Zinc-doped graphene catalyst as well as preparation method and application thereof

Abstract

The invention provides a zinc-doped graphene catalyst, a preparation method thereof and an application of the zinc-doped graphene catalyst in electrochemical nitrogen reduction reaction, and the preparation method comprises the following steps: step 1, adding urea, a zinc source and citric acid into water, stirring for mixing, and drying to obtain a precursor; 2, subjecting the precursor to high-temperature carbonization in an inert atmosphere, dividing high-temperature carbonization into two processes, wherein the carbonization temperature in the first process is 500-600 DEG C, and the carbonization temperature in the second process is 900-1100 DEG C; the preparation method is simple, metal can be loaded on the graphene-like material in the form of single atoms or small clusters, and meanwhile, the prepared catalyst has the performance of efficiently catalyzing nitrogen reduction and good stability.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and specifically relates to a zinc-doped graphene-like catalyst and a preparation method and application thereof. Background technique [0002] There are many types of catalysts for electrochemical synthesis of ammonia, including noble metal electrocatalysts, non-noble metal electrocatalysts and their compounds, conductive polymers, and single-atom electrocatalysts. Carbon-based catalytic materials have attracted extensive attention due to their advantages such as high surface area, good electrical conductivity, tunable porosity, and abundant defect sites. The incorporation of single-atom metals or clusters into the carbon material framework can not only improve the atomic utilization of metal catalysts, but also break the electrical neutrality of carbon, increase the charge and spin density, and convert inert carbon into active electrocatalysts. [0003] Graphene-like materials have an ultra-thi...

AI Technical Summary

Problems solved by technology

[0004] Metal is a good conductive material and catalytically active material, but its surface area is low, resulting in low atom utilization, while single-atom metals have atomic size, good conductivity and independent positions, high atom utilization, and have Unsaturated coordination and unique electronic structure, an emerging research frontier in catalysis

However, the high surface energy of single atoms can easily lead to agglomeration and damage to the catalytic sites.

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