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Nanosheets-assembled Co dendrite electrocatalyst material and preparation method thereof

An electrocatalyst and nanosheet technology, which is applied in the field of Co dendritic electrocatalyst materials and their preparation, can solve the problems of low surface area, insufficient exposure of active sites, and low catalytic activity of bulk Co catalyst materials, and achieve excellent electrolysis of hydrogen and Oxygen evolution performance, promotion of electrolytic hydrogen evolution and oxygen evolution process, simple preparation process

Inactive Publication Date: 2018-10-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Co nanoparticles are easy to agglomerate and cannot exist stably; bulk Co catalyst materials have low surface area and insufficient exposure of active sites, resulting in low catalytic activity

Method used

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  • Nanosheets-assembled Co dendrite electrocatalyst material and preparation method thereof
  • Nanosheets-assembled Co dendrite electrocatalyst material and preparation method thereof
  • Nanosheets-assembled Co dendrite electrocatalyst material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A preparation method of a Co dendritic electrocatalyst material assembled by nanosheets, comprising the following steps:

[0042] (1) Weigh 9.0g deionized water, 0.4g cobalt chloride hexahydrate, stir at room temperature until the cobalt chloride hexahydrate dissolves, and the solution is gray-green;

[0043] (2) In the mixed homogeneous solution obtained in step (1), after adding 0.5 g of sodium hydroxide, the solution gradually changes from gray green to dark blue during the stirring process, and then quickly turns pink, and then adds 1 g of the solution after the solution is uniform. Hydrazine hydrate, stirred until the solution is uniform;

[0044] (3) Pour the prepared solution into a clean reaction kettle, and react at 150 degrees Celsius for 0.5 hours.

[0045] The X-ray diffraction pattern of the Co dendritic electrocatalyst material assembled by nanosheets is shown in figure 1 . Scanning electron microscope image see figure 2 , the results of scanning elec...

Embodiment 2

[0047] A preparation method of a Co dendritic electrocatalyst material assembled by nanosheets, comprising the following steps:

[0048] (1) Weigh 9.0g deionized water, 0.4g cobalt chloride hexahydrate, stir at room temperature until the cobalt chloride hexahydrate dissolves, and the solution is gray-green;

[0049] (2) In the mixed homogeneous solution obtained in step (1), after adding 0.5 g of sodium hydroxide, the solution gradually changes from gray green to dark blue during the stirring process, and then quickly turns pink, and then adds 1 g of the solution after the solution is uniform. Hydrazine hydrate, stirred until the solution is uniform;

[0050] (3) Pour the prepared solution into a clean reaction kettle, and react for 2 hours at 150 degrees Celsius.

[0051] The X-ray diffraction pattern of the Co dendritic electrocatalyst material assembled by nanosheets is shown in Figure 4 . The results of scanning electron microscope analysis show that the product is a d...

Embodiment 3

[0053] A preparation method of a Co dendritic electrocatalyst material assembled by nanosheets, comprising the following steps:

[0054] (1) Weigh 9.0g deionized water, 0.4g cobalt chloride hexahydrate, stir at room temperature until the cobalt chloride hexahydrate dissolves, and the solution is gray-green;

[0055](2) In the mixed homogeneous solution obtained in step (1), after adding 0.5 g of sodium hydroxide, the solution gradually changes from gray green to dark blue during the stirring process, and then quickly turns pink, and then adds 1 g of the solution after the solution is uniform. Hydrazine hydrate, stirred until the solution is uniform;

[0056] (3) Pour the prepared solution into a clean reaction kettle, and react for 1 hour at 200 degrees Celsius.

[0057] The X-ray diffraction pattern of the Co dendritic electrocatalyst material assembled by nanosheets is shown in Figure 7 . The results of scanning electron microscope analysis show that the product is a den...

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Abstract

The invention provides a nanosheets-assembled Co dendrite electrocatalyst material and a preparation method thereof. The nanosheets-assembled Co dendrite electrocatalyst material is a nanosheets-staggered dendritic micro-dendrite, the size of the micro-dendrite is about 5-30 [mu]m, the dendrite is formed by mutually stacking nanosheets, the size of every nanosheet is 100-300 nm, and the thicknessof every nanosheet is 1-3 nm. The Co dendrite provided by the invention is the nanosheets-staggered dendritic micro-dendrite, can increase the exposure ratio of active sites of the material and promote the electric hydrogen evolution and oxygen evolution process, and has excellent electric hydrogen evolution and oxygen evolution effects; and the preparation method is simple, and needs no template.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical synthesis, and in particular relates to a Co dendritic electrocatalyst material oriented assembled by nanosheets and a preparation method thereof. Background technique [0002] With the increasing energy demand and deteriorating environment, it is urgent to develop sustainable and fossil-free fuels; hydrogen production by electrolysis of water has attracted great attention from the electrocatalysis community at home and abroad. Although Pt-based catalysts have excellent performance in water electrolysis for hydrogen production; however, Pt is scarce in the earth and expensive, which limits the practical application of Pt-based catalytic materials. For non-Pt materials such as transition metal Co, its reserves are abundant, the price is cheap, and it has good electrolytic hydrogen evolution and oxygen evolution performance; therefore, Co transition metals have been studied by many schola...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/02C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J23/75B01J35/00B01J35/30B01J35/33Y02E60/36
Inventor 阳晓宇余豪争王永沈乐伟刘钰龙琼玲周青苏宝连
Owner WUHAN UNIV OF TECH
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