Preparation of carbon material covalent loading bionic multi-core copper-oxygen reduction electrocatalyst

Abstract

The invention provides a method for preparing a bionic electrocatalyst by modifying covalent bonds to the surface of a carbon-based material through a multi-core copper catalytic active center of simulated laccase. The complex system prepared by the technology refers to a high-efficiency simulated laccase multi-core copper catalytic active center and can be used for catalyzing an oxygen molecule reduction reaction, and the catalyst serves as an oxygen molecule reduction electrocatalyst and is high in catalytic activity and high in stability. Under alkaline conditions, the stability of the prepared catalyst far exceeds that of a Pt / C catalyst, and the methanol crossover resistance is excellent. The research proves that a multi-core copper complex is modified onto the carbon-based material by utilizing the covalent bonds, the method is expected to become an effective method for preparing a high-efficiency base metal oxygen reduction electrocatalyst, and the electrocatalyst has huge potential application prospects and commercial values in the field of alkaline fuel cell electric automobiles and the like.

Description

technical field [0001] The invention relates to the field of non-precious metal catalysts for fuel cells. Specifically, the invention describes a preparation method of a multi-nuclear copper biomimetic electrocatalyst that simulates laccase multi-nuclear copper catalytic active centers and covalently supports the surface of carbon-based materials. Background technique [0002] A fuel cell is a high-efficiency continuous power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy by electrochemical reaction without combustion. It is a renewable and environmentally friendly new energy source that can be used to replace coal, Traditional energy sources such as oil and natural gas. Therefore, when the fuel cell is in use, it is neither like a primary battery that consumes active materials and must be discarded, nor does it need to be regularly charged like a secondary battery. Theoretically speaking, as long as fuel is continuou...

AI Technical Summary

Problems solved by technology

However, since the preparation of non-noble metal ORR catalysts mostly adopts a trial-and-error method, the preparation process often requires high-temperature treatment. This heat treatment process causes the cracking of the molecular structure of the precursor, making it impossible for researchers to adjust the reaction of the catalyst by changing the catalyst structure. active

In addition, most of the currently reported copper-containing ORR electrocatalysts have relatively low catalytic activity and poor stability in alkaline environments, and are still far from the goal of commercial application.

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