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Vanadium hydroxide nanosheet and preparation method thereof

A vanadium hydroxide nanometer, vanadium hydroxide technology, applied in chemical instruments and methods, nanotechnology, vanadium compounds, etc., can solve the problems of too small specific surface area, few active sites, and difficult to make film-like follow-up products. , to achieve the effect of scientific preparation method, high specific surface area and reasonable structure

Inactive Publication Date: 2018-10-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the phase of this product is vanadium hydroxide, there are deficiencies with its preparation method. At first, the appearance of the product is spherical, and it is difficult to make it into a film-like follow-up product; secondly, the size of the product is From submicron to micron level, too small specific surface area results in less active sites; finally, the preparation method cannot obtain products with higher specific surface area

Method used

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  • Vanadium hydroxide nanosheet and preparation method thereof
  • Vanadium hydroxide nanosheet and preparation method thereof
  • Vanadium hydroxide nanosheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The concrete steps of preparation are:

[0033] Step 1, first mix the three according to the molar ratio of vanadium pentoxide (or ammonium vanadate), ethylene glycol and deionized water in a ratio of 1:2:8 and then stir for 2 hours to obtain a mixed solution; The speed is 1200r / min. Then the mixed solution was placed at 180° C. for 120 h in a closed reaction to obtain a suspension-like reaction solution.

[0034] Step 2, the suspension reaction solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotation speed is 8000r / min, and the time is 6min, and the washing process is to use acetone and ethanol The separated solid matter is cleaned, the separation of the solid matter during cleaning is centrifugation, and the drying process is drying the cleaned solid matter at 50°C. The resulting shape is similar to figure 1 a and figure 2 shown, and the physical appearance as f...

Embodiment 2

[0036] The concrete steps of preparation are:

[0037] Step 1, first mix the three according to the molar ratio of vanadium pentoxide (or ammonium vanadate), ethylene glycol and deionized water as 1:2.75:7.25 and stir for 2.5h to obtain a mixed solution; wherein, when stirring The rotating speed is 1100r / min. Then the mixed solution was placed at 190° C. for 92 h in a closed reaction to obtain a suspension-like reaction solution.

[0038] Step 2, sequentially carry out solid-liquid separation, washing and drying treatment on the suspended reaction solution; wherein, the solid-liquid separation treatment is centrifugation, the rotation speed is 8500r / min, and the time is 5min, and the washing treatment is using acetone and ethanol The separated solid matter is cleaned, the separation of the solid matter during cleaning is centrifugation, and the drying process is drying the cleaned solid matter at 55°C. The resulting shape is similar to figure 1 a and figure 2 shown, and t...

Embodiment 3

[0040] The concrete steps of preparation are:

[0041] Step 1, first mix the three according to the molar ratio of vanadium pentoxide (or ammonium vanadate), ethylene glycol and deionized water in a ratio of 1:3.5:6.5 and then stir for 3 hours to obtain a mixed solution; The speed is 1000r / min. Then the mixed solution was placed at 200° C. for 64 h in a closed reaction to obtain a suspension-like reaction solution.

[0042] Step 2, the suspension reaction solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotation speed is 9000r / min, and the time is 4min, and the washing process is to use acetone and ethanol The separated solid matter is cleaned, the separation of the solid matter during cleaning is centrifugation, and the drying process is drying the cleaned solid matter at 60°C. made in the form of figure 1 a and figure 2 shown, and the physical appearance as figure 1 Van...

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Abstract

The invention discloses a vanadium hydroxide nanosheet and a preparation method thereof. The nanosheet is a vanadium hydroxide sheet having a thickness of 3 to 10 nm, a length of 200 to 500 nm and a width of 200 to 500 nm. The method comprises the steps: first mixing vanadium pentoxide or ammonium vanadate, ethylene glycol and deionized water, then stirring to obtain a mixed solution, reacting themixed solution in a closed state to obtain a turbid reaction liquid, then carrying out solid-liquid separation on the turbid reaction liquid, washing, and drying in turn to obtain the target product.The product has a reasonable structure and a high specific surface area, and is easy to widely use in the fields of sodium / lithium / magnesium ion batteries, supercapacitors and photocatalysis / electrocatalysis.

Description

technical field [0001] The invention relates to a nano-sheet and a preparation method thereof, in particular to a vanadium hydroxide nano-sheet and a preparation method thereof. Background technique [0002] Vanadium is a typical multivalent transition metal element, and its corresponding oxides can form various oxidation states and crystal structures. Due to the difference in phase and morphology, vanadium oxides exhibit corresponding singular physical and chemical properties. For example, the layered structure of vanadium pentoxide, vanadium tridetradecoxide, and metastable phase vanadium dioxide is very suitable for the insertion and extraction of Li+, and there are V-O bonds between layers, and when Li+ goes in and out of it, the lattice The change is small and the reversibility of the electrode is good, so it has been widely concerned and applied in lithium-ion batteries and supercapacitors; M-phase vanadium dioxide is a phase-change metal oxide, which is near the phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B82Y40/00
CPCB82Y40/00C01G31/00C01P2002/72C01P2004/03C01P2004/22
Inventor 李明罗媛媛许思超李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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