Preparation method and application of transition metal double hydroxide nano-film and carbon nanotube composite material

A double hydroxide and transition metal technology, applied in the field of electrocatalysis, can solve the problems of incapable mass production and difficulty in obtaining few-layer LDHs, and achieve the effects of convenient operation, guaranteed shape control, and low preparation cost

Active Publication Date: 2020-12-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrodeposition operation is relatively simple, without heating and pressure, the experimental conditions are simple, and the production cycle is short. However, it is difficult to obtain few-layer LDHs by the electrodeposition method, and it cannot be mass-produced.

Method used

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  • Preparation method and application of transition metal double hydroxide nano-film and carbon nanotube composite material
  • Preparation method and application of transition metal double hydroxide nano-film and carbon nanotube composite material
  • Preparation method and application of transition metal double hydroxide nano-film and carbon nanotube composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 3.49g of cobalt nitrate and 0.63g of vanadium chloride and dissolve them in 50mL of deionized water saturated with oxygen, stir and dissolve in an oxygen protective atmosphere, and the flow rate of oxygen gas is 70mL / min to form a transparent solution.

[0039] (2) Add 0.1 g of carbon nanotubes into the above transparent solution, and continue to stir for 30 minutes under the condition of aeration of oxygen to obtain a uniform suspension.

[0040] (3) 25 mL of sodium hydroxide with a concentration of 2 mol / L was quickly added to the above suspension, the oxygen flow rate was increased to 80 mL / min, the stirring speed was 500 r / min, and the time was 30 min to obtain a brown precipitate.

[0041] (4) The above-mentioned brown precipitate was successively washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 30° C. for 15 hours to obtain a composite material of nano-film cobalt vanadium double hydroxide and carbon nanotubes.

...

Embodiment 2

[0047] (1) Weigh 3.49g of cobalt nitrate and 0.74g of manganese acetate and dissolve them in 50mL of deionized water saturated with oxygen, stir and dissolve in an oxygen protective atmosphere, and the flow rate of oxygen gas is 70mL / min to form a transparent solution.

[0048] (2) Add 0.08 g of carbon nanotubes into the above solution, and continue stirring for 30 minutes under the condition of aeration of oxygen.

[0049] (3) Quickly add 20 mL of sodium hydroxide with a concentration of 2 mol / L to the above mixed suspension, increase the oxygen flow rate to 80 mL / min, stir at 500 r / min for 1.5 h, and obtain a dark brown precipitate.

[0050] (4) The above-mentioned brown precipitate was washed three times by deionized water and absolute ethanol respectively, and dried in a vacuum oven at 30° C. for 15 hours to obtain a composite material of nano-film cobalt-manganese double hydroxide and carbon nanotubes. Looks like figure 2 and 7 shown.

[0051] figure 2 For the X-ray...

Embodiment 3

[0055] (1) Weigh 3.49g of cobalt nitrate and 0.87g of nickel nitrate and dissolve in 50mL of deionized water saturated with oxygen, stir and dissolve in an oxygen protective atmosphere, and the flow rate of oxygen gas is 70mL / min to form a transparent solution.

[0056] (2) Add 0.2 g of carbon nanotubes into the above solution, and continue stirring for 60 minutes under the condition of aeration of oxygen.

[0057] (3) Quickly add 20 mL of sodium hydroxide with a concentration of 2 mol / L to the above mixed suspension, increase the oxygen flow rate to 100 mL / min, stir at 600 r / min, and 0.5 h to obtain a dark green precipitate.

[0058] (4) The above-mentioned dark green precipitate was washed three times with deionized water and absolute ethanol successively, and dried in a vacuum oven at 35°C for 20h to obtain a composite material of nano-film cobalt-nickel double hydroxide and carbon nanotubes. looks like image 3 and 8 shown.

[0059] image 3 For the X-ray diffraction s...

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Abstract

The invention discloses a preparation method and application of a transition metal double hydroxide nano-film and a carbon nano-tube composite material. The preparation method comprises the followingsteps: weighing a metal salt, dissolving the metal salt in saturated oxygen deionized water, uniformly stirring in an oxygen atmosphere, adding carbon nano-tubes, continuously stirring and uniformly dispersing, adding an alkaline solution, increasing the oxygen gas flow, and stirring to obtain a precipitate, centrifugally cleaning the precipitate with deionized water and absolute ethyl alcohol, and drying the precipitate with a vacuum oven to obtain the nano-scale powder material. The preparation method is simple, simple and convenient to operate and low in cost, and has a good industrial application prospect.

Description

technical field [0001] The present invention relates to a preparation method and application of nano catalytic materials in the field of electrocatalysis, in particular to a preparation method and application of transition metal double hydroxide nano film and carbon nanotube composite material, the prepared transition metal double hydroxide Composite materials with carbon nanotubes have good electrochemical oxygen evolution performance. Background technique [0002] Layered double hydroxides (LDHs for short) have good application prospects in the fields of energy conversion and energy storage such as electrocatalysis, secondary batteries, and supercapacitors. Its crystal structure is layered, with the lowest lattice energy and lattice positioning effect. It is composed of metal element hydroxides. The main layer is metal cations, and the transition layer is hydroxide ions. It is easy to adsorb other anions, and the composition is easy to adjust. At the same time It can be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/847B01J23/889B01J35/02C25B1/04C25B11/06H01M4/90
CPCB01J23/755B01J23/8472B01J23/8892B01J35/0033B01J35/023C25B1/04H01M4/9016H01M4/9083Y02E60/36Y02E60/50
Inventor 邓意达赵君王杨胡文彬张金凤韩晓鹏钟澄邱留喆
Owner TIANJIN UNIV
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