Preparation method of tubular metal catalyst

Abstract

The invention discloses a preparation method of tubular metal catalyst comprising dissolving metal salt and sodium nitrate in dimethyl sulfoxide to obtain mixed solution; taking aluminum oxide porous template with nano path as template, conducting electrochemical deposition of the mixed solution at the nano path, and removing the template to obtain the tubular metal catalyst. The invention takes polar aprotic solvent dimethyl sulfoxide (DMSO) as solvent and electrolyte, since DMSO contains S group with weak absorption effect to metal surface, when metal is reduced to particles, DMSO moleculeswill absorb on the particle surface to inhibit the particle from growing large to make the prepared tubular metal catalyst wall thin and to increase the activated area. Furthermore, DMSO with relatively wide electrochemical window, high dielectric constant and high viscosity can ensure the prepared tubular metal catalyst wall is thin and made of particles, the length diameter ratio is high and the wall is uniform.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing a tubular metal catalyst. Background technique [0002] As the world's population grows, humans are often limited by the ability to supply electrical energy to support their activities. Fuel cells can convert chemical raw materials such as hydrogen and oxygen into electrical energy, thus providing a solution to ensure the supply of electrical energy, that is, fuel cells directly convert chemical energy into electrical energy, under the action of metal catalysts, hydrogen, etc. The fuel, air (oxygen) acts as an oxidant to generate electricity and a small amount of heat. Moreover, the product discharged after the fuel cell generates electric energy is water, which meets the requirements of environmental protection and solves the inherent pollution problem of the combustion process. Therefore, the fuel cell can be widely used in the fields of electric ener...

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Problems solved by technology

However, the methods reported above all have the following problems, that is, the more active precursor template Ag, Se and Te and other toxic metal materials are consumed, and the method is complicated and difficult to control.

[0004] Template electrochemical method is another important method for synthesizing tubular metal catalysts. For example, German "Advanced Functional Materials" (Advanced Materials, 16 issue 1550 pages in 2004) reported the use of multi-step template method to synthesize platinum nanotubes, but this The synthesis method is extremely complicated and the cost is high, which limits its application

"Electrochemistry Communications" (Electrochemistry Communications, No. 11, 2009, page 190) reported the use of direct electrochemical methods to synthesize platinum nanotubes in aqueous solution. However, due to the high standard electrode potential of noble metals, they are easily reduced in aqueous solution. The obtained platinum nanotubes have thick walls, which limits their application in the field of catalysts

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