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High-nitrogen-content non-noble metal monatomic catalyst as well as preparation method and application thereof

A non-precious metal, high nitrogen content technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation of precursor raw materials, complex treatment of pore-forming agents, and harmful pollution. Achieve the effect of improving catalyst activity, low price and easy availability

Pending Publication Date: 2022-07-08
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the disadvantages of complex preparation of precursor raw materials, high cost, complex pore-forming agent treatment, and harmful pollution in the prior art, the present invention provides a non-noble metal single-atom catalyst with high nitrogen content and its preparation method and application.

Method used

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  • High-nitrogen-content non-noble metal monatomic catalyst as well as preparation method and application thereof
  • High-nitrogen-content non-noble metal monatomic catalyst as well as preparation method and application thereof
  • High-nitrogen-content non-noble metal monatomic catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 0.25g of cobalt chloride hexahydrate, 2g of urea and 0.5g of glucose into deionized water, stir to dissolve evenly, then add excess sodium chloride, stir evenly, and then carry out oil bath reflux reaction at 150 ° C for 5 hours; After room temperature, the oil bath product was subjected to freeze-drying treatment; after freeze-drying, the product was subjected to gradient pyrolysis treatment in a tube furnace with argon atmosphere. The product was first heated at 5°C min -1 The heating rate was raised from room temperature to 500 °C, held for 1 h; then at 2 °C min -1 The heating rate was increased to 800 °C, and the temperature was kept for 1 h; the primary pyrolysis product was washed with deionization, filtered three times, and then dried to remove the sodium chloride salt template; in an oil bath environment of 80 °C, 0.5M dilute The metal nanoparticles were washed away with sulfuric acid, filtered, washed to neutrality, and dried; finally, a secondary pyrolysi...

Embodiment 2

[0050] The specific steps are the same as in Example 1, the difference is that the conditions of preliminary pyrolysis are reduced to 2°C·min -1 The temperature increase rate was increased to 500°C.

Embodiment 3

[0052] The specific steps are the same as in Example 1, the difference is that the conditions of the preliminary pyrolysis are increased to 10°C·min -1 The temperature increase rate was increased to 500°C.

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Abstract

The invention relates to the field of catalyst preparation, and discloses a high-nitrogen-content non-noble metal monatomic catalyst and a preparation method and application thereof.The preparation method includes the following preparation steps that a nitrogen source, a carbon source, non-noble metal salt and a salt template are added into deionized water according to a certain proportion to be evenly mixed; then sequentially carrying out oil bath and freeze drying treatment to prepare precursor powder; carrying out gradient pyrolysis on the precursor powder under the protection of inert atmosphere, and then carrying out acid pickling on the obtained product to remove metal elementary substance particles so as to obtain black powder; and finally, carrying out secondary pyrolysis on the black powder in an inert atmosphere to prepare the high-nitrogen-content non-noble metal monatomic catalyst which is applied to an electro-catalytic oxygen reduction reaction, a fuel cell and a metal-air battery. The preparation scheme is simple and green, the prepared product has a hierarchical porous structure, monatomic metal active sites are uniformly dispersed, and the catalytic activity is improved.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a non-precious metal single-atom catalyst with high nitrogen content and a preparation method and application thereof. Background technique [0002] The increasing problems of environmental pollution and energy shortage have stimulated the vigorous development of sustainable energy conversion and storage technologies, such as fuel cells and metal-air batteries. However, the slow kinetics of the cathodic oxygen reduction reaction seriously affects the overall energy conversion efficiency of this type of device. Although platinum group noble metals have excellent oxygen reduction reaction activity, these materials have disadvantages such as high price, scarce reserves and poor stability, which hinder their industrial production and application. In recent studies, it was found that transition metal composite carbon-doped materials not only exhibit good electrocatalytic oxygen re...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/08B01J37/32H01M4/90
CPCB01J27/24B01J37/082B01J37/32H01M4/9041H01M4/9083B01J35/33B01J35/617B01J35/60Y02E60/50
Inventor 孙骏婷金佳翔郭俊杰王静
Owner HANGZHOU DIANZI UNIV