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A kind of supported lithium-doped tricobalt tetroxide nanocomposite catalyst and preparation method thereof

A nano-composite catalyst technology of cobalt trioxide, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as weak conductivity and lack of cobalt resources, and achieve Effects of overcoming weak conductivity and improving catalytic performance and electrochemical performance

Active Publication Date: 2016-08-31
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Co 3 o 4 The electrical conductivity is weak, and the cobalt resources in our country are relatively scarce, so the increase of Co 3 o 4 The electrical conductivity of cobalt-based catalysts while reducing the amount of cobalt is the main research direction of cobalt-based catalysts

Method used

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  • A kind of supported lithium-doped tricobalt tetroxide nanocomposite catalyst and preparation method thereof
  • A kind of supported lithium-doped tricobalt tetroxide nanocomposite catalyst and preparation method thereof
  • A kind of supported lithium-doped tricobalt tetroxide nanocomposite catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of lithium-doped lithium-doped tricobalt oxide catalyst with 5% loading:

[0025] (1) Prepare an ethanol solution of lithium salt and cobalt salt with a lithium-cobalt molar ratio of 1:20, add carbon black acidified with nitric acid into the solution, and add a mass ratio of cobalt salt and carbon black of 1.55:1, and ultrasonically disperse for 20 minutes , adjusting the pH value of the solution with ammonia water to 8-12, and ultrasonically dispersing for 20 minutes to obtain a mixed solution containing cobalt acetate, lithium acetate and carbon black carrier;

[0026] (2) Pour the mixed solution into a round-bottomed flask, condense and reflux under magnetic stirring, control the temperature of the oil bath at 50°C-150°C, and the reaction time is 4-12h. After the reaction, cool naturally;

[0027] (3) Pour the reaction solution into a hydrothermal reaction kettle, put it into an oven for hydrothermal reaction, the temperature of the hydrothermal reaction ...

Embodiment 2

[0030] Preparation of lithium-doped lithium-doped tricobalt oxide catalyst with 10% loading:

[0031] (1) Prepare an ethanol solution of lithium salt and cobalt salt with a lithium-cobalt molar ratio of 1:10, add carbon black acidified with nitric acid into the solution, and add a mass ratio of cobalt salt and carbon black of 1.55:1, and ultrasonically disperse for 20 minutes , adjusting the pH value of the solution with ammonia water to 8-12, and ultrasonically dispersing for 20 minutes to obtain a mixed solution containing cobalt acetate, lithium acetate and carbon black carrier;

[0032] (2) Pour the mixed solution into a round-bottomed flask, condense and reflux under magnetic stirring, control the temperature of the oil bath at 50°C-150°C, and the reaction time is 4-12h. After the reaction, cool naturally;

[0033] (3) Pour the reaction solution into a hydrothermal reaction kettle, put it into an oven for hydrothermal reaction, the temperature of the hydrothermal reaction...

Embodiment 3

[0036] Preparation of lithium-doped lithium-doped tricobalt oxide catalyst with 20% loading:

[0037] (1) Prepare an ethanol solution of lithium salt and cobalt salt with a lithium-cobalt molar ratio of 1:5, add carbon black acidified with nitric acid into the solution, and add a mass ratio of cobalt salt and carbon black of 1.55:1, and ultrasonically disperse for 20 minutes , adjusting the pH value of the solution with ammonia water to 8-12, and ultrasonically dispersing for 20 minutes to obtain a mixed solution containing cobalt acetate, lithium acetate and carbon black carrier;

[0038] (2) Pour the mixed solution into a round-bottomed flask, condense and reflux under magnetic stirring, control the temperature of the oil bath at 50°C-150°C, and the reaction time is 4-12h. After the reaction, cool naturally;

[0039] (3) Pour the reaction solution into a hydrothermal reaction kettle, put it into an oven for hydrothermal reaction, the temperature of the hydrothermal reaction is...

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Abstract

The invention relates to a supported lithium-doped cobaltosic oxide composite catalyst and a preparation method thereof. The catalyst, for an oxygen reduction reaction in an alkaline medium, has relatively high electro-catalytic activity and durability. The supported lithium-doped cobaltosic oxide composite catalyst, prepared by a hydrothermal method, is in the form of solid powder, simple in preparation process and easily controlled in particle size. Grain size of the prepared lithium-doped cobaltosic oxide is about 5nm, and the particles are uniformly loaded on the surface of acidified carbon black. The doping of lithium is not only beneficial for improving catalytic performance of cobaltosic oxide on the oxygen reduction reaction but also capable of enhancing conductivity of the cobaltosic oxide; and the catalyst is applicable to oxygen reduction on the cathode of a lithium-air battery.

Description

technical field [0001] The invention relates to a supported lithium-doped tricobalt tetroxide nanocomposite catalyst and a preparation method thereof. The catalyst has excellent catalytic activity for the oxygen reduction reaction, and can be used as a catalyst for the oxygen reduction reaction or as a cathode material for a lithium-ion battery. Background technique [0002] Oxygen reduction reaction is widely used in clean energy and has always been the focus of research in the field of electrochemistry. However, the redox reaction itself is relatively slow, and a catalyst needs to be added to promote the reaction. Therefore, the research on oxygen reduction catalysts is of great importance. significance. At present, platinum-based materials are the best materials for oxygen reduction catalytic activity, but their high price and poor stability limit their applications. Therefore, it is of great significance to prepare a catalyst with catalytic activity comparable to plati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J35/02
Inventor 王峰刘景军刘红灿宋夜李志林宋薇薇吉静
Owner BEIJING UNIV OF CHEM TECH