Fuel cell electrode with catalyst growing on ordered structure microporous layer in situ and preparation method of membrane electrode

Abstract

The invention discloses a fuel cell electrode with a catalyst growing on an ordered structure microporous layer in situ and a preparation method of a membrane electrode, and relates to the field of fuel cells. The fuel cell electrode comprises an electrode substrate layer, a hydrophobic layer, an ordered structure hydrophilic layer and a catalyst, wherein a hydrophobic layer is prepared on the electrode substrate layer, a hydrophilic layer with an ordered structure is prepared on the hydrophobic layer, and catalysts are uniformly distributed on the hydrophilic layer with the ordered structure.According to the invention, the platinum-based catalyst directly grows on the hydrophilic layer with the ordered structure in situ, so that the catalyst shows different morphologies such as nanoparticles, nanowires, nanorods and nano dendrites on the microporous layer, the electrochemical active surface area and catalytic activity are increased, the transmission resistance between the microporouslayer and the catalytic layer is reduced, and the performance of the battery can be effectively improved; in addition, the catalysts with special morphologies such as nanowires, nanorods, nano dendrites and the like have excellent stability, so that the durability of the battery is effectively improved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for preparing a fuel cell electrode and a membrane electrode in which a catalyst grows in-situ on a microporous layer with an ordered structure. 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...

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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