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Isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material and preparation method and application thereof

A technology of tricobalt tetroxide and core-shell structure, which is applied in the manufacture of hybrid/electric double layer capacitors and hybrid capacitor electrodes, etc., can solve the problems of poor electrochemical properties of electrode materials, and achieve the effects of easy regulation, simple operation and low cost

Active Publication Date: 2017-01-18
ANHUI NORMAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Same in Co 3 o 4 @MnO 2 In the journal, Co 3 o 4 @MnO 2 Electrochemical properties of electrode materials are not good

Method used

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  • Isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material and preparation method and application thereof
  • Isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material and preparation method and application thereof
  • Isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material and preparation method and application thereof

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preparation example Construction

[0024] The invention provides a method for preparing isomorphic cobalt tetroxide@cobalt tetroxide core-shell structure material, comprising:

[0025] 1) Contact reaction of soluble cobalt salt, amine fluoride, urea, water and nickel foam, cleaning, drying and annealing to obtain basic Co 3 o 4 monomer;

[0026] 2) Hexamethylenetetramine, soluble cobalt salt, ethanol, water and basic Co 3 o 4 The monomer is hydrothermally reacted, washed, dried, and annealed to obtain isomorphic cobalt tetroxide@cobalt tetroxide core-shell structure material.

[0027] In step 1) of the above preparation method, the amount of each material can be selected in a wide range, but in order to make the prepared core-shell structure material have more excellent specific capacitance and cycle stability, preferably, in step 1) In, relative to the soluble cobalt salt of 1.0-3.0mmol, the consumption of amine fluoride is 3.0-5.0mmol, and the consumption of urea is 8-12mmol; More preferably, relative to ...

Embodiment 1

[0037] 1) Stir 2mmol of cobalt chloride, 4mmol of ammonium fluoride, 10mmol of urea and 30mL of deionized water into the reaction kettle, then add a piece of nickel foam (0.2-0.3g) treated with hydrochloric acid into the kettle and place in React at 100°C for 10h, wash, dry at 60°C for 12h, and anneal at 320°C for 2h to obtain the basic Co 3 o 4 monomer;

[0038] 2) the above basic Co 3 o 4 Monomer (0.4mmol), 1.5mmol hexamethylenetetramine and 0.5mmol cobalt nitrate were added to 20mL deionized water and 10mL ethanol and stirred into a uniform solution, then the above mixed system was transferred to the reaction kettle at 90 React at ℃ for 12 hours, take it out after cooling, wash with deionized water and absolute ethanol three times respectively, dry at 60℃, and anneal at 320℃ for 3h, then the isomorphic tricobalt tetroxide@cobalt tetraoxide core-shell structure material A1 can be obtained.

Embodiment 2

[0040] 1) Stir 2.5mmol of cobalt chloride, 4.5mmol of ammonium fluoride, 10.5mmol of urea and 35mL of deionized water into the reaction kettle, then add a piece of nickel foam (0.2-0.3g ) and react at 110°C for 9h, wash, dry at 60°C for 12h, and anneal at 340°C for 2h to obtain the basic Co 3 o 4 monomer;

[0041] 2) the above basic Co 3 o 4 Monomer (0.5mmol), 1.7mmol hexamethylenetetramine and 0.7mmol cobalt nitrate were added to 30mL deionized water and 10mL ethanol and stirred into a uniform solution, then the above mixed system was transferred to the reaction kettle at 100 React at ℃ for 10 hours, take it out after cooling, wash with deionized water and absolute ethanol three times respectively, dry at 60℃, and anneal at 300℃ for 3 hours to prepare the isomorphic tricobalt tetroxide @ tricobalt tetroxide core-shell structure material A2.

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Abstract

The invention discloses an isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material and a preparation method and application thereof. The preparation method comprises: (1), haptoreaction, cleaning, drying, and annealing are carried out on soluble cobalt salt, ammonium fluoride, urea, water and foamed nickel to obtain an alkaline Co3O4 monomer; and (2), hydrothermal reaction, cleaning, drying, and annealing are carried out on methenamine, soluble cobalt salt, ethyl alcohol, water and the alkaline Co3O4 monomer to obtain a isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material. With the method, the isomorphous cobaltosic oxide@cobaltosic oxide nuclear shell structure material with high specific capacitance and cycling stability can be prepared; and the material can be used as an electronic material of an electrochemical capacitor. Meanwhile, the preparation method has advantages of simple operation, low cost, mild condition, and good going-green and environment-friendly effects.

Description

technical field [0001] The present invention relates to Co 3 o 4 The material, specifically, relates to isomorphic cobalt tetroxide@cobalt tetroxide core-shell structure material and its preparation method and application. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, play an important role in complementing Li-ion batteries for energy storage due to their high power density, fast ion exchange rate, and long cycle life. The performance of electrochemical capacitors depends largely on its electrode materials, and has a crucial relationship with the structure of electrode materials. [0003] The current electrode materials are mainly transition metal materials, such as transition metal oxides and sulfides, mixed transition metal oxides and conductive polymers. Generally, transition metal materials with a single structure have defects such as small specific capacitance, poor rate performance, and unstable cycle, so it is critical to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/86
CPCY02E60/13H01G11/24H01G11/46H01G11/86
Inventor 王秀华方瑶
Owner ANHUI NORMAL UNIV
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