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A kind of cobalt selenide/nitrogen-doped carbon composite material and its preparation method and application

A nitrogen-doped carbon, composite material technology, applied in nanotechnology for materials and surface science, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, etc., can solve problems such as reduced stability and achieve excellent electrical conductivity , good repeatability, simple operation effect

Inactive Publication Date: 2018-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activity of nanoparticles is high, but at the same time the stability is reduced

Method used

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  • A kind of cobalt selenide/nitrogen-doped carbon composite material and its preparation method and application
  • A kind of cobalt selenide/nitrogen-doped carbon composite material and its preparation method and application
  • A kind of cobalt selenide/nitrogen-doped carbon composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Double-shell cobalt selenide (CoSe 2 ) / Nitrogen-doped carbon composites

[0032] The cobalt nitrate hexahydrate of 4mmol is joined in the 200mL methanol that contains 20mmol dimethylimidazole, after mixing uniformly, leave standstill for 24 hours; The precipitate ZIF-67 obtained is centrifuged and dried, and the dry product and selenium powder are mixed at 1: The mass ratio of 1 is mixed; the resulting mixture is calcined at a temperature of 600 degrees Celsius for 4 hours under an argon atmosphere to obtain cobalt selenide (CoSe) with a double-shell structure. 2 ) / nitrogen-doped carbon composites.

[0033] The phase of the product was characterized by Rigaku D / max 2500 X-ray diffractometer, the elements contained in the product were analyzed by ESCALAB 250Xi X-ray photoelectron spectrometer from Thermo Fisher Scientific, and the product was analyzed by Nova NanoSEM230 scanning electron microscope. The morphology was characterized, and the internal structure of the pr...

Embodiment 2

[0040] Cobalt selenide (CoSe 2 ) / Nitrogen-doped carbon composites

[0041] Add 4mmol of cobalt nitrate hexahydrate to 200mL of methanol containing 20mmol of dimethylimidazole, mix well and let stand for 24 hours; centrifuge and dry the resulting precipitate, and dry the product and selenium powder at a mass ratio of 1:1 than mixing; the resulting mixture was calcined at a temperature of 300 degrees Celsius for 4 hours under an argon atmosphere to obtain cobalt selenide (CoSe 2 ) / nitrogen-doped carbon composites.

Embodiment 3

[0043] Preparation of Large Size Cobalt Selenide (CoSe) / Nitrogen Doped Carbon Composite

[0044] Add 1 mmol of cobalt nitrate hexahydrate to 100 mL of methanol containing 5 mmol of dimethylimidazole, mix well and let stand for 24 hours; centrifuge and dry the obtained precipitate, and mix the dried product and selenium powder at a mass ratio of 1:1 ratio mixing; the resulting mixture was calcined at a temperature of 600 degrees Celsius for 4 hours under an argon atmosphere to obtain a cobalt selenide (CoSe) / nitrogen-doped carbon composite material.

[0045] The phase of the product was characterized by Rigaku D / max 2500 X-ray diffractometer, and the morphology of the product was characterized by NovaNanoSEM230 scanning electron microscope.

[0046] Image 6 Be the X-ray powder diffraction figure of the product of embodiment 3, the result shows that product is a cobalt selenide phase;

[0047] Figure 7 It is the SEM picture of the product of Example 3, it can be seen that the...

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Abstract

The invention provides a cobalt selenide / nitrogen-doped carbon composite material and a preparation method and an application therefor, and belongs to the technical fields of nanomaterial preparation and application. An organic metallic framework ZIF-67 is taken as a template for preparing the cobalt selenide / nitrogen-doped carbon composite material; the material adopts a rhombic dodecahedron shape with controllable sizes; and cobalt selenide is cobalt selenide or cobalt diselenide nanoparticles uniformly dispersed on a nitrogen-doped carbon framework. The compound has a good mesoporous structure and excellent conductivity; and when the composite material is used as the electrode material for a supercapacitor, a high specific capacitance and high stability are achieved.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation and application, in particular to a cobalt selenide / nitrogen-doped carbon composite material and its preparation method and application. Background technique [0002] With the rapid growth of the world economy, the continuous consumption of coal and oil resources, and the increasingly serious environmental pollution, the demand for efficient, clean and sustainable energy has become more and more urgent. At the same time, the technical requirements for energy storage and conversion are getting higher and higher. Due to the characteristics of high power density, long cycle life, and no pollution to the environment, supercapacitors have good application prospects in the field of energy storage and conversion. The electrode material of a supercapacitor is one of the key factors determining its performance. A good electrode material needs to have the characteristics of high electroch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/30H01G11/86B82Y30/00B82Y40/00
CPCY02E60/13
Inventor 梁叔全张伊放潘安强王亚平呼继梅唐艳
Owner CENT SOUTH UNIV
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