Nitrogen-doped graphdiyne riveted transition metal monatomic catalyst as well as preparation method and application thereof

Abstract

The invention discloses a nitrogen-doped graphdiyne riveted transition metal monatomic catalyst as well as a preparation method and application thereof. According to the catalyst, nitrogen atoms are doped in a novel carbon material graphdiyne carrier, transition metal single atoms are riveted on the surface of nitrogen-doped graphdiyne through the covalent effect between the transition metal single atoms and N and C atoms, and thus transition metal is uniformly dispersed on the surface of the nitrogen-doped graphdiyne in a single atom form to form the catalyst. Transition metal atoms in the catalyst are uniformly dispersed on the surface of the nitrogen-graphdiyne-based catalyst in a single atom state, a large number of active sites are provided for oxidation-reduction reaction, graphdiyneis adopted as a carbon substrate and has excellent morphological characteristics, formation of catalytic active sites is facilitated, and catalytic advantages of single atoms are brought into play. The catalyst disclosed by the invention has high electrocatalytic activity on oxygen reduction under an alkaline condition, is simple and effective in preparation process, low in cost and easy to popularize and put into production, and has important significance in the field of fuel cell development and application.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and electrocatalyst, and in particular relates to a preparation method of a fuel cell cathode catalyst, in particular to a nitrogen-doped graphyne riveted transition metal single-atom catalyst and its preparation method and application. Background technique [0002] Because of its superior performance and environmental friendliness, cleanliness and non-pollution, fuel cells have shown outstanding advantages in various types of batteries. It can directly convert chemical energy into electrical energy and has a very high fuel utilization rate. It has always been a hot spot in the field of energy research. hotspot. Oxygen reduction reaction (ORR) is the first reduction reaction of fuel cells and one of the important basic reactions in living organisms. However, due to its slow reaction kinetics and complicated reaction steps, it is necessary to select a suitable catalyst to improve its rea...

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Problems solved by technology

The study found that the nitrogen in the catalyst can coordinate with the transition metal atoms to form a TM-N structure, and these TM-N structures are the catalytic active sites of the TM-N-C catalyst. When the size of the metal particle is reduced to the atomic size, its specific surface area and surface The energy will be multiplied, and it is very easy to agglomerate to form large clusters in the process of preparation and reaction, resulting in low atom utilization, which leads to a decrease in catalyst activity and limits the activity of non-noble metal catalysts.

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