Catalyst for VIII group single atomic dispersion and preparation method thereof

Abstract

The invention relates to a catalyst for VIII group single atomic dispersion and a preparation method thereof. The catalyst is a nonmetal heteroatom doped carbon carrier formed by carrying out coordination on VIII group atoms and Zn atoms as well as organic ligands to form a metal organic framework, then carrying out high temperature pyrolysis reaction in presence of inert gas and carrying out coordination with organic ligands, wherein the VIII groups atoms interact with the nonmetal heteroatoms, are coated in a carbon layer and exist in a single atom form. According to the invention, the metalorganic framework is taken as a precursor, the required catalyst can be prepared by adopting a high temperature pyrolysis method only, and the preparation method is simple and practicable and is a universal method for synthesizing single atoms. The provided catalyst for the VIII group single atomic dispersion has good thermal stability and shows good catalytic activity in catalysis of oxygen reduction of a cathode of a fuel cell.

Description

technical field [0001] The invention belongs to the field of fuel cell technology inventions, and in particular relates to a VIII single-atom dispersed catalyst and a preparation method thereof. Background technique [0002] With the development of human society, issues such as global energy consumption and climate change have aroused widespread concern, so it is imminent to find alternative clean energy. Currently, the new energy sources being developed include solar energy, wind energy, fuel cells, etc. Among them, the fuel cell is a device that directly converts chemical energy into electrical energy through the electrode reaction of hydrogen and oxygen to generate water, without generating waste gas, due to its high energy conversion efficiency (up to 60%-80%) and environmental friendliness. It has attracted people's attention and is considered to be the preferred clean energy power generation technology in the 21st century. However, the cathode oxygen reduction kineti...

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Problems solved by technology

[0003] Platinum carbon, as the most widely used fuel cell catalyst, is not only expensive but also has poor catalyst stability. So far, the solution is to use platinum alloy or non-platinum catalysts instead of platinum carbon catalysts to reduce costs and improve stability. Now for non-platinum The most researched catalysts are new carbon-based nanomaterials

Many non-noble metal carbon materials such as carbon doped with nitrogen, sulfur, phosphorus, etc. have been studied for oxygen reduction catalysts in fuel cells, but carbon-based single-atom non-noble metal nanomaterials are used for cathode oxygen reduction in alkaline and acidic fuel cells. Catalyst has not been reported yet

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