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Nickel-cobalt-molybdenum ternary metal sulfide as well as preparation method and application thereof

A ternary metal and sulfide technology, used in nickel compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of insufficiency of morphology, unfavorable electrode material and electrolyte infiltration, general electrochemical performance, etc. Specific capacity and energy density, good commercial application value, excellent electrochemical performance

Active Publication Date: 2020-03-27
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing transition metal sulfides are generally prepared by a two-step hydrothermal method, first synthesizing the metal hydroxide precursor, and then performing hydrothermal vulcanization, the preparation process is cumbersome, and it is easy to release H 2 S gas, not friendly to the ecological environment
Moreover, the existing ternary transition metal sulfides generally have problems such as irregular morphology and small specific surface area, which are not conducive to the infiltration of electrode materials and electrolytes, and the actual electrochemical performance is relatively general, which is difficult to meet the needs.

Method used

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  • Nickel-cobalt-molybdenum ternary metal sulfide as well as preparation method and application thereof
  • Nickel-cobalt-molybdenum ternary metal sulfide as well as preparation method and application thereof
  • Nickel-cobalt-molybdenum ternary metal sulfide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of nickel cobalt molybdenum ternary metal sulfide, its preparation method comprises the following steps:

[0039] 1) Fully dissolve 0.375g nickel chloride and 0.125g cobalt chloride in 150mL deionized water to obtain nickel chloride-cobalt chloride aqueous solution, fully dissolve 0.545g ammonium thiomolybdate in 50mL absolute ethanol and 200mL deionized The ethanol-water solution of ammonium thiomolybdate was obtained in the mixed solvent composed of water, and the nickel chloride-cobalt chloride aqueous solution was slowly added dropwise to the ethanol-water solution of ammonium thiomolybdate while stirring at room temperature, and the stirring rate was 350r / min, the stirring time is 6h, then vacuum filtration, wash the obtained solid three times with ethanol and distilled water respectively, and then vacuum dry at 80°C for 12h;

[0040] 2) Put the product of step 1) into a tube furnace, place it in a nitrogen atmosphere, heat up to 400°C at a rate of 2°C / min,...

Embodiment 2

[0053] A kind of nickel cobalt molybdenum ternary metal sulfide, its preparation method comprises the following steps:

[0054] 1) operation is with the step 1) of embodiment 1;

[0055] 2) Put the product of step 1) into a tube furnace, place it in a nitrogen atmosphere, heat up to 400°C at a rate of 2°C / min, and then calcinate for 2 hours to obtain a massive nickel-cobalt-molybdenum ternary metal sulfide crude product;

[0056] 3) Disperse the product of step 2) in an ethanol-water solution of NaOH with a concentration of 2mol / L (the volume ratio of ethanol and water is 7:1), then transfer the material to a hydrothermal kettle, and react at a constant temperature of 200°C for 24h, and then Carry out centrifugation, the solid obtained by centrifugation is washed with water, then placed in 80 ℃ oven drying 12h, obtain nickel cobalt molybdenum ternary metal sulfide (Ni 0.75 co 0.25 MoS 4 ).

[0057] Performance Testing:

[0058] 1) SEM image of nickel-cobalt-molybdenum ter...

Embodiment 3

[0064] A kind of nickel cobalt molybdenum ternary metal sulfide, its preparation method comprises the following steps:

[0065] 1) operation is with the step 1) of embodiment 1;

[0066] 2) Put the product of step 1) into a tube furnace, place it in a nitrogen atmosphere, heat up to 400°C at a rate of 2°C / min, and then calcinate for 2 hours to obtain a massive nickel-cobalt-molybdenum ternary metal sulfide crude product;

[0067] 3) Disperse the product of step 2) in an ethanol-water solution of NaOH with a concentration of 2mol / L (the volume ratio of ethanol and water is 7:1), then transfer the material to a hydrothermal kettle, react at a constant temperature of 180°C for 24h, and then Carry out centrifugation, the solid obtained by centrifugation is washed with water, then placed in 80 ℃ oven drying 12h, obtain nickel cobalt molybdenum ternary metal sulfide (Ni 0.75 co 0.25 MoS 4 ).

[0068] Performance Testing:

[0069] 1) The constant current charge and discharge cur...

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Abstract

The invention discloses a nickel-cobalt-molybdenum ternary metal sulfide as well as a preparation method and application thereof. The preparation method of the nickel-cobalt-molybdenum ternary metal sulfide comprises the following steps: 1) adding a nickel chloride-cobalt chloride aqueous solution into an ethanol-aqueous solution of ammonium thiomolybdate, carrying out a coprecipitation reaction,separating out a solid product, purifying, and drying; 2) placing the product obtained in the step 1) in a protective atmosphere, and calcining; and 3) dispersing the product obtained in the step 2) in an ethanol-water solution of NaOH, carrying out a hydrothermal reaction, separating out a solid product, and purifying and drying the solid product. The nickel-cobalt-molybdenum ternary metal sulfide is controllable in morphology, good in conductivity and excellent in electrochemical performance, and the specific capacity and the energy density of a supercapacitor can be greatly improved when the nickel-cobalt-molybdenum ternary metal sulfide is used as an active material.

Description

technical field [0001] The invention relates to a nickel-cobalt-molybdenum ternary metal sulfide, a preparation method and application thereof. Background technique [0002] Supercapacitor is a new type of energy storage device. It not only has the characteristics of fast charging and discharging of capacitors, but also has the characteristics of energy storage of batteries. It is widely used in fields requiring high power consumption such as starting power supplies, electric vehicles, and industrial energy management systems. . Supercapacitors mainly include electric double layer capacitors (EDLCs) and pseudocapacitors. Electric double-layer capacitors mainly use porous carbon materials as active materials, which have low energy density and capacitance, and their applications are limited. Pseudocapacitors mainly use transition metal oxides, sulfides, and phosphides as active materials, and have higher capacitance than EDLCs. Ternary transition metal sulfides can combine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30C01G53/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G53/006C01P2002/72C01P2004/03C01P2004/32C01P2004/64C01P2006/40H01G11/30Y02E60/13
Inventor 陈胜洲马婷婷杨伟邹汉波陈江东冼智斌
Owner GUANGZHOU UNIVERSITY
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