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Cobalt sulfide/g-C3N4 composite electrode material with two-dimensional hollow nano sheet structure and preparation method thereof

A composite electrode, g-c3n4 technology, applied in the field of supercapacitors and nanomaterials, can solve the problems of slow electrochemical reaction rate, poor cycle stability, poor conductivity, etc., and achieve good redox peaks, structural integrity, and improved conductivity. Effect

Active Publication Date: 2020-01-17
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its application is limited by the disadvantages of slow electrochemical reaction rate, poor electrical conductivity and poor cycle stability.

Method used

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  • Cobalt sulfide/g-C3N4 composite electrode material with two-dimensional hollow nano sheet structure and preparation method thereof
  • Cobalt sulfide/g-C3N4 composite electrode material with two-dimensional hollow nano sheet structure and preparation method thereof
  • Cobalt sulfide/g-C3N4 composite electrode material with two-dimensional hollow nano sheet structure and preparation method thereof

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preparation example Construction

[0027] The present invention provides cobalt sulfide / g-C with two-dimensional hollow nanosheet structure 3 N 4 The preparation method of composite electrode material comprises the following steps:

[0028] (1) One or more of melamine, thiourea, and urea are placed in a tube furnace and calcined under a nitrogen atmosphere to obtain g-C 3 N 4 ;

[0029] (2) put g-C 3 N 4 mixed with a solvent for ultrasonic dispersion, and then added C 4 h 6 N 2 Continue ultrasonic dispersion to obtain a uniform solution;

[0030] (3) mixing the cobalt salt with a solvent to obtain a uniform solution;

[0031] (4) Mix the two homogeneous solutions obtained in the steps (2), (3), stir, let stand for a period of time, centrifuge, wash, and dry to obtain the cobalt sulfide / g-C of the two-dimensional hollow nanosheet structure 3 N 4 Precursors of composite electrode materials;

[0032] (5) Put the precursor obtained in the step (4) into a solution containing a sulfur source, perform a hy...

Embodiment 1

[0041] Take 7 g of melamine and place it in a tube furnace under nitrogen atmosphere at 10 °C min -1 The heating rate was increased to 600 ° C for 2 h to obtain g-C 3 N 4 . Take 10mg g-C 3 N 4 Sonicate in 40ml water for 1h, add 1.31g C 4 h 6 N 2 Continue ultrasonic treatment for 1h, take 0.58g Co(NO 3 ) 2 ·6H 2 O is dissolved in 40ml of water; the above two solutions are mixed, wherein cobalt salt, C 4 h 6 N 2 , The mass ratio of water is: 1:2.26:138. At a stirring speed of 450rpm, stir for 5min, stand at 25°C for 4h, then centrifuge at 7000rpm for 4min, wash with deionized water and absolute ethanol three times, and dry the obtained product in a drying oven at 60°C 24h, the precursor of the composite electrode material was obtained, and its scanning electron microscope picture is as follows figure 1 as shown in a.

[0042] Add the precursor obtained in the above steps to an ethanol solution containing 3g / L thioacetamide, add the reaction solution to the lining ...

Embodiment 2

[0045] Take 7 g of melamine and place it in a tube furnace under nitrogen atmosphere at 10 °C min -1 The heating rate was increased to 500 ° C for 4 h to obtain g-C 3 N 4 . Take 20mg g-C 3 N 4 Ultrasonic dispersion in 40mL of methanol for 0.5h, take 1.31g C 4 h 6 N 2 Add to the above solution and continue to sonicate for 1h, and dissolve another 0.35g of cobalt acetate in 40mL of methanol; mix the above two solutions, in which cobalt salt, C 4 h 6 N 2 , The mass ratio of solvent is: 1: 3.7: 180.6. At a stirring speed of 250rpm, stir for 30min, stand at 25°C for 24h, centrifuge at 8000rpm for 5min, wash with deionized water and methanol three times respectively, and dry the obtained product in a drying oven at 60°C for 24h to obtain a composite electrode material precursors.

[0046] Add the precursor obtained in the above steps to an ethanol solution containing 4g / L sodium sulfide, add the reaction solution to the lining of a polytetrafluoroethylene reactor, place i...

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Abstract

The invention provides a cobalt sulfide / g-C3N4 composite electrode material with a two-dimensional hollow nano-sheet structure and a preparation method thereof. The invention provides the preparationmethod of the cobalt sulfide / g-C3N4 with the two-dimensional hollow nano-sheet structure. Specifically, g-C3N4 is added into a reaction solution containing a cobalt salt, C4H6N2 and a solvent, cobaltions react with C4H6N2 to form a two-dimensional nano-sheet precursor in situ on the g-C3N4, then a sulfur source is added, and the cobalt sulfide / g-C3N4 composite electrode material with the two-dimensional hollow nano-sheet structure is obtained through hydrothermal reaction. The preparation process of the material is simple, the cost is low, and no pollution is caused. The composite electrode material can increase the contact area between an electrolyte solution and an electrode material, shorten the ion transmission path, accelerate the ion transmission rate and increase the conductivity.As the electrode material of a supercapacitor, the material has excellent specific capacitance and cycle stability.

Description

technical field [0001] The invention relates to the technical field of supercapacitors and nanomaterials, in particular to a cobalt sulfide / g-C with a two-dimensional hollow nanosheet structure 3 N 4 Composite electrode material and its preparation method. Background technique [0002] Electrochemical supercapacitors are a power source between traditional capacitors and batteries. According to the different energy storage mechanism, it can be divided into two types: electric double layer capacitor and faraday pseudo capacitor. It has excellent characteristics such as short charging time, high power density, good cycle stability, long service life, environmental protection and pollution-free, so it has been widely used in communication, electronic products, new energy vehicles and other fields. As an energy storage device, a supercapacitor is a green technology that combines energy and environmental protection. When applied, it can not only provide continuous energy, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01B21/082H01G11/24H01G11/30
CPCC01G51/30C01B21/0605H01G11/24H01G11/30C01P2004/20C01P2004/62C01P2004/80C01P2006/40Y02E60/13
Inventor 陶凯李伟伟韩磊
Owner NINGBO UNIV
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