Preparation method of nitrogen-doped three-dimensional graphene-based fuel cell cathode catalyst

Abstract

The invention discloses a preparation method of a nitrogen-doped three-dimensional graphene-based fuel cell cathode catalyst. The method comprises the steps of 1, uniformly dispersing graphene oxide,a carbon source and sodium dodecyl sulfate in deionized water for carrying out a hydrothermal reaction, and carrying out washing and drying to obtain a three-dimensional graphene material; and 2, uniformly mixing the three-dimensional graphene material with a nitrogen source and potassium hydroxide, and carrying out high-temperature carbonization, cooling, washing and drying to obtain the nitrogen-doped three-dimensional graphene-based fuel cell cathode catalyst. The carbon source and the graphene oxide are compounded, and amorphous carbon generated by the carbon source is uniformly loaded ongraphene sheet layers, so that stacking agglomeration among the graphene sheet layers is prevented; and the three-dimensional graphene material with a large number of multi-level pore channels is obtained, so that nitrogen atoms can enter a skeleton of the three-dimensional graphene material to be doped to form a catalytic activity center, the number of catalytic active centers is increased, and the catalytic performance of the nitrogen-doped three-dimensional graphene-based fuel cell cathode catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of a nitrogen-doped three-dimensional graphene-based fuel cell cathode catalyst. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy contained in fuel into electrical energy. Due to its high energy conversion efficiency, environmental protection, and good maintainability, it is known as the first after water power, fire power and nuclear power. For fourth-generation power generation devices, however, the oxygen reduction reaction (ORR) kinetics of the cathode is much slower than that of the anode, so a large amount of catalysts are needed to catalyze ORR. At present, platinum-based catalysts are still the first choice, but due to the expensive metal platinum, low reserves and Platinum-based catalysts have poor stability and methanol resistance, which restricts the l...

AI Technical Summary

Problems solved by technology

However, graphene in nitrogen-doped graphene-based catalysts is mostly two-dimensional graphene, and two-dimensional graphene often interacts through π-π bonds, and there are a large number of dangling bonds at the edge, which makes the material easy to aggregate and stack during the nitrogen doping process. It is not conducive to the entry of nitrogen atoms into the graphene framework, hindering a large number of catalytic sites on graphene, thus providing limited active centers, and the lack of mass transfer channels leads to reduced catalytic performance

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