Non-noble metal catalyst for oxygen reduction, and preparation and application of catalyst

Abstract

Disclosed is a non-noble metal catalyst for oxygen reduction. The catalyst comprises a flake-like graphene carrier; a nitrogen-doped carbon skeleton arranged between neighbor flake layers of the flake-like graphene carrier; the graphene flake layers are separated by the nitrogen-doped carbon skeleton; and nanometer particles are adhered to the flake layers of graphene. The nanometer particles are one or more than two of carbon-coated non-noble metal particles, carbon-coated non-noble metal carbide particles, and carbon-coated non-noble metal nitride particles. A preparation method of the non-noble metal catalyst for oxygen reduction comprises: adding graphite oxide and non-noble metal precursor salt into water; performing mixing and standing; adding nitrogen-containing micro-molecules, a Nafion solution, and an oxidizing agent; performing uniform mixing; allowing the obtained solution to be evaporated; performing freeze-drying; and performing temperature programming thermal treatment and other after-treatment to obtain the non-noble metal catalyst for oxygen reduction. The catalyst has advantages of high oxygen reduction activity, good mass transfer performance, and low price.

Description

technical field

[0001] The invention relates to a non-noble metal oxygen reduction catalyst, in particular to a non-noble metal oxygen reduction catalyst which can be used in proton exchange membrane fuel cells, alkaline anion exchange membrane fuel cells and metal-air batteries.

[0002] The present invention also relates to the preparation method of the above-mentioned non-noble metal oxygen reduction catalyst. technical background

[0003] Oxygen reduction reaction is the cathode reaction of proton exchange membrane fuel cells, alkaline anion exchange membrane fuel cells and metal-air batteries. The activation energy of the electrode process is high, and a large overpotential is required to make the reaction go smoothly. Therefore, electrochemical catalytic materials for reducing the activation energy of oxygen reduction reaction have become a hot spot in the research of oxygen reduction reaction. At present, the most common catalytic material for oxygen reduction is pla...

Examples

Embodiment 1

[0034] Example 1: 50 mg of graphite oxide was dispersed in 100 mL of water, ultrasonicated for 4 hours to obtain a uniform graphite oxide solution, 26.8 mg of hexahydrate and ferric chloride were added, ultrasonicated for 1 hour, left standing for 24 hours, and 277.5 mg of 5% Solution and 0.25mL aniline, stirred at 5°C for 1h, added 0.6257g ammonium persulfate, stirred at 5°C for 36h, evaporated the solvent at 90°C to make the solid content to 5%, freeze-dried for 48h, and obtained airgel. Put the airgel in a quartz boat, raise the temperature to 900°C at 5°C / min under the protection of nitrogen, keep it warm for 1h, cool naturally, then treat it in 0.5mol / L sulfuric acid solution at 80°C for 6h, wash and dry, and then Put it in a quartz boat for the first time and raise the temperature to 900°C at 5°C / min under the protection of nitrogen, keep it warm for 3h, and cool naturally to obtain a non-precious metal oxygen reduction catalyst.

[0035] Weigh the catalyst 5mg of the g...

Embodiment 2

[0036] Embodiment 2: added 5% The amount of the solution is 1.11g, and all the other conditions are the same as in Example 1.

Embodiment 3

[0037] Embodiment 3: added 5% The amount of the solution is 3.33g, and all the other conditions are the same as in Example 1.

technical field

[0001] The invention relates to a non-noble metal oxygen reduction catalyst, in particular to a non-noble metal oxygen reduction catalyst which can be used in proton exchange membrane fuel cells, alkaline anion exchange membrane fuel cells and metal-air batteries.

[0002] The present invention also relates to the preparation method of the above-mentioned non-noble metal oxygen reduction catalyst. technical background

[0003] Oxygen reduction reaction is the cathode reaction of proton exchange membrane fuel cells, alkaline anion exchange membrane fuel cells and metal-air batteries. The activation energy of the electrode process is high, and a large overpotential is required to make the reaction go smoothly. Therefore, electrochemical catalytic materials for reducing the activation energy of oxygen reduction reaction have become a hot spot in the research of oxygen reduction reaction. At present, the most common catalytic material for oxygen reduction is pla...

Examples

Embodiment 1

[0034] Example 1: 50 mg of graphite oxide was dispersed in 100 mL of water, ultrasonicated for 4 hours to obtain a uniform graphite oxide solution, 26.8 mg of hexahydrate and ferric chloride were added, ultrasonicated for 1 hour, left standing for 24 hours, and 277.5 mg of 5% Solution and 0.25mL aniline, stirred at 5°C for 1h, added 0.6257g ammonium persulfate, stirred at 5°C for 36h, evaporated the solvent at 90°C to make the solid content to 5%, freeze-dried for 48h, and obtained airgel. Put the airgel in a quartz boat, raise the temperature to 900°C at 5°C / min under the protection of nitrogen, keep it warm for 1h, cool naturally, then treat it in 0.5mol / L sulfuric acid solution at 80°C for 6h, wash and dry, and then Put it in a quartz boat for the first time and raise the temperature to 900°C at 5°C / min under the protection of nitrogen, keep it warm for 3h, and cool naturally to obtain a non-precious metal oxygen reduction catalyst.

[0035] Weigh the catalyst 5mg of the g...

Embodiment 2

[0036] Embodiment 2: added 5% The amount of the solution is 1.11g, and all the other conditions are the same as in Example 1.

Embodiment 3

[0037] Embodiment 3: added 5% The amount of the solution is 3.33g, and all the other conditions are the same as in Example 1.

Images