Method for manufacturing solid electrolyte membrane electrode

A solid electrolyte membrane and solid electrolyte technology, applied in solid electrolyte fuel cells, battery electrodes, electrolysis process, etc., can solve the problems of increased catalyst utilization, low catalyst utilization, fuel diffusion loss, etc., to achieve excellent stability, The effect of increasing the electrochemical reaction area and improving the utilization rate

Inactive Publication Date: 2008-08-27
TSINGHUA UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low catalyst utilization rate, fuel diffusion loss, poor stability and short life when the traditional hot pressing method and transfer method used to prepare membrane electrodes for fuel cells, electrolyzers or renewable fuel cells, etc. The electrode structure is more optimized, the catalyst and the membrane are combined more closely, so as to increase the utilization rate of the catalyst, increase the bonding strength of the membrane electrode assembly, and achieve the purpose of improving the electrochemical performance of the membrane electrode

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  • Method for manufacturing solid electrolyte membrane electrode
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preparation example Construction

[0022] A kind of preparation method of solid electrolyte membrane electrode provided by the present invention, its specific process steps are as follows:

[0023] 1) Preparation of a solution or mixture of solid electrolyte materials: mixing the solid electrolyte material and a dispersant to prepare a mixture or solution with a mass percentage of 0.1%-70%, wherein the dispersant is water, ethanol or isopropanol; the The solid electrolyte membrane material is an inorganic solid ion exchange material or an organic ion exchange material or an inorganic and organic doped composite material.

[0024] 2) Use a spray pen or spray gun dispersion equipment to spray the mixture or solution evenly on both sides of the solid electrolyte membrane to form a solid electrolyte membrane loaded with solid electrolyte materials; when spraying with a spray gun or spray gun, the relative pressure of the gas is controlled at 0.1- Between 1.0MPa; spraying speed is 0.02-500ml.min -1 .cm -2 . The t...

Embodiment 1

[0031] Weigh a perfluorosulfonic acid resin solution with a mass percent content of 5%, add a certain amount of isopropanol and a small amount of water, and mix uniformly by ultrasonic to prepare a perfluorosulfonic acid resin solution with a mass percent content of 0.1%. The spray gun uses nitrogen with a relative pressure of 0.1MPa as the carrier gas, and takes 0.1ml.min -1 .cm -2 The speed is sprayed on the proton exchange membrane with a thickness of 50 microns, and the control load is 0.6mg / cm 2 . The weighed Pt / C (40%) catalyst, 5% perfluorosulfonic acid resin and isopropanol make the mass ratio of Pt / C catalyst: perfluorosulfonic acid resin: isopropanol 1: 10: 500, ultrasonic Shake for 8 minutes to form the catalyst solution to be sprayed, take 1.000g of the solution in 500ml.min -1 .cm -2 Spray-coated on the proton exchange membrane with perfluorosulfonic acid resin layers on both sides, at the same time, soak commercial carbon paper in 30% PTFE emulsion for 1 minu...

Embodiment 2

[0033] Weigh 0.500g of Pt / C (containing 40%Pt) catalyst, 1.000g of 5% perfluorosulfonic acid resin and 1.000g of isopropanol solution, so that Pt / C catalyst: perfluorosulfonic acid resin: isopropanol The mass ratio is 1:0.1:2. Ultrasound for 8 minutes to form a catalyst ink-like substance to be sprayed, use a spray pen with air at a relative pressure of 0.1MPa as the carrier gas, and use 0.02ml.min -1 .cm -2 The speed is directly sprayed on the proton exchange membrane with a thickness of 25 microns. At the same time, commercialized carbon paper was soaked in 20% PTFE emulsion for 5 minutes, and then placed in a 340°C muffle furnace for sintering for 60 minutes to form hydrophobic carbon paper, and the carbon powder paste containing 20% ​​PTFE was coated on On the carbon paper with hydrophobic treatment, the coating carbon powder load is 1.0mg / cm 2 , and finally the gas diffusion layer coated with carbon powder and the proton exchange membrane sprayed with a perfluorosulfon...

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Abstract

The invention relates to a method for preparing solid electrolyte membrane electrodes and relates to a method for preparing membrane electrodes in the electrochemical industry filed. The method comprises following steps: firstly, spraying mixture or solution of solid electrolyte materials and disperser with certain load on solid electrolyte membrane which is pre-processed, controlling the load range of the solid electrolyte materials to be 0-0.5mg / cm2, then, configuring catalyst layer mixture or the solution into slurry according to certain ratio of catalyst: the solid electrolyte materials: the dispersant, spraying the slurry on two sides of the solid electrolyte membrane to form a triad component, and then hot-pressing a diffusion layer which is pre-processed with the triad component to form a five-subtest membrane electrode component with the diffusion layer under the condition of 80DEG C to 650DEG C and 0-500kg / cm2. The method of the invention can manufacture multi-functional membrane electrode multi-layer components according to different demands, the technique is convenient and rapid, the catalyst layer and the electrolyte membrane are combined compactly and solidly, and the method has the effects of high availability ratio of the catalyst, good stability and long service life.

Description

technical field [0001] The invention relates to a preparation method of a solid electrolyte membrane electrode, and relates to the multilayer structure, preparation process and the like of the solid electrolyte membrane electrode in the electrochemical industry. The membrane electrode preparation method is suitable for proton exchange membrane fuel cell (PEMFC), direct methanol fuel cell (DMFC), alkaline fuel cell (AFC), solid oxide fuel cell (SOFC), molten carbonate fuel cell (MCFC) As well as the preparation of membrane electrodes for electrochemical devices such as electrolytic water hydrogen production devices and regenerative fuel cells (RFC). Background technique [0002] As an efficient and environmentally friendly power generation device that directly converts chemical energy into electrical energy through electrochemical reactions, fuel cells have broad application prospects in small and medium-sized power stations, electric vehicles, and portable power supplies. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/10H01M4/88H01M8/10C25B9/23H01M8/1004
CPCY02E60/522Y02P70/50Y02E60/50
Inventor 王诚吴海军刘志祥毛宗强
Owner TSINGHUA UNIV
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