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A method for preparing single-layer porous cobalt oxyhydroxide nanosheets by electrochemical oxidation

A technology of cobalt oxyhydroxide and electrocatalytic oxidation, applied in the field of electrochemistry, can solve problems such as unreported cobalt oxyhydroxide, and achieve the effects of high porosity, low energy consumption and simple process flow

Active Publication Date: 2021-07-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that researchers have successfully prepared cobalt oxyhydroxide nanomaterials with various shapes such as spherical, rod and flake shapes. However, the preparation of cobalt oxyhydroxide with single-layer porous nanosheets has not yet been reported.

Method used

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  • A method for preparing single-layer porous cobalt oxyhydroxide nanosheets by electrochemical oxidation
  • A method for preparing single-layer porous cobalt oxyhydroxide nanosheets by electrochemical oxidation
  • A method for preparing single-layer porous cobalt oxyhydroxide nanosheets by electrochemical oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1.8 g of tetrahydrate cobalt is dissolved in 100 mL of ethylene glycol, 0.6 g of polyvinylpyridone, 5 mL distilled water, thoroughly stirred 30 min to all dissolved to form a transparent clear solution. The transparent solution was transferred to a 250 mL of crystallization tank, sealed, and reacted at 220 ° C for 6 h. After the reaction is completed, the hydrotherm is rinsed quickly to the room temperature to room temperature. The resulting suspension was centrifuged to give precipitation, and then the resulting precipitate was washed 3 times with anhydrous ethanol, dried at 50 ° C for 10 h, i.e., a pink precursor.

[0027] The above-mentioned pink precursor 100 mg was taken to 1 * 1 cm carbon paper as the working electrode, and the 0.1 M KOH solution is an electrolyte. In constant current density (10mA cm -2 Electrolytic 3 h can be obtained from a single layer of porous hydroxy cobalt oxide. The SEM map of the product is attached figure 1 . Depend on figure 1 It can be se...

Embodiment 2

[0029] 0.9 g of cobalt nitrate was dissolved in 100 mL of ethylene glycol, and 0.3 g of polyvinylpyrone is added, and stir well to all dissolved. 5 ml of distilled water was added, stirred for 30 min to form a transparent solution. The transparent solution was transferred to a 250 ml of crystallization tank, sealed, and reacted at 200 ° C for 12 h. After the reaction is completed, the hydrotherm is rinsed quickly to the room temperature to room temperature. The resulting suspension was centrifuged to give precipitation, and the resulting precipitate was washed 3 times with isopropyl alcohol, and the pink precursor was obtained at 50 ° C for 10 h.

[0030] The pink precursor 120 mg was taken, dispersed onto a carbon paper of 2 * 2 cm, as the working electrode, and 1 M KOH solution as an electrolyte. In constant current density (5mA cm -2 Electrolytic 6 h can be obtained from a single layer porous hydroxy cobalt oxide, and its TEM is attached. figure 2 . Depend on figure 2 It can be...

Embodiment 3

[0032] 0.5 g of cobalt chloride was dissolved in 50 ml of ethylene glycol, and 0.3 g of polyvinylpyrol alkone was added, and stirred well until all dissolved. 5 ml of distilled water was added, stirred for 30 min to form a transparent solution. The transparent solution was transferred to a 250 ml crystallization tank, sealed, at 150 ° C for 24 h. After the reaction is completed, the hydrotherm is rinsed quickly to the room temperature to room temperature. The resulting suspension was centrifuged to obtain precipitation, and the resulting precipitate was washed 3 times with tert-butanol, dried at 50 ° C for 10 h, i.e., a pink precursor.

[0033] Take the above-described pink precursor 200 mg, dispersed onto a carbon paper of 3 * 3 cm, as the working electrode, and 5M KOH solution as an electrolyte. In constant current density (20 mA cm -2 The electrolytic 1 h can be obtained from a single layer of porous hydroxy cobalt oxide, and the XRD figure is attached. image 3 . Depend on imag...

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Abstract

The invention relates to the field of electrochemistry, in particular to a method for preparing single-layer porous cobalt oxyhydroxide nanosheets by an electrochemical oxidation method. React the cobalt salt dispersed by the dispersant in a hydrothermal kettle at 150-220°C for 3-24 hours, cool down to room temperature after the reaction, centrifuge the suspension to obtain a precipitate, wash the precipitate repeatedly with an organic solvent, dry the obtained precipitate and then remove it In the electrolyte of the alkaline solution, the single-layer porous cobalt oxyhydroxide nanosheet can be obtained by electrocatalytic oxidation at a constant current density. The invention has the advantages of mild reaction conditions, simple process flow, low energy consumption, and large-scale production. The obtained product has the advantages of narrow pore size distribution, high porosity, large specific surface area, and good repeatability between batches. It has been widely used in the fields of batteries, supercapacitors and electrocatalysis.

Description

Technical field [0001] The present invention relates to an electrochemical field, particularly a method of preparing mono-layer porous hydroxyl cobalt oxide nanoflets in an electrochemical oxidation method. Background technique [0002] In recent years, hydroxycobalt cobalt has been received in a wide range of applications in many fields such as lithium-ion batteries, supercapacitors, and electrocatalysis. In the lithium ion battery, hydroxy oxide is often used as a cobalt source to produce a positive electrode active material of a lithium ion battery, and lithium cobaltate, while it can also improve the battery capacity and cycle life as a battery additive. In terms of the application of supercapacitors, the supercapacitor prepared by hydroxycarbonide as an electrode material is used, and a higher capacitance characteristic is usually exhibited. In the field of electrocatalysis, cobalt oxycal oxide exhibits excellent catalytic activity in electrocatalytic oxygenation, and is con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/46H01M4/525
CPCH01G11/24H01G11/46H01M4/525Y02E60/10Y02E60/13
Inventor 梁汉璞杜健李超王西龙陈国栋
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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