A kind of VIII single-atom dispersed catalyst and preparation method thereof

Abstract

The present invention is a VIII group single-atom dispersed catalyst and its preparation method. The catalyst forms a metal-organic framework by coordinating the VIII group atom and the Zn atom with the ligand organic ligand, and then heats the VIII group atom at a high temperature under an inert gas. The organic ligands coordinate to form a carbon support doped with non-metallic heteroatoms, and the Group VIII atoms interact with the non-metallic heteroatoms and exist in the form of single atoms wrapped in the carbon layer. The invention uses the metal-organic framework as the precursor, and the required catalyst can be prepared only through high-temperature pyrolysis, and the preparation method is simple and feasible, and is a general method for synthesizing single atoms. The VIII group single-atom dispersed catalyst provided by the invention has good thermal stability and good catalytic activity in fuel cell cathode oxygen reduction catalysis.

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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