time is 〜 5 minutes. 6 201039490 Description] 101 polymer electrolyte membrane 102a, 102b electrolytic catalyst layer 103a '103b diffusion layer l〇4a fuel electrode deflector l〇4b oxidant electrode deflector l〇5a, 105b collector plate

[Main component symbol description] N/A

Seven, the scope of application for patents: L - kind of fuel cell - the production method of the medium, the oxidant electrode, the polymer electrolyte between the two electrodes:, ^ package of the characteristics of the sensor, the level __ 〗 〖 The inkjet gradient method is used to make the catalyst thickness range. 2. The first item in the patent application range, linear mode.

Applying each coating in a small amount & fractional coating, i. as claimed in the first item of the patent 'The catalyst is applied to the polymer electrolyte or the diffusion layer 50~1〇〇

Claims (1)

201039490 [Simple description of the diagram] 101 polymer electrolyte membrane 102a, 102b electrolytic catalyst layer 103a '103b diffusion layer l〇4a fuel electrode baffle l〇4b oxidant electrode baffle l〇5a, 105b collector plate [mainly Component Symbol Description] N/A Seven, the scope of application for patents: L - kind of fuel cell - the production method of the medium, the oxidant electrode, the polymer electrolyte between the two electrodes:, ^ package of the characteristics of the sensor, the level __ 〗 〖 The inkjet gradient method is used to make the catalyst thickness range. 2. The first item in the patent application range, linear mode. Make each coating indefinite & split coating, i as in the first paragraph of the patent application 'the catalyst is applied to the polymer electrolyte or the diffusion layer 50~1 〇〇 lion lion required hot pressure 201039490 7. The fourth part of the patent application scope, before the hot pressing of the polymer electrolyte, is first immersed in volatile alcohol for 3 minutes. 8. If the first item of the patent application is applied, the image on the printed board is printed with a photoresist to make it conform to the size of the catalyst coating.