A coating method and battery of a carbon carrier material loaded with a metal catalyst

Abstract

The invention relates to a coating method of a carbon carrier material loading a metallic catalyst and a battery. The method comprises steps of putting carbon carrier material powder loading the metallic catalyst in a porous container, and vacuumizing a reaction chamber and filling the porous container with CO or H2; coating the reacted carbon carrier material organically and / or inorganically; andannealing the coated carbon carrier material powder in H2 atmosphere. CO or H2 has high adsorption capacity on surfaces of metallic catalysts like Pt and Pb, may causing catalyst poisoning and deactivation; in ALD and MLD, interaction with CO or H2 fails, so that the surface of the metallic catalyst cannot be coated, but the surface of carbon can be coated, then high temperature annealing is performed in H2 atmosphere to remove CO or H2 from the surface of the catalyst, and then the catalyst is reactivated. The coating layer obtained by the method can effectively cover a defect position easyto be oxidized on the surface of carbon powder, but does not coat the surface of the metallic catalyst, thereby achieving a goal of resisting oxidization but not affecting catalysis performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for coating a carbon support material loaded with a metal catalyst and a battery. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an electrochemical energy conversion device that directly converts chemical energy in hydrogen and oxygen into electrical energy. It has high energy conversion efficiency, is environmentally friendly, and emits almost no nitrogen oxides and sulfur oxides. It is considered to be one of the preferred clean and efficient power generation technologies in the future. At present, PEMFC cathode oxygen reduction catalysts are mainly commercial Pt / C catalysts. However, during the actual operation of the fuel cell, extreme environments such as high humidification, low pH value and high potential can lead to electrochemical corrosion of the carbon support material in the catalyst, which further leads to the migration, loss ...

AI Technical Summary

Problems solved by technology

However, due to the strong acidity, high potential, high humidity and high temperature of the internal environment, the metal-containing layer will still be corroded slowly, resulting in catalyst shedding and other phenomena.

Patent CN108807855A proposes to use ALD first and then MLD coating, but because the Pt catalyst surface has some defects more or less, it will cause part of the catalyst surface to be coated, resulting in a decrease in catalyst activity

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