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Method for quickly preparing cobalt sulfide/graphene hydrogel nano composite material

A technology of graphene hydrogel and nanocomposite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing the effective specific surface area of ​​the composite, reducing the electrochemical performance, and experimental operation Complicated problems, to achieve excellent electrochemical performance, convenient testing, simple operation

Inactive Publication Date: 2015-12-16
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned preparation method has the following defects: 1. The experimental operation is relatively complicated and the experimental conditions are relatively harsh; 2. Nano-cobalt sulfide particles and graphene sheets are prone to agglomeration and stacking during drying and heat treatment, which reduces the effective specific surface area of ​​the composite , thereby reducing its electrochemical performance

Method used

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  • Method for quickly preparing cobalt sulfide/graphene hydrogel nano composite material
  • Method for quickly preparing cobalt sulfide/graphene hydrogel nano composite material
  • Method for quickly preparing cobalt sulfide/graphene hydrogel nano composite material

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Experimental program
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Effect test

Embodiment 1

[0027] Step 1: Dissolve 106mg graphene oxide in 15mL isopropanol, stir to fully disperse (60min);

[0028] Step 2: 2.14gCoCl 2 ·6H 2 O with 2.14gNa 2 S·9H 2 O was dissolved in 7.5 mL of water respectively to obtain CoCl 2 Aqueous solution and Na 2 S aqueous solution;

[0029] Step three: the graphene oxide alcohol solution obtained in step one, the CoCl obtained in step two 2 Aqueous solution, Na 2 The S aqueous solution was placed in the container in turn to obtain the reaction solution, and then placed in a closed reaction kettle for constant temperature reaction at 220 ° C for 18 hours;

[0030] Step 4: After washing the product obtained in Step 3, the cobalt sulfide / graphene hydrogel nanocomposite material is obtained.

[0031] The resulting product and its freeze-dried photos are attached figure 2 It is shown that the product has a three-dimensional hydrogel structure. The freeze-dried samples were made into electrodes for electrochemical testing. The cyclic vo...

Embodiment 2

[0033] Step 1: Dissolve 53mg graphene oxide in 10.5mL isopropanol, stir to fully disperse (60min);

[0034] Step 2: 1.07gCoCl 2 ·6H 2 O with 1.07gNa 2 S·9H 2 O was dissolved in 5.25mL water respectively;

[0035] Step three: the graphene oxide alcohol solution obtained in step one, the CoCl obtained in step two 2 Aqueous solution, Na 2 The S aqueous solution was placed in the container in turn to obtain the reaction solution, and then placed in a closed reaction kettle for constant temperature reaction at 200 ° C for 18 hours;

[0036] Step 4: After washing the product obtained in Step 3, the cobalt sulfide / graphene hydrogel nanocomposite material is obtained.

[0037] Calculated by the constant current charge and discharge curve, the specific capacitance of the product obtained in this embodiment is 394.0 F / g.

Embodiment 3

[0039] Step 1: Dissolve 106mg graphene oxide in 7.5mL isopropanol, stir to fully disperse (45min);

[0040] Step 2: 428mgCoCl 2 ·6H 2 O with 428mgNa 2 S·9H 2 O was dissolved in 11.25mL water respectively;

[0041] Step three: the graphene oxide alcohol solution obtained in step one, the CoCl obtained in step two 2 Aqueous solution, Na 2 The aqueous solution of S was placed in the container in turn to obtain the reaction liquid, and then placed in a closed reaction kettle for constant temperature reaction at 180°C for 12 hours;

[0042] Step 4: After washing the product obtained in Step 3, the cobalt sulfide / graphene hydrogel nanocomposite material is obtained.

[0043] Calculated by the constant current charge and discharge curve, the specific capacitance of the product obtained in this embodiment is 298.8 F / g.

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Abstract

The invention discloses a method for quickly preparing a cobalt sulfide / graphene hydrogel nano composite material, which comprises the steps of stirring and dispersing graphene oxide into an isopropyl alcohol solution so as to obtain a dispersion liquid; sequentially placing the dispersion liquid, a CoCl2 aqueous solution and a Na2S aqueous solution into a container to acquire a reaction liquid, placing the reaction liquid into a closed reactor, and carrying out constant temperature reaction at a temperature of 100-220 DEG C; and washing an obtained product so as to acquire the composite material. The preparation method disclosed by the invention is simple and convenient to test, and does not need addition of any binder; and advantages of graphene and cobalt sulfide are well combined, a synergistic effect of the graphene and the cobalt sulfide is utilized, and a large specific surface area of the graphene is inherited, thereby effectively suppressing phenomena of stacking of graphene sheet layers and gathering of cobalt sulfide nano particles, and further improving the electrochemical performance of the material.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing a cobalt sulfide / graphene hydrogel nanocomposite material by utilizing the characteristics of graphene hydrogel. Background technique [0002] As an important transition metal sulfide, cobalt sulfide has the advantages of low price, environmental friendliness, abundant resources and excellent physical, chemical, electrical and optical properties. Due to the polymorphism of morphology and the richness of crystal structure, it is often used in supercapacitors, lithium batteries, catalysis, biosensors, solar cells and other fields. However, the poor cycle stability and power characteristics of cobalt sulfide largely limit its further application. Therefore, we need to combine cobalt sulfide with other materials to overcome the above defects and improve material performance. [0003] In recent years, the development and application of graphene mat...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/24B82Y30/00
Inventor 朱俊武孙欢汪信付永胜丁静孟晓茜
Owner NANJING UNIV OF SCI & TECH
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