Preparation method of MOF-derived high-activity Ni single-atom oxygen reduction reaction electrocatalyst

Abstract

The invention provides a preparation process adopting an MOF-derived high-activity Ni single atom as an efficient oxygen reduction reaction (ORR) electrocatalyst, and introduces the application of the MOF-derived high-activity Ni single atom in electrocatalysis. Zinc nitrate, nickel acetate and dimethylimidazole are taken as raw materials, and a regular dodecahedron MOF-based nano composite material is prepared with zinc adopted as a metal ligand and dimethylimidazole adopted as an organic ligand on the basis of an anisotropic growth principle at normal temperature; and heat treatment is carried out to obtain the regular icosahedron carbon loaded Ni single-atom ORR electrocatalyst with a perfect structure. The catalyst is carbon-loaded monatomic Ni, a carbon carrier is of a dodecahedron structure, the structure size of the carbon carrier is about 25 nm, and metal Ni is dispersed in the carbon carrier in a monatomic form; the catalyst has a very high specific surface area and a very small particle size, which is beneficial to increase of the contact area between an electrolyte solution and oxygen and is beneficial to transmission and diffusion of an electrolyte solution / electrolyte. Therefore, the material has excellent catalytic performance in the ORR electro-catalysis process, and the half-wave potential of the material can reach 0.9 V.

Description

technical field

[0001] The invention relates to a preparation process of an efficient oxygen reduction reaction (ORR) electrocatalyst, which is characterized in that a MOF precursor is prepared by an anisotropic growth method at room temperature, and then prepared by one-step hydrogen reduction to obtain nano-carbon supported Ni single Atomic electrocatalysts. The method is simple in operation, low in cost, good in repeatability and easy to control. Background technique

[0002] With the development of society, the energy crisis and environmental pollution are becoming more and more serious, therefore, the development of clean energy technology is imminent. As a new generation of green energy technology, fuel cells and metal-air batteries have attracted widespread attention because of their low cost, high capacity, and environmental friendliness. However, limited by the shortcomings of commercial platinum-based catalysts such as poor stability, high cost, and low reserves,...

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