Fuel cell electrode catalyst layer slurry preparation method, catalyst slurry and application thereof

Abstract

A preparation method of fuel cell electrode catalyst layer slurry comprises the steps that an additive is added in the catalyst slurry pretreatment process, and a filter cake is prepared; in the preparation of the catalyst slurry, water, a low-boiling-point solvent, a high-boiling-point solvent and a high-viscosity solvent are sequentially or simultaneously added into the obtained filter cake respectively, and ultrasonic stirring is performed to obtain catalyst slurry to be treated; the catalyst accounts for 0.5-15% of the mass of the catalyst slurry; the obtained catalyst slurry to be treatedis sufficiently stirred in an inert atmosphere forstanding, supernatant is removed, and repeatedly filtering is performed until the slurry is fine and uniform; and stirring is performed again to obtain catalyst slurry. The slurry prepared by adopting the method is good in uniformity, high in stability, wide in adjustable range of viscosity and viscoelasticity and high in practicability, components in the slurry can be adjusted according to requirements of application targets, the applicable range is wide, and the slurry can be applied to various electrode systems.

Description

technical field [0001] The invention relates to a catalyst slurry preparation method suitable for fuel cell membrane electrodes, in particular to a slurry preparation method that can be used to prepare fuel cell gas diffusion electrodes or solid electrolyte membrane-carrying catalytic layer electrodes by coating methods. [0002] The present invention also relates to the application of the method for preparing the above-mentioned thermal catalyst slurry. Background technique [0003] In recent years, the development of new clean energy, the rational use of existing energy and the coordinated development of environmental protection have become the basis for the development of the world economy in this century. Fuel cells (Fuel Cells) are a power generation device that directly converts chemical energy into electrical energy without a combustion process. It has the outstanding advantages of high energy conversion efficiency, low pollution, and environmental friendliness. Powe...

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Problems solved by technology

The current research on MEA shows that its existing problems are mainly concentrated in: the structure of the electrode catalytic layer and the gas diffusion layer is unreasonable, resulting in low catalyst utilization, high transfer resistance of reaction gas and liquid water, and extreme concentration difference in the high current density area. Large chemical loss; battery output performance needs to be improved; electrode preparation process is cumbersome and the degree of automation is not high, it is difficult to achieve large-scale mass production

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