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Preparation method of oxygen reduction catalyst

A catalyst and nano-silicon dioxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low crustal reserves of platinum group metals, poor resistance to methanol poisoning, poor discharge performance, etc., and achieve high oxygen reduction catalytic activity And stability, high yield, good reproducibility

Pending Publication Date: 2021-02-23
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Fuel cells and metal-air batteries are energy devices with high energy density and good discharge performance. The main contradiction limiting the application of these two energy devices comes from the extremely large overpotential caused by the cathode oxygen reduction reaction, resulting in poor discharge performance. severe energy loss
Traditional high-efficiency oxygen reduction catalysts are platinum group metals. Platinum group metals have few reserves in the earth’s crust, are expensive, and have poor resistance to methanol poisoning.

Method used

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  • Preparation method of oxygen reduction catalyst
  • Preparation method of oxygen reduction catalyst
  • Preparation method of oxygen reduction catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0035]The method for preparing a monoatomic copper oxygen reduction catalyst has the following preparation steps:

[0036]Step 1. Dissolve 1000 mg of glucosamine hydrochloride and 170.48 mg of copper chloride dihydrate in 10 ml of water to fully dissolve;

[0037]Step 2: Dissolve 1028.04 mg of nano-silica in it, and stir thoroughly to form a uniform suspension;

[0038]Step 3: Perform low-temperature freeze-drying of the suspension and select minus 5 to minus 10 degrees for freeze drying;

[0039]Step 4. After lyophilization, the product is pyrolyzed in an argon atmosphere at 900 degrees Celsius for 2 hours, and the temperature rises from room temperature to 900 degrees Celsius per minute for heat preservation pyrolysis;

[0040]Step 5. Put the pyrolyzed product in 2 moles per liter of sodium hydroxide aqueous solution at 80 degrees Celsius for 6 hours to remove nano-silica;

[0041]Step 6, washing and drying to obtain a monoatomic copper oxygen reduction catalyst.

Embodiment 2

[0043]The preparation process is basically the same as that of Example 1, and the difference is only: in step 4, the pyrolysis temperature is 800 degrees Celsius.

Embodiment 3

[0045]The preparation process is basically the same as that of Example 1, with the only difference being: in step 4, the pyrolysis temperature is 1000 degrees Celsius.

[0046]The prepared catalyst was characterized as follows. As attachedfigure 1 with2As shown, the monoatomic copper oxygen reduction catalyst sample prepared by the present invention has a cotton-like porous structure,figure 2 The inset is a selected area electron diffraction photograph of this area. It can be seen that the catalyst sample has a nanoporous structure with a pore size of 20±2 nanometers. Selected area electron diffraction is a typical amorphous form without any crystalline diffraction spots, indicating the sample The medium metal is dispersed and there is no bulk metal phase.image 3 The XRD diffraction pattern of the sample was obtained by the Rigaku MiniFlex600 X-ray diffractometer, and the scanning speed was 2° / min. It can be seen from the figure that there is only one carbon diffraction peak in the sam...

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Abstract

The invention discloses a preparation method of an oxygen reduction catalyst. The method comprises the following steps: dissolving a nitrogen-containing organic matter and copper salt in water, dispersing nano silicon dioxide, fully performing stirring to form a uniform suspension, freeze-drying the liquid, carrying out high-temperature pyrolysis on the powder in inert gas, and removing the nano silicon dioxide from the product in hydrofluoric acid or a hot concentrated alkali solution, performing drying to obtain the monatomic copper oxygen reduction catalyst. Compared with the prior art, themonatomic copper oxygen reduction catalyst disclosed by the invention has high oxygen reduction catalytic activity and stability and high zinc-air battery discharge performance; the synthetic methoddisclosed by the invention has the advantages of stable performance of the prepared monatomic copper oxygen reduction catalyst, simple process requirements, short time, good reproducibility, high yield and the like, and can be suitable for large-scale production.

Description

Technical field[0001]The invention relates to the technical field of copper single-atom catalysts, and more specifically, to a preparation method of a copper single-atom oxygen reduction catalyst, its catalytic performance for oxygen reduction in alkaline solutions and its application in zinc-air batteries.Background technique[0002]Traditional fossil fuels cannot be regenerated in a short period of time, and their use brings a series of environmental problems. Solving environmental pollution and finding new energy sources have become problems that need to be solved urgently. Fuel cells and metal-air batteries are energy devices with high energy density and good discharge performance. Among them, the most important contradiction that limits the application of these two energy devices comes from the extreme overpotential caused by the cathode oxygen reduction reaction, resulting in poor discharge performance. The energy loss is serious. The traditional high-efficiency oxygen reduction...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9041Y02E60/50
Inventor 刘海鹏朱胜利崔振铎杨贤金梁砚琴李朝阳吴水林
Owner TIANJIN UNIV
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