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Molybdenum monatomic catalyst and preparation method and application thereof

A catalyst and atomic technology, applied in the field of molybdenum single-atom catalysts and its preparation, can solve the problems of lack of chemical bond connection, expensive equipment, complicated steps, etc., and achieve the effect of promoting electrocatalytic oxygen reduction reaction, convenient operation, and huge surface area

Inactive Publication Date: 2019-12-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high surface energy of metal single atoms, it is very easy to agglomerate, so there are still great challenges in the preparation of single-atom catalysts.
The traditional method of preparing single-atom catalysts is the atomic layer deposition method, but this preparation method has expensive equipment, complicated steps, and the lack of chemical bonds between the single atoms and the support prepared by this method, so the stability is also poor

Method used

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  • Molybdenum monatomic catalyst and preparation method and application thereof
  • Molybdenum monatomic catalyst and preparation method and application thereof
  • Molybdenum monatomic catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0047] The invention provides a method for preparing a molybdenum single-atom catalyst, comprising the following steps:

[0048] a) Molybdenum-containing polyacid-based metal-organic frameworks were pyrolyzed in nitrogen and / or rare gas atmospheres, and then etched with hydrochloric acid solution to obtain carbon-supported MoO 3 ;

[0049] b) Etching the carbon-supported MoO with ammonia water 3 MoO in 3 , followed by heating and reacting in an ammonia atmosphere to obtain a molybdenum single-atom catalyst;

[0050] The molybdenum single-atom catalyst includes a porous carbon skeleton and molybdenum single atoms anchored on the porous carbon skeleton through carbon and nitrogen atoms.

[0051] In the preparation method provided by the present invention, a molybdenum-containing polyacid-based metal-organic framework (NENU-5 for short) is firstly provided. The present invention does not specifically limit the source of the NENU-5, which can be prepared according to methods we...

Embodiment 1

[0066] (1) Preparation of molybdenum single-atom catalyst:

[0067] 1) 140 mg of trimesic acid was dissolved in methanol to form solution A, 200 mg of copper acetate, 300 mg of phosphomolybdic acid and 74 mg of glutamic acid were dissolved in deionized water to form solution B, and B solution was dissolved under stirring conditions Pour into solution A, continue to stir for 12 hours, and centrifuge to dry to obtain the NENU-5 precursor.

[0068] 2) Put the NENU-5 precursor in a tube furnace, 2 In the atmosphere, the temperature was raised to 450 °C and kept for 4 hours. After fully cooling to room temperature, it was etched with 3 mol / L hydrochloric acid solution for 10 hours, centrifuged, washed, and dried to obtain MoO 3 / C.

[0069] 3) The above-mentioned MoO is mixed with ammonia water (concentration 25~28wt%) solution 3 / C nanoparticles are etched for 6h, and the chemical equation of the reaction is: 7MoO 3 +6NH 3 ·H 2 O→(NH 4 ) 6 Mo 7 o 24 +3H 2 O, then centri...

Embodiment 2

[0079] Zinc-air fuel cell performance test

[0080] First, use the rotating disk electrode (RDE) to evaluate the electrocatalytic oxygen reduction performance of the molybdenum single-atom catalyst prepared in Example 1. The electrolyte is an oxygen-saturated 0.1M KOH aqueous solution. Specific electrode, glassy carbon rotating disk electrode as working electrode, in which the loading capacity of catalyst is 0.204mg cm -2 . Under the rotation speed of 1600rpm, the line-scan voltammetry curve test was carried out at a scan rate of 10mV / s, and the limiting current density and half-wave potential were obtained. Experimental test results such as Image 6 as shown, Image 6 It is a performance comparison chart of the oxygen reduction reaction between the molybdenum single-atom catalyst provided in Example 2 of the present invention and the commercial 20wt% Pt / C catalyst. pass Image 6 It can be seen that both the limiting current density and the half-wave potential of the moly...

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Abstract

The invention belongs to the field of fuel cells, and particularly relates to a molybdenum monatomic catalyst and a preparation method and application thereof. The molybdenum monatomic catalyst provided by the invention comprises a porous carbon skeleton and single molybdenum atoms anchored to the porous carbon skeleton by carbon and nitrogen atoms. The molybdenum monatomic catalyst provided by the invention has good catalytic performance and stability. The preparation method provided by the invention comprises the following steps: (a) pyrolyzing a molybdenum-containing polyacid-based metal organic framework in a nitrogen and / or rare gas atmosphere, and performing etching with a hydrochloric acid solution to obtain carbon-loaded MoO3; and (b) etching MoO3 in the carbon-loaded MoO3 by usingammonia water, and then, performing heating reaction in an ammonia atmosphere to obtain a molybdenum monatomic catalyst, wherein the molybdenum monatomic catalyst comprises a porous carbon skeleton and single molybdenum atoms anchored to the porous carbon skeleton by carbon and nitrogen atoms. The preparation method provided by the invention is convenient to operate, simple and feasible, and doesnot need expensive instruments.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a molybdenum single-atom catalyst and its preparation method and application. Background technique [0002] Zinc-air fuel cell is a power generation device that directly converts chemical energy into electrical energy through electrochemical reactions. It has the advantages of high energy density, low price, green environmental protection, safety and portability, and is considered by experts to be the future of electric vehicles, unmanned vehicles, etc. Machines and portable electronics such as hearing aids are ideal power supplies. Zinc-air fuel cell has been authorized by the U.S. Department of Energy and the Chinese Ministry of Science and Technology to establish the "U.S.-China Energy and Environmental Technology Exchange Center" as a key project of Sino-U.S. cooperation. The zinc-air fuel cell uses zinc as the negative electrode and air as the positive electrode. The chemical equa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06
CPCH01M4/9041H01M4/9083H01M12/06
Inventor 陈乾旺王长来童慧刚
Owner UNIV OF SCI & TECH OF CHINA