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A method for rapidly preparing a large amount of flower-like cobalt-based double hydroxides

A hydroxide and bimetal technology, applied in the field of electrocatalysis, can solve problems such as cumbersome methods, and achieve the effects of simple operation, wide application range and short preparation time

Active Publication Date: 2021-06-15
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-based materials are considered to have good prospects in replacing noble metal-based catalysts. At present, the methods for preparing cobalt-based OER catalysts are relatively cumbersome, or need to use reactors for long-term reactions at high temperature and pressure.

Method used

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  • A method for rapidly preparing a large amount of flower-like cobalt-based double hydroxides
  • A method for rapidly preparing a large amount of flower-like cobalt-based double hydroxides
  • A method for rapidly preparing a large amount of flower-like cobalt-based double hydroxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix 25mL of 125mmol / L methanol dispersion of cobalt nitrate hexahydrate and 10mL of 250mmol / L methanol dispersion of 2-methylimidazole, the concentration of cobalt nitrate hexahydrate in the resulting mixture is 89.29mmol / L, 2-methylimidazole The concentration of imidazole is 71.42mmol / L, and the molar ratio of cobalt nitrate hexahydrate and 2-methylimidazole is 1:0.8, and ultrasonic cleaner is used for 30 minutes at room temperature under the condition of power of 800W and frequency of 40KHz to prepare flower like Co-LDH.

[0029] Adopt XRD, scanning electron microscope, transmission electron microscope, electron energy spectrum to carry out characterizing to above-mentioned obtained sample, the result sees Figure 1~6 . Depend on figure 1 It can be seen that the sample is a monodisperse flower-like ball of 2-3 μm, composed of figure 2 The transmission electron microscope photo of the single particle of the sample shows that the sample is composed of a very thin si...

Embodiment 2

[0032] In this example, ultrasonication was performed at 0°C for 30 minutes, and the other steps were the same as in Example 1 to prepare flower-like Co-LDH with relatively small particles (see Figure 9 ).

Embodiment 3

[0034] In the present embodiment, the methanol dispersion of 25mL 125mmol / L cobalt nitrate hexahydrate and the methanol dispersion of 5mL 250mmol / L 2-methylimidazole were mixed evenly, and the concentration of cobalt nitrate hexahydrate in the resulting mixed solution was 104.17mmol / L , the concentration of 2-methylimidazole is 41.67mmol / L, and the mol ratio of hexahydrate cobalt nitrate and 2-methylimidazole is 1:0.4, and other steps are identical with embodiment 1, prepare flower shape Co-LDH (see Figure 10 ).

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Abstract

The present invention has opened a kind of method of rapidly preparing a large amount of flower-shaped cobalt-based double metal hydroxides, and the method mixes the methanol dispersion of cobalt nitrate hexahydrate and the methanol dispersion of 2-methylimidazole evenly, so that The concentration of cobalt nitrate hexahydrate is 75~105mmol / L, the concentration of 2-methylimidazole is 30~125mmol / L, and the molar ratio of cobalt nitrate hexahydrate and 2-methylimidazole is 1:0.3~1.2, at 0 Sonication at ~50°C for 20 to 40 minutes to prepare flower-like cobalt-based double hydroxide (Co‑LDH) with regular shape and monodisperse shape. The Co-LDH synthesized by the method of the present invention has very excellent OER performance, and its η 10 =309mV, it has a very excellent advantage in replacing noble metal catalyzed electrolysis of water.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a method for rapidly preparing a large amount of flower-shaped cobalt-based double metal hydroxide (Co-LDH). Background technique [0002] Hydrogen energy is an ideal clean energy, which has great advantages and broad prospects unparalleled by other new energy sources. Although the hydrogen resources on the earth are very abundant, they are mainly in the form of water (H 2 O) exists in the form of hydrogen molecules (H 2 ) are present in very small amounts. Therefore, the production of hydrogen is the primary link in the large-scale use of hydrogen energy. At present, the hydrogen production technology in the alkaline electrolytic cell is the most mature, and has begun to be used in the industry to produce high-purity hydrogen. In the face of the problem of high energy consumption in the alkaline hydrogen production industry, the development of efficient,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04B01J23/75C25B11/091B01J35/33Y02E60/36
Inventor 邓字巍刘晓洋陈煜薛琪马艳玲刘松宇蒙婷婷
Owner SHAANXI NORMAL UNIV