Porous carbon-loaded monatomic metal nitrogen coordination composite material and preparation method thereof

Abstract

The invention discloses a porous carbon loaded monatomic metal nitrogen coordination composite material and a preparation method thereof. In the composite material, metal is fixed on a porous carbon carrier in an atomic-scale dispersed metal nitrogen coordination form. The preparation method comprises the following steps: (1) adsorbing a metal salt and a complex by using porous carbon to obtain aprecursor; and (2) physically grinding the precursor and a nitrogen source, and carrying out heat treatment in an inert atmosphere. The preparation method is low in cost, simple in process, clear in product, high in loading capacity, good in stability and suitable for large-scale production, and metal is dispersed in an atomic scale. In addition, the porous carbon loaded monatomic metal nitrogen coordination composite material has excellent catalytic performance in oxygen reduction, carbon dioxide reduction and nitrogen reduction reactions, and is obviously superior to other reported catalystsof the same type.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a porous carbon-supported monoatomic metal nitrogen coordination composite material and a preparation method thereof. Background technique [0002] Because single-atom materials have the advantages of both homogeneous catalysis and heterogeneous catalysis, and also make up the difference between the two, they have attracted much attention in recent years. Compared with heterogeneous materials, single-atom materials maximize the utilization of atoms, and the uniform active sites with tunable electronic structures are conducive to the improvement of catalytic activity and selectivity, while having excellent stability different from homogeneous catalysts. and circularity. In the past few years, a large number of single-atom catalysts have been used in thermocatalytic reactions (such as carbon monoxide oxidation, water gas shift reaction and methan...

AI Technical Summary

Problems solved by technology

However, there are still challenges in the controllable preparation of single-atom catalysts: 1. Due to the high surface energy of single atoms and thermodynamic instability, active single atoms tend to move and agglomerate to form clusters or nanostructures during the preparation process or subsequent application. particles

2. Single-atom catalysts usually have high activity and high selectivity, but their catalytic stability still needs to be improved

However, these methods generally have disadvantages such as low loading capacity and poor stability of the prepared single-atom materials.

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