Oxygen reduction catalyst, and preparation method and application thereof

A technology of catalyst and oxygen element, applied in the field of electrochemical catalysis, can solve the problems of small Pt precious metal reserves, lack of resources, poor tolerance, etc., and achieve the effects of excellent oxygen reduction activity, good conductivity, and simple preparation method

Inactive Publication Date: 2019-04-02
KELAS ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most commonly used catalyst for catalytic oxygen reduction is Pt / C catalyst, but due to the small reserves of Pt noble metal, the resource is very scarce, the price is very expensive, and this catalyst has poor tolerance to CO and methanol, so the research and development of efficient and stable Non-noble metal-based catalysts and even non-metal-based oxygen reduction catalysts have become research hotspots

Method used

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  • Oxygen reduction catalyst, and preparation method and application thereof
  • Oxygen reduction catalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0019] The preparation method of oxygen reduction catalyst is as follows:

[0020] 2g graphene oxide is immersed in the nitric acid solution that contains L-cystine in 200mL (in the nitric acid solution that contains L-cystine, the concentration of L-cystine is 0.05mol / L, and the concentration of nitric acid is 0.1mol / L), standing and impregnating for 30min, filtering and separating graphene oxide, vacuum drying at 40°C for 12h, then calcining at 900°C for 2h under nitrogen atmosphere, and finally grinding the obtained powder through a high-speed ball mill at 2000rpm for 30min to obtain an oxygen reduction catalyst .

[0021] The oxygen reduction catalyst obtained in this embodiment is analyzed by XRD to obtain figure 1 ,Depend on figure 1 It can be seen that the main body of the material is a graphitized carbon material. The oxygen reduction catalyst obtained in this embodiment is subjected to linear voltammetry scanning, and the obtained figure 2 ,Depend on figure 2 I...

Embodiment 2

[0023] The preparation method of oxygen reduction catalyst is as follows:

[0024] Submerge 2g of carbon nanotubes in 200mL of nitric acid solution containing cysteine ​​and boric acid (in this nitric acid solution containing cysteine ​​and boric acid, the concentration of cysteine ​​is 0.05mol / L, and the concentration of nitric acid is 0.1 mol / L), after standing and impregnating for 30 minutes, the carbon nanotubes were separated by filtration, vacuum dried at 40°C for 12 hours, then calcined at 850°C for 2 hours under a nitrogen atmosphere, and finally the obtained powder was ground by a high-speed ball mill at 2500rpm for 10 minutes to obtain oxygen reduction catalyst.

Embodiment 3

[0026] The preparation method of oxygen reduction catalyst is as follows:

[0027] Submerge 2g of carbon nanofibers in 200mL of a mixed aqueous solution of boric acid and phosphoric acid (in the mixed aqueous solution of boric acid and phosphoric acid, the concentration of boric acid is 0.1mol / L, and the concentration of phosphoric acid is 0.1mol / L), and after standing for 30min, filter and separate the carbon nanofibers. The nanofibers were vacuum-dried at 40°C for 12h, then calcined at 800°C for 2h under a nitrogen atmosphere, and finally the obtained powder was ground by a high-speed ball mill at 500rpm for 60min to obtain an oxygen reduction catalyst.

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Abstract

The invention discloses an oxygen reduction catalyst. The oxygen reduction catalyst comprises a carbon material and two or more doping elements doped in the carbon material, wherein the doping elements are non-metallic elements excluding carbon and oxygen elements in the group IIIA and the group VA to the group VIIA. The invention further discloses a preparation method and an application of the above oxygen reduction catalyst. The oxygen reduction catalyst disclosed by the invention has a large specific surface area, good electrical conductivity, high stability, excellent oxygen reduction activity and simple preparation method, and thus is suitable for commercial application.

Description

technical field [0001] The invention relates to the field of electrochemical catalysis, in particular to an oxygen reduction catalyst and its preparation method and application. Background technique [0002] In recent years, the excessive exploitation and consumption of fossil fuels such as oil and coal, and the resulting environmental pollution have greatly affected people's daily life and seriously endangered people's health. All over the world, countries are vigorously developing clean and renewable energy technologies, such as the recent rapid rise of secondary battery technology, which has reduced environmental pollution to a certain extent, but due to the low energy density of current lithium batteries, it is not suitable For industries with high energy consumption such as long-distance transportation, it is particularly important to develop fuel cells and air batteries with high energy density, mild working conditions, and environmental friendliness. Among these tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/96
CPCH01M4/8825H01M4/90H01M4/9083H01M4/96Y02E60/50
Inventor 李德威严军表石俊峰
Owner KELAS ENVIRONMENTAL PROTECTION TECH CO LTD
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