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Oxygen reduction catalyst as well as preparation method and application thereof

A catalyst and outer layer technology, which is applied in the field of preparation of non-platinum catalysts and non-platinum oxygen reduction catalysts, can solve problems such as the activity and stability of iron-based non-platinum catalysts, and achieve the effect of improving stability and catalyst activity

Active Publication Date: 2017-06-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a new catalyst for the problems of activity and stability of existing iron-based non-platinum catalysts

Method used

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  • Oxygen reduction catalyst as well as preparation method and application thereof
  • Oxygen reduction catalyst as well as preparation method and application thereof
  • Oxygen reduction catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of non-platinum oxygen reduction catalyst, comprising the following steps,

[0026] (a) Add melamine, glucose and ferric chloride with a molar ratio of 20:1:0.01 into deionized water at 95°C, stir until completely dissolved to obtain a mixed solution; stir until evenly mixed, and then dry the solid powder by rotary evaporation;

[0027] (b) In a tube furnace, under the protection of nitrogen, raise the temperature to 600°C at 5°C / min, hold for 2 hours, then raise the temperature to 900°C at 5°C / min, hold for 2 hours, take out the carbon package after cooling Nanomaterials with metallic structures.

[0028] (c) Take 200 mg of the sample obtained in step 2, add 10 mL of phosphoric acid / sulfuric acid (V / V=3:7) mixed acid solution, stir in ice bath for 2 hours, add 100 mg of potassium permanganate, and then After stirring for 1 hour at bath temperature, wash, filter, and dry;

[0029] (d) Raise the temperature of the sample obtained in step c to 900°C...

Embodiment 2

[0034] A preparation method of non-platinum oxygen reduction catalyst, comprising the following steps,

[0035] (a) Add melamine, glucose and cobalt acetate in a molar ratio of 10:1:0.02 to deionized water at 95°C, stir until completely dissolved to obtain a mixed solution; stir until evenly mixed, and then dry the solid powder by rotary evaporation;

[0036] (b) In a tube furnace, under the protection of nitrogen, raise the temperature to 600°C at 5°C / min, keep it for 2 hours, then raise the temperature to 900°C at 5°C / min, keep it for 2 hours, take out the carbon package after cooling Nanomaterials with metallic structures.

[0037] (c) Take 200 mg of the sample obtained in step 2, add 10 mL of phosphoric acid / sulfuric acid (V / V=3:7) mixed acid solution, stir at ice bath temperature for 2 hours, add 100 mg of potassium permanganate, and then After stirring for 1 hour at ice bath temperature, wash, filter, and dry;

[0038] (d) Raise the temperature of the sample obtained i...

Embodiment 3

[0040] A preparation method of non-platinum oxygen reduction catalyst, comprising the following steps,

[0041] (a) Add melamine, glucose and nickel acetate in a molar ratio of 10:1:0.02 to deionized water at 95°C, stir until completely dissolved to obtain a mixed solution; stir until evenly mixed, and then dry the solid powder by rotary evaporation;

[0042] (b) In a tube furnace, under the protection of nitrogen, raise the temperature to 600°C at 5°C / min, keep it for 2 hours, then raise the temperature to 900°C at 5°C / min, keep it for 2 hours, take out the carbon package after cooling Nanomaterials with metallic structures.

[0043] (c) Take 200 mg of the sample obtained in step 2, add 10 mL of phosphoric acid / sulfuric acid (V / V=3:7) mixed acid solution, stir at ice bath temperature for 2 hours, add 100 mg of potassium permanganate, and then After stirring for 1 hour at ice bath temperature, wash, filter, and dry;

[0044] (d) Raise the temperature of the sample obtained i...

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Abstract

The invention discloses a non-platinum oxygen reduction catalyst and a preparation method thereof. The non-platinum oxygen reduction catalyst is characterized by comprising a three-layer core-shell structure, wherein a core is Fe, Co, Ni metal nanoparticles or alloy of the metal nanoparticles, an intermediate layer is a carbon coating layer, and an outer layer is a peeled graphene nanosheet layer; the size of the metal core of the non-platinum catalyst is 1-50 nanometers; the middle carbon coating layer is of a nanotube structure, and the size of a nanotube is 2-100 nanometers; and the outer layer, namely the peeled graphene nanosheet layer, is bonded with a middle graphite coating layer through covalent bonds, the surface of the peeled graphene nanosheet layer is doped with doping elements such as N and O, and the concentration of the doping elements is 0.5%-20%. The catalyst synthesized by virtue of the preparation method has excellent oxygen reduction catalytic performance and stability.

Description

technical field [0001] The invention belongs to the field of electrocatalysis of nanometer materials, and mainly relates to a non-platinum catalyst; the invention also relates to a preparation method of the non-platinum oxygen reduction catalyst. [0002] technical background [0003] In recent years, low-temperature proton exchange membrane fuel cell technology has developed rapidly. However, limited by the high cost of batteries, its commercialization process is slow. Expensive platinum catalyst is the main factor restricting the cost reduction of fuel cells. The development of low-platinum and non-platinum catalysts has become an important topic in the development of fuel cells. [0004] Recently, iron-based oxygen reduction catalysts have received much attention. Extensive studies have shown that nitrogen-stabilized monatomic iron formed in iron-based catalysts serves as the active center. However, this catalyst is not stable in catalytic oxygen reduction process, esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/9041H01M4/9083Y02E60/50
Inventor 孙公权金具涛姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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