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Preparation and application of an electrocatalyst based on a transition metal macrocycle

A technology of macrocyclic compounds and transition metals, applied in the field of electrocatalyst preparation, to achieve the effects of large specific surface area, easy large-scale synthesis, and simple operation

Active Publication Date: 2016-12-28
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metallomacrocycles obtained by molecular self-assembly have not been applied as non-noble metal electrocatalysts

Method used

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  • Preparation and application of an electrocatalyst based on a transition metal macrocycle
  • Preparation and application of an electrocatalyst based on a transition metal macrocycle
  • Preparation and application of an electrocatalyst based on a transition metal macrocycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] At 25°C, mix 3mL of 6M hydrochloric acid aqueous solution with 20mL of 15mM hemin (Hemin) alkaline aqueous solution (0.6M NaOH), stir for 10min, wash with suction and dry. The temperature was programmed to 900°C, heat-treated for 1 h under an argon atmosphere, and cooled to room temperature. Then 0.5M sulfuric acid aqueous solution was refluxed and stirred at 25°C for 30 minutes, filtered with suction, washed with water until neutral, and dried to obtain a powdery non-precious metal electrocatalyst.

[0030] like figure 1 , the structural formula of hemin (Hemin).

[0031] like figure 2 , TEM transmission electron microscopy shows that the product obtained in Example 1 is a cubic structure with a size distribution of 30-450 nm.

[0032] like image 3 , The ORR polarization curve shows that the product obtained in Example 1 has significantly improved oxygen reduction activity compared with unassembled carbohemin.

Embodiment 2

[0034] At 80°C, mix 2mL of 6M hydrochloric acid aqueous solution with 0.5mL of 1mM hemin (Hemin) alkaline aqueous solution (0.6M NaOH), stir for 10min, wash with suction and dry. The temperature was programmed to 900°C, heat-treated for 1 h under an argon atmosphere, and cooled to room temperature. Then 0.5M sulfuric acid aqueous solution was refluxed and stirred at 25°C for 30 minutes, filtered with suction, washed with water until neutral, and dried to obtain a powdery non-precious metal electrocatalyst.

[0035] like Figure 4 , TEM transmission electron microscopy showed that the product obtained in Example 2 was a hemispherical structure with a size distribution of 50-450 nm.

Embodiment 3

[0037] At 70°C, mix 2mL of 0.6M hydrochloric acid aqueous solution with 3mL of 0.25mM hemin (Hemin) alkaline aqueous solution (0.6M NaOH), stir for 10min, filter, wash and dry. The temperature was programmed to 900°C, heat-treated for 1 h under an argon atmosphere, and cooled to room temperature. Then 0.5M sulfuric acid aqueous solution was refluxed and stirred at 70° C. for 30 minutes, filtered with suction, washed with water until neutral, and dried to obtain a powdery non-precious metal electrocatalyst.

[0038] like Figure 5 , TEM transmission electron microscopy shows that the product obtained in Example 3 is a spherical structure with a size distribution of 200-800 nm.

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Abstract

The invention relates to preparation and application of an electrocatalyst based on a transition metal macrocyclic compound. The specific steps include: mixing an acidic aqueous solution with an alkaline aqueous solution of the transition metal macrocyclic compound to make the transition metal macrocyclic compound form a nanostructured material by self-assembly, and carrying out washing, drying, heat treatment, pickling and other steps to obtain the non-noble metal electrocatalyst. The prepared non-noble metal electrocatalyst has a nano-structure with different shapes and uniform size distribution. The non-noble metal electrocatalyst prepared by the invention has oxygen reduction activity, and can be applied in proton exchange membrane fuel cells and metal air cells.

Description

technical field [0001] The invention belongs to the field of fuel cell electrocatalysts, and in particular relates to the preparation and application of an electrocatalyst based on a transition metal macrocyclic compound. Background technique [0002] Fuel cell is a continuous power generation device that converts chemical energy into electrical energy. It has the advantages of fast start-up, high efficiency, and low pollution. It is known as the most promising high-efficiency and clean power generation technology in the 21st century. Electrocatalysts based on noble metals (such as Pt) are one of the core materials for fuel cells. However, their high price, limited resources, and easy poisoning seriously hinder the commercialization of fuel cells. One possible solution is to develop non-precious metal electrocatalysts that can replace platinum to promote the development of fuel cell technology. In the field of non-precious metal electrocatalysts, fruitful work has been carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22H01M4/90
CPCY02E60/50
Inventor 宋玉江谢妍
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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