Iron-nitrogen-carbon composite oxygen reduction catalyst as well as preparation method and application thereof

A technology of iron-nitrogen-carbon and catalyst, which is applied in the field of iron-nitrogen-carbon composite oxygen reduction catalyst and its preparation, and can solve problems such as poor activity and poor catalytic performance

Pending Publication Date: 2022-02-18
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this carbon-supported transition metal / nitrogen material has the characteristics of low cost, high strength, and easy molding, it has poor activity and poor catalytic performance.

Method used

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  • Iron-nitrogen-carbon composite oxygen reduction catalyst as well as preparation method and application thereof
  • Iron-nitrogen-carbon composite oxygen reduction catalyst as well as preparation method and application thereof
  • Iron-nitrogen-carbon composite oxygen reduction catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0029] The invention provides a method for preparing an iron-nitrogen-carbon composite oxygen reduction catalyst, comprising the following steps:

[0030] (1) gac, ferrous chloride and nitrogen source are mixed to obtain a mixture;

[0031] (2) Carbonizing the mixture obtained in the step (1) in a nitrogen atmosphere to obtain an iron-nitrogen-carbon composite oxygen reduction catalyst.

[0032] The invention mixes activated carbon, ferrous chloride and nitrogen source to obtain a mixture.

[0033] In the present invention, the activated carbon is preferably bagasse activated carbon. Compared with other activated carbons, the present invention can further increase the loading of transition metals by adopting the bagasse activated carbon, thereby further improving the catalytic activity of the catalyst.

[0034] In the present invention, the preparation method of described bagasse gac preferably comprises the steps:

[0035] 1) mixing bagasse with an activator to obtain a mi...

Embodiment 1

[0061] A preparation method of an iron-nitrogen-carbon composite oxygen reduction catalyst comprises the following steps:

[0062] (1) After mixing bagasse gac, ferrous chloride and melamine, add ethanol solution and grind repeatedly until ethanol solution volatilizes completely, obtain mixture; Wherein, the mass ratio of described bagasse gac, ferrous chloride and melamine is 1: 4:4;

[0063] (2) Carbonizing the mixture obtained in the step (1) in a nitrogen atmosphere to obtain an iron-nitrogen-carbon composite oxygen reduction catalyst; wherein, the temperature of the carbonization is 700° C., and the time is 0.5 h;

[0064] The preparation method of described bagasse gac is as follows:

[0065] 1) Bagasse is mixed with KOH at a mass ratio of 1:6 after being pulverized by a pulverizer to obtain a mixed material;

[0066] 2) Heat the mixed material obtained in step 1) in a tube furnace at a heating rate of 10°C / min to 800°C for 1h activation, after activation, wash three t...

Embodiment 2

[0069] On the basis of Example 1, the carbonization temperature was replaced by 900° C., and other steps remained unchanged, to obtain an iron-nitrogen-carbon composite oxygen reduction catalyst.

[0070] The SEM image of the iron-nitrogen-carbon composite oxygen reduction catalyst prepared in Example 2 is as follows figure 2 shown. From figure 2 It can be seen that the iron-nitrogen-carbon composite oxygen reduction catalyst presents a needle-like structure.

[0071] The TEM figure of the iron-nitrogen-carbon composite oxygen reduction catalyst prepared in Example 2 is as follows image 3 shown. From image 3 It can be seen that the black regions are iron and iron oxides, indicating that the preparation method provided by the present invention can well achieve uniform doping of transition metal iron.

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Abstract

The invention provides a preparation method of an iron-nitrogen-carbon composite oxygen reduction catalyst, which comprises the following steps: mixing activated carbon, ferrous chloride and a nitrogen source to obtain a mixture; and carbonizing the mixture in a nitrogen atmosphere to obtain the iron-nitrogen-carbon composite catalyst. Activated carbon with a high specific surface area is used as a catalyst carrier, ferrous chloride and a nitrogen source are used as active components, and the high-performance iron-nitrogen-carbon composite catalyst is prepared through carbonization in a nitrogen atmosphere. The iron-nitrogen-carbon composite catalyst is prepared by carbonization at 700-1000 DEG C, and the current density of the catalyst obtained by carbonization at a preferable interval of 750-950 DEG C in a potential interval greater than 0.85 V (relative to a reversible hydrogen electrode) is higher than that of a commercial Pt / C (20wt%) catalyst; the voltage range of a zinc-oxygen-air battery assembled by the iron-nitrogen-carbon composite oxygen reduction catalyst prepared by the preparation method disclosed by the invention is 1-1.5 V.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an iron-nitrogen-carbon composite oxygen reduction catalyst and its preparation method and application. Background technique [0002] Metal-oxygen batteries have the advantages of high conversion efficiency, high energy density and no environmental pollution, and have broad prospects in solving global problems of energy supply and clean environment. However, the high price limits its wide application. One of the most important factors is that the amount of catalyst used in metal-oxygen batteries is very large, and currently the most expensive noble metal platinum (Pt) and alloy catalysts are used. Therefore, replacing Pt catalysts with other low-cost and high-performance catalysts has become a research hotspot. [0003] Currently, carbon-supported transition metal / nitrogen (M-N x / C) materials (M=Co, Fe, Ni, Mn, etc.) have received more and more attention, for example, a carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/9083H01M4/90H01M4/88H01M12/06
Inventor 赵磊蓝兹炜田春华莫文浩
Owner LINGNAN NORMAL UNIV
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