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Zinc-based MOF loaded vanadium dioxide nano material as well as preparation and application thereof

A vanadium dioxide, nanomaterial technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of unsatisfactory electrochemical performance, reduced zinc ion deintercalation speed, small specific surface area, etc. problems, to achieve the effect of improving capacity and rate performance, improving cycle stability, and increasing specific surface area

Pending Publication Date: 2022-03-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2) Most vanadium-based materials have poor conductivity and poor solubility in aqueous solution, which directly leads to capacity loss and unsatisfactory electrochemical performance
[0007] 3) The small specific surface area leads to a decrease in the rate of zinc ion deintercalation

Method used

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  • Zinc-based MOF loaded vanadium dioxide nano material as well as preparation and application thereof
  • Zinc-based MOF loaded vanadium dioxide nano material as well as preparation and application thereof
  • Zinc-based MOF loaded vanadium dioxide nano material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method of MOF-5 loaded vanadium dioxide nanomaterials, comprising the following steps:

[0050] Step 1: Dissolve 0.93g of terephthalic acid in the organic solvent N-N dimethylamide, sonicate until completely dissolved, and prepare A solution;

[0051] Step 2: Dissolve soluble zinc salt (zinc sulfate heptahydrate 2.22g) in organic solvent N-N dimethylamide, sonicate until completely dissolved, and prepare B solution;

[0052] Step 3: Mix A and B solutions, stir for 30 minutes, transfer to a stainless steel reactor with a polytetrafluoroethylene liner, and conduct a one-step hydrothermal reaction at 160°C for 12 hours;

[0053] Step 4: After the reaction process is completed, the solution is centrifuged, washed three times with water and ethanol, and dried at 80°C for 24 hours to obtain the MOF-5 material.

[0054] Step 5: Dissolve 1.8 g of soluble reducing agent (oxalic acid) in 25 mL of deionized water and stir evenly to obtain solution C.

[0055]Step 6...

Embodiment 2

[0059] A preparation method of MOF-5 loaded vanadium dioxide nanomaterials, comprising the following steps:

[0060] Step 1: Dissolve 0.93g of terephthalic acid in the organic solvent N-N dimethylamide, sonicate until completely dissolved, and prepare A solution;

[0061] Step 2: Dissolve soluble zinc salt (zinc sulfate heptahydrate 2.22g) in organic solvent N-N dimethylamide, sonicate until completely dissolved, and prepare B solution;

[0062] Step 3: Mix A and B solutions, stir for 30 minutes, transfer to a stainless steel reactor with a polytetrafluoroethylene liner, and conduct a one-step hydrothermal reaction at 160°C for 12 hours;

[0063] Step 4: After the reaction process is completed, the solution is centrifuged, washed three times with water and ethanol, and dried at 80°C for 24 hours to obtain the MOF-5 material.

[0064] Step 5: Dissolve 1.8 g of soluble reducing agent (oxalic acid) in 25 mL of deionized water and stir evenly to obtain solution C.

[0065] Step ...

Embodiment 3

[0069] A preparation method of MOF-5 loaded vanadium dioxide nanomaterials, comprising the following steps:

[0070] Step 1: Dissolve 0.93g of terephthalic acid in the organic solvent N-N dimethylamide, sonicate until completely dissolved, and prepare A solution;

[0071] Step 2: Dissolve soluble zinc salt (zinc sulfate heptahydrate 2.22g) in organic solvent N-N dimethylamide, sonicate until completely dissolved, and prepare B solution;

[0072] Step 3: Mix A and B solutions, stir for 30 minutes, transfer to a stainless steel reactor with a polytetrafluoroethylene liner, and conduct a one-step hydrothermal reaction at 160°C for 12 hours;

[0073] Step 4: After the reaction process is completed, the solution is centrifuged, washed three times with water and ethanol, and dried at 80°C for 24 hours to obtain the MOF-5 material.

[0074] Step 5: Dissolve 1.8 g of soluble reducing agent (oxalic acid) in 25 mL of deionized water and stir evenly to obtain solution C.

[0075] Step ...

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Abstract

The invention discloses a zinc-based MOF (Metal Organic Framework) loaded vanadium dioxide nano material as well as a preparation method and application thereof. According to the invention, a zinc-based MOF material is used as a carrier, and a vanadium dioxide nano material is loaded on the basis. According to the method, vanadium pentoxide is used as a vanadium source, a specific small-molecular organic matter is used as a reducing agent, and vanadium pentoxide is effectively reduced into vanadium dioxide; the MOF material has an extremely high specific surface area, and vanadium dioxide is loaded on the MOF material, so that the specific surface area of the electrode material in contact with an electrolyte can be increased, and more active sites are provided for embedding and deintercalation of zinc ions. An electrochemical result shows that the zinc-based MOF loaded vanadium dioxide nano material is used as a positive electrode, so that the zinc ion battery has good reversible specific capacity, the initial capacity can reach 299.3 mA hg <-1 > under the current density of 1A g <-1 >, and the capacity is kept at 141.4 mA hg <-1 > after 1000 cycles under the current density of 10A g <-1 >.

Description

technical field [0001] The invention relates to the technical field of battery materials, and more specifically, relates to a zinc-based MOF-loaded vanadium dioxide nanomaterial and a preparation method and application thereof. Background technique [0002] In recent years, great progress has been made in the development of new energy technologies, especially rechargeable batteries. At present, lithium-ion batteries are widely used in commercial energy storage devices due to their high energy transmission efficiency, high voltage, and long cycle life. However, many problems such as high cost and safety seriously hinder large-scale applications. Aqueous Zn-ion batteries have broad application prospects due to their high electrical conductivity, abundant zinc metal resources, high chemical and physical stability, environmental friendliness, and high safety, and are considered to be very promising alternatives in next-generation energy storage technologies. [0003] The perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M10/36B82Y30/00
CPCH01M4/62H01M4/48H01M10/36B82Y30/00H01M2004/028Y02E60/10
Inventor 何汉兵罗泽湘曾婧刘真
Owner CENT SOUTH UNIV
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