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Co dendrite electrocatalyst and preparation method thereof

A technology of electrocatalysts and nanorods, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of less active sites for oxygen production, poor oxygen production performance, and small specific surface area. To achieve the effect of promoting the process of electrolysis of oxygen and increasing the exposure ratio

Inactive Publication Date: 2021-03-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanoscale Co metal particles have good electrocatalytic oxygen generation ability, but poor long-term stability and easy to agglomerate; micron bulk Co metal, due to the small specific surface area, has fewer exposed oxygen generation active sites, resulting in poor oxygen generation performance

Method used

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  • Co dendrite electrocatalyst and preparation method thereof
  • Co dendrite electrocatalyst and preparation method thereof
  • Co dendrite electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 3.0 g of trimesic acid and 0.6 g of titanium dioxide P25, dissolve the two together in a solution prepared from 5 ml of ethanol and 10 ml of deionized water, and stir until the solution is uniform;

[0028] (2) Pour the prepared solution into a clean hydrothermal reaction kettle, conduct a hydrothermal reaction at 100°C for 24 hours, then wash and dry;

[0029] (3) configure 0.1mol / L cobalt chloride hexahydrate aqueous solution and 25mol / L sodium hydroxide aqueous solution respectively;

[0030] (4) Measure 10ml of the cobalt chloride hexahydrate aqueous solution obtained in step (3) in a beaker, add 150mg of titanium dioxide P25 obtained in step (2), stir to obtain a homogeneous solution, and then add 0.5ml of the obtained solution in step (3) Sodium hydroxide aqueous solution, stir to obtain a uniform solution, then add 1.5ml of hydrazine hydrate, stir until the solution is uniform;

[0031] (5) Pour the prepared solution into a clean hydrothermal reaction ...

Embodiment 2

[0036] (1) Weigh 3.0 g of trimesic acid and 0.6 g of titanium dioxide P25, dissolve the two together in a solution prepared from 5 ml of ethanol and 10 ml of deionized water, and stir until the solution is uniform;

[0037] (2) Pour the prepared solution into a clean hydrothermal reaction kettle, conduct a hydrothermal reaction at 100°C for 24 hours, then wash and dry;

[0038] (3) configure 0.1mol / L cobalt chloride hexahydrate aqueous solution and 25mol / L sodium hydroxide aqueous solution respectively;

[0039] (4) Measure 10ml of the cobalt chloride hexahydrate aqueous solution obtained in step (3) in a beaker, add 50mg of P25 obtained in step (2), stir to obtain a homogeneous solution, and then add 0.5ml of hydrogen obtained in step (3) Sodium oxide aqueous solution, stir to obtain a uniform solution, then add 1.5ml of hydrazine hydrate, stir until the solution is uniform;

[0040] (5) Pour the prepared solution into a clean hydrothermal reaction kettle, and conduct a hydr...

Embodiment 3

[0045] (1) Weigh 3.0 g of trimesic acid and 0.6 g of titanium dioxide P25, dissolve the two together in a solution prepared from 5 ml of ethanol and 10 ml of deionized water, and stir until the solution is uniform;

[0046] (2) Pour the prepared solution into a clean hydrothermal reaction kettle, conduct a hydrothermal reaction at 100°C for 24 hours, then wash and dry;

[0047] (3) configure 0.1mol / L cobalt chloride hexahydrate aqueous solution and 25mol / L sodium hydroxide aqueous solution respectively;

[0048] (4) Measure 10ml of the cobalt chloride hexahydrate aqueous solution obtained in step (3) in a beaker, add 10mg of P25 obtained in step (2), stir to obtain a homogeneous solution, and then add 0.5ml of hydrogen obtained in step (3) Sodium oxide aqueous solution, stir to obtain a uniform solution, then add 1.5ml of hydrazine hydrate, stir until the solution is uniform;

[0049] (5) Pour the prepared solution into a clean hydrothermal reaction kettle, and conduct a hydr...

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Abstract

The invention discloses a Co dendrite electrocatalyst directionally assembled by nanorods and the Co dendrite electrocatalyst. The Co dendrite electrocatalyst is micron dendrite formed by directionalassembly of nanorods and has size of 5-15 mu m, and nanorods have length of 3-10 mu m and diameter of 0.3-1 mu m. An ethanol aqueous solution of trimellitic acid and titanium dioxide P25 is prepared,and stirred until the solution is uniform; the solution is added to a hydrothermal reaction kettle to be heated to 80-120 DEG C for hydrothermal reaction for 12-24 h, then washing and drying are performed, and modified titanium dioxide P25 is obtained; modified titanium dioxide P25 is added to a cobalt chloride hexahydrate aqueous solution, the mixed solution is stirred, and a sodium hydroxide aqueous solution and hydrazine hydrate are added; the mixture is added to the hydrothermal reaction kettle and subjected to hydrothermal reaction at 150-200 DEG C for 0.5-1.5 h. The obtained Co dendriteelectrocatalyst directionally assembled by the nanorods can increase the exposure ratio of active sites of the material, promote the electro-oxygen evolution process, and provides a new idea for expanding the structure and application range of common Co metal materials.

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 nanorods and a preparation method thereof. Background technique [0002] With the increasing demand for energy and the deteriorating environment, it is urgent to develop sustainable and fossil-free fuels. The electrolysis of water has attracted great attention from the electrocatalysis community at home and abroad. However, the half reaction of oxygen production is slower than that of hydrogen production, which restricts the development of electrolysis of water. Although Ru and Ir-based catalysts have excellent oxygen production performance in water electrolysis; however, Ru and Ir are scarce in the earth and expensive, which limits the practical application of Ru and Ir-based catalytic materials. For non-Pt materials such as transition metal Co, it is abundant in reserves, cheap, and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J35/02B01J37/10B01J37/16C25B1/04C25B11/091
CPCB01J23/75B01J35/0033B01J35/02B01J37/10B01J37/16C25B1/04C25B11/04Y02E60/36
Inventor 阳晓宇余豪争周青王永常刚刚田歌
Owner WUHAN UNIV OF TECH
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