A kind of multi-doped carbon material and its preparation method and application

Abstract

The invention discloses a multi-doped carbon material and its preparation method and application. The multi-doped carbon material disclosed in the present invention is a carbon material doped with a transition metal and a heteroatom, wherein the transition metal is dispersed in the heteroatom-doped carbon material in the form of a single atom; the multi-doped carbon material of the present invention It is prepared by mixing and ball milling carbon materials, transition metal compounds and heteroatom-containing compounds; the invention also discloses the application of multi-doped carbon materials in preparing batteries or supercapacitors. The transition metals in the multi-doped carbon material provided by the invention are dispersed at the atomic level, exhibit excellent catalytic activity and stability in oxygen reduction reaction, and solve the problems of low catalytic activity and poor stability of the existing multi-doped carbon material. The ball milling method provided by the invention can prepare atomically dispersed multi-doped carbon materials in large quantities, which solves the problems of complex preparation process, high-temperature calcination and cumbersome post-treatment in the prior art, and the obtained product has a large size range and irregular shape. .

Description

technical field [0001] The invention relates to the technical field of catalysts. More specifically, it relates to a multi-doped carbon material and its preparation method and application. Background technique [0002] Rational design and synthesis of high-performance electrode materials are crucial in energy conversion and storage technologies. Oxygen reduction reaction (ORR), as an important half-reaction in energy conversion systems, has received extensive attention. However, the slow kinetics, large overpotential and stability issues of ORR limit its further development. The noble metal platinum and platinum-based materials are the most commonly used electrocatalysts in ORR due to their excellent catalytic activity, however, their high cost and effective resources greatly limit their commercial applications. In addition, platinum catalysts also have disadvantages such as poor stability and poor resistance to methanol cross-effect in actual fuel cell operation. Previo...

AI Technical Summary

Problems solved by technology

However, the synthesis of M-N-C catalysts usually involves complex processes: firstly, it needs to mix various reaction precursors (such as transition metal salts, N-containing precursors, carbon sources, etc.), and then undergo high-temperature calcination and tedious post-treatment; on the other hand, High-temperature pyrolysis strategies often lead to mixed products (e.g., metals, metal oxides, or metal carbides) with large size ranges, irregular morphologies, and / or different compositions, posing difficulties for further research and understanding of the relationship between catalyst structure and performance.

Images