A kind of preparation method of high-density bimetallic single-atom oxygen reduction catalyst

A single-atom oxygen, bimetallic technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. To achieve the effect of enhanced interaction, excellent electrochemical stability, and enhanced activity

Active Publication Date: 2022-05-27
CHAOWEI POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
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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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  • A kind of preparation method of high-density bimetallic single-atom oxygen reduction catalyst
  • A kind of preparation method of high-density bimetallic single-atom oxygen reduction catalyst
  • A kind of preparation method of high-density bimetallic single-atom oxygen reduction catalyst

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

[0038] Step 1: Configure the precursor solution:

[0039] The soluble zinc salt was dissolved in another soluble metal salt in hydrochloric acid to give a first solution; the o-phenylenediamine (OPD) was dissolved in hydrochloric acid to give a second solution, the first solution and the second solution were mixed and stirred at 0 °C for 1 to 2 h to give a third solution; ammonium persulfate was dissolved in hydrochloric acid to give a fourth solution; slowly dissolved in the fourth solution and stirred at 0 ° C for 2 to 3 h, and then stirred at room temperature for 12 to 24 h to give a precursor solution;

[0040] It should be noted that the present invention first prepares a first solution, and then prepares a second solution, the first solution and the second solution are mixed to obtain a third solution, after preparing the...

Embodiment 1

[0054] The present embodiment provides a high-density bimetallic single-atom oxygen reduction catalyst preparation method, comprising the following steps:

[0055] Step 1: Prepare the precursor solution:

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

[0057] Step 2: Prepare precursor powder:

...

Embodiment 2

[0068] The present embodiment provides a high-density bimetallic single-atom oxygen reduction catalyst preparation method, comprising the following steps:

[0069] Step 1: Prepare the precursor solution:

[0070] 1.487 g zinc nitrate hexahydrate [Zn(NO3) 2 ·6H 2O] Dissolved in 15 ml of 1M HCl, stirred at room temperature for 30min; 1.5 g of o-phenylenediamine (OPD) dissolved in 10 ml of 1M HCl, well stirred to dissolve; the resulting OPD solution was added to the solution of 1, stirred at 0 °C for 2 h; take 3 g of ammonium persulfate (NH 4 S 2 O 8 Dissolve in 10 ml of 1 M HCl, and then obtain the NH 4 S 2 O 8 The solution is added to the solution of 3 and stirred at 0 °C for 2 h. 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 4 h, then cool to room temperature, grind to obtain the precursor powder;

[0073] Step 3: Take 10g ...

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Abstract

The invention relates to a preparation method of a high-density bimetallic single-atom oxygen reduction catalyst, which belongs to the technical field of catalyst preparation and solves the problem that the metal atoms of the existing single-atom catalysts are very easy to agglomerate to form nano-clusters or even nano-particles, resulting in reduced activity and catalyst problems. Technical issues with poor performance. The method comprises the following steps: step 1, preparing precursor solution; step 2, preparing precursor powder; step 3, heating urea in a closed quartz boat at a heating rate of 5-10°C / min under the protection of inert gas to 500~550℃, the calcination time is 4~6h, and g‑C 3 N 4 ; Step 4, the precursor powder and g-C 3 N 4 After mixing and grinding, it is calcined in an inert atmosphere, first at 350-400°C for 1-2 hours; then at 700-1000°C for 1-5 hours to obtain a high-density bimetallic single-atom oxygen reduction catalyst. The high-density bimetallic single-atom oxygen reduction catalyst prepared by the invention is obtained.

Description

Technical field [0001] The present invention relates to the technical field of bimetallic monoatomic oxygen reduction catalyst, in particular to a high-density bimetallic monoatomic oxygen reduction catalyst preparation method. Background [0002] In recent years, clean energy and new 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 excessive use of traditional fossil energy. Among them, due to the slow kinetic process of cathodic oxygen reduction (ORR), the overuse of Pt-based catalysts has led to the overuse of Pt-based catalysts, and the high cost and poor stability of Pt-based catalysts have seriously affected the commercialization process of energy conversion devices such as fuel cells. Therefore, people are committed to the development of low Pt and non-Pt catalysts, including N-C catalysts, non-precious metal oxides or nitrides, transition metal coordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08
CPCB01J27/24B01J35/1004B01J35/0093B01J35/0033B01J37/08B01J37/082
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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