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Preparation method of high-density bimetallic monatomic oxygen reduction catalyst

A single atomic oxygen, bimetallic technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Achieve excellent electrochemical stability, enhanced activity, and enhanced interaction effects

Active Publication Date: 2020-08-18
CHAOWEI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above analysis, the embodiment of the present invention aims to provide a method for preparing a high-density bimetallic single-atom oxygen reduction catalyst, which is used to solve the problem that the metal atoms of the existing single-atom catalysts are very easy to agglomerate to form nano-clusters or even nanoparticles, and then It leads to the reduction of activity, and the synthesized catalysts often have low single-atom density, and there are few exposed active sites, so the performance of the catalyst is poor.

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preparation example Construction

[0037] The invention provides a method for preparing a high-density bimetallic single-atom oxygen reduction catalyst, comprising the following steps:

[0038] Step 1. Configure the precursor solution:

[0039]A soluble zinc salt and another soluble metal salt are dissolved in hydrochloric acid to obtain a first solution; o-phenylenediamine (OPD) is dissolved in hydrochloric acid to obtain a second solution, and the first solution and the second solution are mixed and mixed at 0 Stir at ℃ for 1~2h to obtain the third solution; dissolve ammonium persulfate in hydrochloric acid to obtain the fourth solution; slowly dissolve the fourth solution in the third solution and stir at 0℃ for 2~3h, then stir at room temperature 12 to 24 hours to obtain the precursor solution;

[0040] It should be noted that the present invention first prepares the first solution, then prepares the second solution, mixes the first solution and the second solution to obtain the third solution, and slowly ...

Embodiment 1

[0054] A preparation method of a high-density bimetallic single-atom oxygen reduction catalyst provided in this embodiment comprises the following steps:

[0055] Step 1. Prepare precursor solution:

[0056] Get 1.487g zinc nitrate hexahydrate [Zn(NO3) 2 ·6H 2 O] and 0.291g cobalt nitrate hexahydrate [Co(NO3) 2 ·6H 2 O] was dissolved in 15ml 1M HCl, stirred at room temperature for 30min to obtain the first solution. 1.5 g of o-phenylenediamine (OPD) was dissolved in 10 ml of 1M HCl and stirred thoroughly to obtain a second solution. The obtained second solution was added to the first solution, and stirred at 0° C. for 2 h to obtain the third solution. Take 3g ammonium persulfate (NH 4 S 2 o 8 ) was dissolved in 10ml 1M HCl to obtain the fourth solution (NH 4 S 2 o 8 solution), and then add the fourth solution into the third solution, stir at 0° C. for 2 h and then at room temperature for 24 h to obtain a precursor solution.

[0057] Step 2. Prepare precursor powder...

Embodiment 2

[0068] A preparation method of a high-density bimetallic single-atom oxygen reduction catalyst provided in this embodiment comprises the following steps:

[0069] Step 1. Prepare precursor solution:

[0070] 1.487g zinc nitrate hexahydrate [Zn(NO3) 2 ·6H 2 O] Dissolve in 15ml 1M HCl, stir at room temperature for 30min; take 1.5g o-phenylenediamine (OPD) and dissolve in 10ml 1M HCl, fully stir to dissolve; Stir for 2h; get 3g ammonium persulfate (NH 4 S 2 o8 ) was dissolved in 10ml 1M HCl, and the obtained NH 4 S 2 o 8 The solution was added to the solution of 3 and stirred at 0°C for 2h. After stirring at room temperature for 24 h, the precursor solution was obtained.

[0071] Step 2. Prepare precursor powder:

[0072] Transfer the precursor solution to a muffle furnace, heat at 160°C for 4h, then cool to room temperature, and grind to obtain the precursor powder;

[0073] Step 3. Take 10g of urea (Urea) and place it in a quartz boat and cover it, and calcinate to 55...

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Abstract

The invention relates to a preparation method of a high-density bimetallic monatomic oxygen reduction catalyst, belongs to the technical field of catalyst preparation, and solves the technical problems of activity reduction and poor catalyst performance caused by the fact that metal atoms of an existing monatomic catalyst are quite easy to agglomerate to form nano-clusters and even nano-particles.The method comprises the following steps: step 1, preparing a precursor solution; step 2, perparing precursor powder; step 3, heating urea in a closed quartz boat to 500-550 DEG C at a heating rate of 5-10 DEG C / min under the protection of inert gas, and calcining for 4-6 h to prepare g-C3N4; and step 4, mixing and grinding the precursor powder and g-C3N4, calcining in an inert atmosphere, and calcining at the temperature of 350-400 DEG C for 1-2 h; and calcining for 1-5 h again under the condition of 700-1000 DEG C to obtain the high-density bimetallic monatomic oxygen reduction catalyst. The high-density bimetallic monatomic oxygen reduction catalyst is prepared by the method.

Description

technical field [0001] The invention relates to the technical field of bimetallic single-atom oxygen reduction catalysts, in particular to a preparation method of a high-density bimetallic single-atom oxygen reduction catalyst. Background technique [0002] In recent years, clean energy and novel energy conversion devices such as fuel cells and metal-air batteries have attracted widespread attention due to the serious energy and environmental problems caused by the overuse of traditional fossil energy. Among them, due to the slow kinetic process of cathode oxygen reduction (ORR), the excessive use of Pt-based catalysts, and the high cost and poor stability of Pt-based catalysts have seriously affected the commercialization of energy conversion devices such as fuel cells. Therefore, people are committed to developing low-Pt and non-Pt catalysts, including N-C catalysts, non-noble metal oxides or nitrides, transition metal-coordinated macrocyclic compounds, and M-N-C catalysts...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/08
CPCB01J27/24B01J37/08B01J37/082B01J35/399B01J35/33B01J35/61
Inventor 陈聪赵宏滨阙奕鹏刘孝伟叶代新方建慧张久俊
Owner CHAOWEI POWER CO LTD
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