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A transition metal chalcogenide carbon-based heterostructure composite material with regular morphology and its preparation method and application

A transition metal and heterostructure technology, which is applied in the preparation/purification of carbon, structural parts, chemical instruments and methods, etc., can solve the complex preparation process, poor controllability, irregular morphology of transition metal chalcogenides, etc. problem, to achieve the effect of simple and fast method and controllable conditions

Active Publication Date: 2021-06-11
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 purpose of the present invention is to provide a transition metal chalcogenide carbon-based heterostructure composite material with regular morphology, uniform multi-level carbon coating, and stable structure, which solves the problems existing in similar composite materials

Method used

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  • A transition metal chalcogenide carbon-based heterostructure composite material with regular morphology and its preparation method and application
  • A transition metal chalcogenide carbon-based heterostructure composite material with regular morphology and its preparation method and application
  • A transition metal chalcogenide carbon-based heterostructure composite material with regular morphology and its preparation method and application

Examples

Experimental program
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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 chalcogenide carbon-based heterostructure composite material with regular morphology and its preparation method and application. Raw materials including transition metal acetylacetonate and chalcogen compounds are placed under protection Calcined under the atmosphere, the transition metal chalcogenide carbon-based heterostructure composite material with regular shape, uniform multi-level carbon coating and stable structure can be obtained, which can be applied to the preparation of energy storage devices, showing excellent electrochemical performance. In particular, the rate and cycle stability of energy storage devices have obvious advantages compared with existing materials.

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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Patent Type & Authority Patents(China)
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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