Preparation method and electrocatalytic application of carbon aerogel single metal atom catalyst

Abstract

The invention discloses a preparation method and electrocatalytic application of a carbon aerogel monometal atom catalyst. According to the aerogel, chitosan hybrid hydrogel is used as a precursor, inthe hybrid hydrogel, silicon dioxide nanoparticles are used as a pore-forming agent, a complex of ferrous iron and phenanthroline is used as an iron source and a nitrogen source, and carbon aerogel uniformly loaded with iron single atoms is obtained through freeze-drying, calcining and pickling; and the carbon aerogel has relatively high conductivity, rich pore structures and active single metalsites, excellent oxygen reduction (ORR) and oxygen generation (OER) electrocatalytic activity is shown under an alkaline condition is shown, and due to the fact that the overpotential difference between ORR and OER is small and the performance of an assembled zinc-air battery is superior to that of a commercial Pt / C and RuO2 electrocatalyst, the catalyst prepared through adoption of the method hasthe potential application value in the energy storage and conversion technology.

Description

technical field [0001] The invention relates to the technical field of energy storage and conversion, in particular to a preparation method and electrocatalytic application of a carbon airgel single metal atom catalyst. Background technique [0002] Global climate change and environmental pollution have stimulated the development of sustainable clean energy storage and conversion technologies, among which metal-air batteries have attracted much attention due to their high energy density and environmental friendliness. The overall efficiency of the charge-discharge process of metal-air batteries is mainly determined by two reactions, the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Although platinum group metal materials, like Pt / C, RuO 2 and Ir / C have excellent ORR or OER catalytic activity, but these materials are scarce and expensive, which seriously hinders their large-scale application. In addition, none of these noble metal materials can si...

AI Technical Summary

Problems solved by technology

Although platinum group metal materials, like Pt / C, RuO 2 and Ir / C have excellent ORR or OER catalytic activity, but these materials are scarce and expensive, which seriously hinders their large-scale application.

In addition, none of these noble metal materials can simultaneously exhibit excellent ORR and OER catalytic performance.

Therefore, the development of low-cost and high-activity oxygen bifunctional catalysts is of great significance for basic and technical research, and there are also great challenges

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