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Spherical electrocatalytic material and preparation method thereof

An electrocatalytic material, spherical technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of complex methods and high processing temperature, and achieve accelerated transmission rate, large specific surface area, good electrocatalysis performance effect

Active Publication Date: 2019-01-11
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also uses an organic solvent, and the treatment temperature is divided into two stages, the method is complex and requires a higher treatment temperature

Method used

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  • Spherical electrocatalytic material and preparation method thereof
  • Spherical electrocatalytic material and preparation method thereof
  • Spherical electrocatalytic material and preparation method thereof

Examples

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preparation example Construction

[0050] The preparation method of the spherical electrocatalytic material of the present invention comprises mixing copper nitrate, cobalt nitrate, thioacetamide, urea and water, and reacting at 190-200°C for 17-19 hours to obtain a spherical electrocatalytic material; wherein, nitric acid Copper, cobalt nitrate, thioacetamide and urea are taken according to the molar ratio of copper, cobalt, sulfur and urea in the range of 0.5-1:1-2:2-8:1-3.

[0051] Among them, the addition of urea in the reaction is to promote the spherical CuCo 2 S 4 Synthesis, so that the raw materials can be fully reacted in the subsequent hydrothermal reaction process. The sulfur source that the present invention selects is thioacetamide, does not use common sulfur sources such as thiourea, sulfur powder, sodium sulfide, and its reason is: the melting point of thioacetamide is lower than thiourea, is easy to reaction, and the product made by using thiourea has a large amount of impurities; and sulfur p...

Embodiment 1

[0068] a, according to the molar ratio of copper, cobalt, sulfur and urea is 1:2:4.35:2.1 to get raw materials: copper nitrate trihydrate 0.23g, cobalt nitrate hexahydrate 0.56g, thioacetamide 0.31g, urea 0.12g;

[0069] B, copper nitrate trihydrate and cobalt nitrate hexahydrate are dissolved in 20g of water to obtain the first solution;

[0070] c, thioacetamide is dissolved in 20g deionized water, then add urea, obtain the second solution;

[0071] d. Pour the first solution into the second solution, and mix to obtain the third solution; carry out stirring, and then carry out hydrothermal reaction; the reaction temperature of the hydrothermal reaction is controlled at 190° C., and the reaction time is controlled at 18 hours.

[0072] e. The product after the hydrothermal reaction is washed and dried sequentially to obtain a spherical electrocatalytic material S1.

[0073] The XRD pattern of S1 is shown in Picture 1-1 , SEM image see Figure 1-2 , see the BET chart Fig...

Embodiment 2

[0075] On the basis of Example 1, the dosages of copper nitrate trihydrate, cobalt nitrate hexahydrate, thioacetamide, and urea were changed, and the temperature and reaction time of the hydrothermal reaction were changed to obtain spherical electrocatalytic materials S2-S3. For specific parameters, see Table 1.

[0076] The XRD pattern of S2 material is as follows Figure 2-1-1 As shown, the SEM image is shown in Figure 2-1-2 Shown; The XRD pattern of S3 material is as Figure 2-2-1 As shown, the SEM image is shown in Figure 2-2-2 shown. It can be seen from the figure that S2~S3 can prepare spherical CuCo 2 S 4 Material, the main component of the material is CuCo 2 S 4 , but contains impurities, and some of them are in poor shape.

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Abstract

The invention relates to a spherical electrocatalytic material and a preparation method thereof, and belongs to the field of electrode materials. The spherical electrocatalytic material has the molecular formula of CuCo2S4. A structure of the material is a spherical structure having the diameter of 1-3 [mu]m and formed by aggregation of nanosheets, and gaps exist between the nanosheets. The structure not only has a large specific surface area and can speed up the electron transport rate, but also can provide abundant active sites and are attached with more discharge products; the prepared spherical electrocatalytic material is indicated to have excellent Li<+> storage performance, and can easily provide more active sites to promote implementation of ORR (oxygen reduction reaction) and OER(oxygen precipitation reaction) when being used as an electrocatalyst for a lithium-oxygen battery, and is also conducive to electron and oxygen transport.

Description

technical field [0001] The invention relates to a spherical electrocatalytic material and a preparation method thereof, belonging to the field of electrode materials. Background technique [0002] The lithium-oxygen battery is a new type of fuel cell in which metallic lithium is used as the negative electrode and oxygen is used as the positive electrode. Lithium-oxygen batteries have the advantages of high theoretical energy density, abundant sources of positive electrode materials, green and pollution-free, recyclable, and low cost, and are a good energy storage device. Although lithium-oxygen batteries have the above advantages, due to the high charging overpotential and hysteresis oxygen reduction reaction kinetics, the electrochemical performance of lithium-oxygen batteries during charge and discharge is not good, and it also reduces the capacity of lithium-oxygen batteries. cycle life. [0003] Ternary copper cobalt sulfide (CuCo 2 S 4 ) has been widely used in supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00B01J27/043B01J35/00B01J35/08
CPCC01G51/006B01J27/043C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2006/12C01P2004/50B01J35/33B01J35/51
Inventor 龙剑平候志前舒朝著杨梅梁冉曦
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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