Transition metal chalcogen-group carbon-based heterostructure composite material with regular morphology and preparation method and application of transition metal chalcogen-group carbon-based heterostructure composite material

A transition metal, heterostructure technology, applied in the preparation/purification of carbon, structural parts, chemical instruments and methods, etc., can solve the irregular morphology of transition metal chalcogenide compounds, unstable interface structure, carbon-based composite Non-uniformity and other problems, to achieve the effect of accelerating the progress of the electrochemical reaction, improving the rate performance, and increasing the active sites of the reaction

Active Publication Date: 2020-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of irregular morphology, uneven carbon-based compounding, poor controllability, complicated preparation process and unstable interface structure of transition metal chalcogenide compounds prepared in the prior art
[0006] The second purp...

Method used

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  • Transition metal chalcogen-group carbon-based heterostructure composite material with regular morphology and preparation method and application of transition metal chalcogen-group carbon-based heterostructure composite material
  • Transition metal chalcogen-group carbon-based heterostructure composite material with regular morphology and preparation method and application of transition metal chalcogen-group carbon-based heterostructure composite material
  • Transition metal chalcogen-group carbon-based heterostructure composite material with regular morphology and preparation method and application of transition metal chalcogen-group carbon-based heterostructure composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Mix 1.0 g of commercial cobalt acetylacetonate with 2.0 g of selenium powder and 3.0 g of sodium sulfate, and then calcinate it at 500 ° C for 2 h under the protection of inert gas argon, with a heating rate of 3 ° C min -1 , natural cooling. Grind the calcined black product into powder, add an appropriate amount of water, perform ultrasonication for 30 minutes, magnetically stir for 3 hours, and then perform suction filtration. After repeated operations for 5 times, dry it in vacuum at 80°C for 12 hours to obtain a black powder That is, nanodot-like cobalt diselenide carbon-based heterostructure (CoSe 2 / C). figure 1 Based on the scanning electron microscope picture of the nano-dot-like cobalt diselenide carbon-based heterostructure, it can be observed that the carbon matrix is ​​completely covered with the cobalt diselenide material. figure 2 The worthwhile nano-dot-like cobalt diselenide carbon-based heterostructure transmission electron microscope pictures, it ca...

Embodiment 2

[0046] Mix 1.0g of commercial cobalt acetylacetonate, 2.0g of selenium powder and 3.0g of sodium sulfate evenly, and then calcinate it at 500°C for 2h under the protection of reducing gas 5% hydrogen-argon mixed gas, and the heating rate is 3°C min -1 , natural cooling. Grind the calcined black product into powder, add an appropriate amount of water, perform ultrasonication for 30 minutes, magnetically stir for 3 hours, and then perform suction filtration. After repeated operations for 5 times, dry it in vacuum at 80°C for 12 hours to obtain a black powder Nano-microsphere cobalt diselenide nanotube carbon-based heterostructure (CoSe 2 / C). Figure 4 It is a scanning electron microscope picture of the carbon-based heterogeneous structure of the nano-microsphere cobalt diselenide nanotube, and the particles wrapped by the carbon nanotube can be seen. Electrochemical test results show that at 5.0A g -1 Under the current density, after 5000 cycles, the sodium capacitance can ...

Embodiment 3

[0050] Mix 1.0g of commercial cobalt acetylacetonate, 2.0g of selenium powder and 3.0g of sodium sulfate evenly, and then calcinate it at 800°C for 5h under the protection of reducing gas 5% hydrogen-argon mixed gas, and the heating rate is 10°C min -1 , natural cooling. Grind the calcined black product into powder, add an appropriate amount of water, perform ultrasonication for 30 minutes, magnetically stir for 3 hours, and then perform suction filtration. After repeated operations for 5 times, dry it in vacuum at 80°C for 12 hours to obtain a black powder That is grape microspherical cobalt selenide carbon-based heterostructure (CoSe / C). Figure 5 This is the scanning electron microscope picture of the grape microspherical cobalt selenide carbon-based heterostructure, and the nanoparticles wrapped by the carbon matrix can be seen. Electrochemical test results show that at 5.0A g -1 Under the current density, after 8000 cycles, the sodium capacitance can maintain 297mAh g ...

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Abstract

The invention discloses a transition metal chalcogen-group carbon-based heterostructure composite material with a regular morphology and a preparation method and application of the transition metal chalcogen-group carbon-based heterostructure composite material. The preparation method comprises the following step: calcining starting materials including transition metal acetylacetonates and chalcogenides under a protective atmosphere to obtain the transition metal chalcogen-group carbon-based heterostructure composite material with the regular morphology, uniform multi-stage carbon coating andstable structure. When applied to preparation of an energy storage device, the transition metal chalcogen-group carbon-based heterostructure composite material with the regular morphology has excellent electrochemical performance. Particularly, compared with an existing material, the transition metal chalcogen-group carbon-based heterostructure composite material with the regular morphology has obvious advantages on the multiplying power and cycle stability of an energy storage device.

Description

technical field [0001] The present invention relates to a high-efficiency energy storage material, in particular to a transition metal chalcogenide carbon-based heterostructure composite material with regular morphology, and also relates to the preparation of high-efficiency energy storage materials by one-step high-temperature calcination of transition metal acetylacetonate and chalcogen The method for new energy storage materials also relates to the application of composite materials in energy storage devices, and belongs to the technical field of new materials for energy storage devices. Background technique [0002] Transition metal chalcogenides, referred to as TMDCs, commonly used MX z Indicates (M=Fe, Co, Ni, etc., X=S, Se, Te, Z=1-2). Due to its high energy density, narrow energy band gap, and abundant sources, it has become a hot material in the fields of photocatalysis and solar cells. Recently, TMDCs are considered to be one of the most promising electrode mater...

Claims

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Application Information

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IPC IPC(8): C01B19/04C01B32/05C01B32/15C01B32/16C01G9/08C01G29/00C01G30/00C01G39/06C01G41/00C01G45/00H01G11/30H01M4/58H01M4/62
CPCC01B19/007C01G9/08C01G29/00C01G30/008C01G39/06C01G41/00C01G45/00C01P2004/16C01P2004/20C01P2004/30C01P2004/80C01P2006/40C01B32/05C01B32/15C01B32/16H01G11/30H01M4/581H01M4/625Y02E60/10
Inventor 葛鹏孙伟胡岳华张丽敏
Owner CENT SOUTH UNIV
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