Yolk-eggshell structure nanocage catalyst as well as preparation method and application thereof

Abstract

The invention provides a yolk-eggshell structure nanocage catalyst and a preparation method and application thereof. The catalyst comprises an inner core and a shell layer, the inner core is cuprous oxide, the shell is a compound of cuprous oxide and a transition metal hydroxide, and a cavity is formed between the inner core and the shell layer of the catalyst. The preparation method of the catalyst is simple and efficient, and the catalyst contains no non-noble metal elements, so that the catalyst is relatively low in cost and good in application prospect; the yolk-eggshell structure enablesthe catalyst to have good processability and functionalization characteristics. According to the method, a good microenvironment is provided for reaction, improvement of catalytic efficiency is facilitated, the activity of catalytic oxidation of glucose can reach about 10.0 mA cm <-2>, and the detection sensitivity of glucose reaches about 1300 <mu>A cm <-2> mM <-1>.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to an egg yolk-eggshell structure nanocage catalyst as well as its preparation method and application. Background technique [0002] Glucose, as an important monosaccharide, is not only indispensable for the normal life activities of organisms, but also plays a vital role in fuel cells, biosensing, blood sugar detection, pollutant treatment and chemical products, and the existing The catalytic oxidation effect of the catalyst on glucose is not ideal, so it is necessary to find a new and efficient catalyst. [0003] In recent years, with the rapid development of nanotechnology, nanomaterials with special structures have always been the focus of research. Egg yolk-eggshell structure nanomaterials have attracted great interest from researchers as a new category. The pore can be used as a unique nanoreactor, making full use of the dual functions of the core and the shell. The unique st...

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Problems solved by technology

[0004] At present, the synthesis methods of egg yolk-eggshell nanomaterials mainly include selective etching, Kirkendall effect, electrostatic displacement reaction, etc., but the synthesis path is generally too complicated, the conditions are harsh, and conditions or operations such as high temperature and etching are often required. Therefore, large-scale synthesis has not been possible

CN 103920491A discloses a catalyst with egg yolk-eggshell structure, wherein the shell layer is silicon dioxide with divergent channels, and the inner core is mesoporous carbon spheres loaded with metal nanoparticles. The catalyst is prepared by encapsulation-etching technology, Combining with glucoamylase can be used to produce sorbitol in one-step method of starch hydrolysis-hydrogenation, but the preparation process is relatively complicated, requires more raw materials, takes a long time, and is not conducive to large-scale application; CN 106910907A discloses a core-shell structure Catalyst and its preparation method, the catalyst presents an egg yolk-eggshell structure, composed of a noble metal shell and a transition metal core, but the use of noble metals results in higher catalyst costs, and is mainly used as an electrocatalyst for direct methanol fuel cells, but for Oxidation of glucose had no significant effect

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