Fuel cell electrode in-situ preparation method based on microporous layer with double-layer ordered structure

Abstract

The invention discloses a fuel cell electrode in-situ preparation method based on a microporous layer with a double-layer ordered structure, and relates to the field of fuel cells, and the method comprises the following steps: treatment of an electrode substrate layer, preparation of a hydrophobic layer, preparation of an ordered hydrophilic layer and in-situ growth of a platinum-based catalyst onthe hydrophilic layer. In the fuel cell electrode prepared by the method, the Pt-based catalyst directly grows on the ordered microporous layer in situ, so that the Pt-based catalyst shows differentforms such as nanowires and nano dendrites, the electrochemical active surface area and the catalyst stability are increased, the transmission resistance between the microporous layer and the catalystlayer is reduced, and the performance of the cell can be effectively improved. Under a low-temperature fuel cell operation condition, the electrode shows more excellent cell performance than a traditional electrode.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an electrode in which a catalyst grows in-situ on a microporous layer with an ordered structure and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency hydrogen energy conversion device, which can directly convert the chemical energy stored in hydrogen fuel and oxidant into electrical energy through electrochemical reaction. It is environmentally friendly, high specific energy, and low temperature. The characteristics of quick start and high smooth operation can be applied to many fields such as new energy vehicles, field mobile power supply and silent power supply. It is considered to be an ideal power source to replace the internal combustion engine, and has received extensive attention and research in recent years. [0003] However, the current research and development of PEMFC still faces problems su...

AI Technical Summary

Problems solved by technology

[0008] Although a pore-forming agent was added in the preparation of the microporous layer, the arrangement of the obtained micropores was not uniform, and the transmission channels of the microporous layer prepared by the spraying method were also in a disordered state.

Most of the Pt catalyst in the catalytic layer is deposited on the surface of the carrier as spherical particles, and many active sites are hidden under the surface, which cannot play a catalytic role. Moreover, during the long-term operation of the battery, the Pt catalyst may agglomerate or fall off, seriously Affects battery performance and durability

In addition, there are two contact interfaces between the support layer (carbon paper or carbon cloth)-microporous layer-catalytic layer, which increases the material transport resistance of the membrane electrode.

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