Preparation method and application of Zn/Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth

A carbon nanotube and catalyst technology, applied in the field of electrochemical energy, can solve the problems of high price, scarce reserves, poor cycle stability, etc., and achieve high power density, excellent oxygen reduction activity, and good cycle stability.

Pending Publication Date: 2021-11-02
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pt-based catalysts have problems such as high price, scarce reserves, and poor cycle stability. Therefore, it is urgent to develop new low-Pt or non-Pt efficient oxygen reduction catalysts to promote the development of fuel cells.

Method used

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  • Preparation method and application of Zn/Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth
  • Preparation method and application of Zn/Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth
  • Preparation method and application of Zn/Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step S1: Disperse 6.5g of 2-methylimidazole into 100mL of methanol, ultrasonicate for 5min to obtain a uniform solution A, disperse 3g of zinc nitrate hexahydrate into 50mL of methanol, ultrasonically for 5min to obtain a uniform solution B, and then dissolve solution B quickly Pour into solution A and stir at room temperature for 24 hours to obtain material A1;

[0034] Step S2: Centrifuge material A1 at a rotational speed of 10000 r / min, wash with methanol three times, and then vacuum dry at 80° C. for 6 hours to obtain material B1;

[0035] Step S3: Transfer the material B2 to a corundum boat and place it in a tube furnace. In an inert gas atmosphere, first raise the temperature from room temperature to 300°C for 55 minutes and keep it for 60 minutes, then raise the temperature to 900°C at a rate of 5°C / min. Keep for 180min, then naturally cool to room temperature to obtain material C1;

[0036] Step S4: Transfer the material C1 into a hydrochloric acid solution wit...

Embodiment 2

[0038] Step S1: Disperse 6.5g of 2-methylimidazole in 100mL of methanol, ultrasonicate for 5min to obtain uniform solution A, disperse 3g of zinc nitrate hexahydrate and 0.2g of graphene oxide in 50mL of methanol, ultrasonicate for 5min to obtain uniform solution B , then quickly pour solution B into solution A and stir at room temperature for 24 hours to obtain material A2;

[0039] Step S2: Centrifuge the material A2 at a speed of 10,000 r / min, wash it three times with methanol, and then vacuum-dry it at 80° C. for 6 hours to obtain material B2;

[0040] Step S3: Transfer the material B2 to a corundum boat and place it in a tube furnace. In an inert gas atmosphere, first raise the temperature from room temperature to 300°C for 55 minutes and keep it for 60 minutes, then raise the temperature to 900°C at a rate of 5°C / min. Keep for 180min, then naturally cool to room temperature to obtain material C2;

[0041] Step S4: Transfer the material C2 to a 2M hydrochloric acid solut...

Embodiment 3

[0043] Step S1: Disperse 6.5g of 2-methylimidazole into 100mL of methanol, ultrasonicate for 5min to obtain a uniform solution A, disperse 3g of zinc nitrate hexahydrate and 0.514g of cobalt(III) acetylacetonate into 50mL of methanol, and ultrasonicate for 5min to obtain a uniform solution B, then quickly pour solution B into solution A and stir at room temperature for 24 hours to obtain material A3;

[0044] Step S2: Centrifuge the material A3 at a rotation speed of 10,000 r / min, wash with methanol three times, and then vacuum-dry at 80° C. for 6 hours to obtain material B3;

[0045] Step S3: Transfer material B3 to a corundum boat and place it in a tube furnace. In an inert gas atmosphere, first raise the temperature from room temperature to 300°C for 55 minutes and keep it for 60 minutes, then raise the temperature to 900°C at a heating rate of 5°C / min. Keep for 180min, then naturally cool to room temperature to obtain material C3;

[0046] Step S4: Transfer the material C...

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Abstract

The invention discloses a preparation method and application of a Zn / Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth. The preparation method comprises the following steps: stirring a methanol dispersion of 2-methylimidazole zinc salt and a methanol dispersion of zinc nitrate hexahydrate, graphene oxide and cobalt acetylacetonate (III) at room temperature to obtain a mixture; carrying out centrifugation, methanol washing and drying treatment, carrying out high-temperature calcination under the protection of inert gas, and cooling to room temperature; and soaking the product in acid, washing for multiple times, and drying to obtain the target product Zn / Co-N-C carbon nanotube oxygen reduction catalyst. The carbon nanotube oxygen reduction catalyst prepared by the invention has a hierarchical porous property, and shows excellent oxygen reduction activity, cycling stability and methanol tolerance in both alkaline and acidic electrolytes. When the prepared carbon nanotube oxygen reduction catalyst is applied to a cathode of a zinc air battery, good power density and satisfactory cycling stability are shown.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, in particular to a preparation method and application of a self-catalyzed growth Zn / Co-N-C carbon nanotube oxygen reduction catalyst. Background technique [0002] The excessive use of fossil fuels in contemporary society has caused serious global pollution and energy crises, so it is imminent to explore a new generation of renewable clean energy. Fuel cells, especially metal-air batteries, are considered to be one of the most promising energy conversion devices due to their high energy density and energy conversion efficiency. The development bottleneck of the large-scale application of fuel cells lies in the slow kinetic rate of the cathode oxygen reduction reaction, which usually requires noble metal catalysts such as Pt to meet the high current output. Pt-based catalysts have problems such as high price, scarce reserves, and poor cycle stability. Therefore, it is urgent to develop new l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B22F9/20C01B32/16
CPCH01M4/88H01M4/9041H01M4/9083B22F9/20C01B32/16Y02E60/50
Inventor 张静张风仙杨天芳王坤刘云鹏张翠翠李晓沣刘洋高书燕
Owner HENAN NORMAL UNIV
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