Preparation method of proton exchange membrane fuel cell catalyst

Abstract

The invention discloses a preparation method of a proton exchange membrane fuel cell catalyst. The preparation method is characterized by comprising the following steps of: refluxing a sp2-hybridized carbon nanomaterial through concentrated HNO3, washing, drying in vacuum, calcining and purifying; performing plasma surface functionalization on the purified sp2-hybridized carbon nanomaterial by plasma discharge; and adding the sp2-hybridized carbon nanomaterial into reducer-containing solution and metal salt precursor solution in a strongly alkaline inert atmosphere for a reduction reaction so as to obtain the proton exchange membrane fuel cell catalyst. The preparation method has the advantages that: high-density uniformly-distributed surface functional groups can be produced on the surface of the carbon nanomaterial, the structure of the carbon nanomaterial is prevented from being damaged, migration of electrons between metal nanoparticles and the sp2-hybridized carbon nanomaterial is prevented from being obstructed and high electro-catalysis performance is kept.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a method for preparing a proton exchange membrane fuel cell catalyst. Background technique [0002] A fuel cell (Fuel Cell) is a device that directly converts the chemical energy of fuel (such as hydrogen, methanol) and oxidant (oxygen, air) into electrical energy. Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell. Because of its advantages of high energy conversion efficiency, clean and pollution-free, and fast startup at room temperature, it has become an ideal power source for mobile power sources, especially electric vehicle power sources. . Catalyst is the key material of proton exchange membrane fuel cells, its stability and activity are important factors restricting the development and commercialization of proton exchange membrane fuel cells. [0003] Most of the electrocatalysts widely used in traditional proton exchange membrane fuel cells are metal / carbon composite elect...

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Problems solved by technology

[0007]3) Due to the adsorption of surfactants on sp2 hybridized carbon nanomaterials or supramolecular complexation with proteins and macromolecules, it is easy to cause metal nanoparticles and The direct contact of sp2-hybridized carbon nanomaterials is hindered, which further hinders the transfer of electrons between metal nanoparticles and sp2-hybridized carbon nanomaterials

[0008]Therefore, these surface modification methods usually lead to a decrease in the partial conductivity of the sp2 hybridized carbon nanomaterial carbon-based support or hinder the formation of metal nanoparticles and sp2 hybridization. The transfer of electrons between carbon nanomaterials, resulting in the decline of the electrocatalytic performance of the resulting metal particle / sp2 hybrid carbon nanomaterial composite catalyst

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