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Nano thin sheet assembled nickel-iron hydroxide multistage microspheres and preparation method thereof

A technology of hydroxide and nano-flakes, applied in nickel compounds, chemical instruments and methods, nanotechnology, etc., can solve the problem of high charge density, and achieve the effects of simple operation, cheap raw materials, and low cost

Inactive Publication Date: 2015-11-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although various types of LDHs are prepared by the bottom-up method, ultrathin NiFe-LDHs nanosheets, especially those with single-layer or double-layer structure, are difficult to obtain because the charge density of NiFe-LDHs is significantly higher than that of other sheets. layer solid
Therefore, it remains a challenge to adopt a general method for the large-scale synthesis of single-layer or double-layer ultrathin NiFe-LDHs nanosheets.

Method used

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  • Nano thin sheet assembled nickel-iron hydroxide multistage microspheres and preparation method thereof
  • Nano thin sheet assembled nickel-iron hydroxide multistage microspheres and preparation method thereof
  • Nano thin sheet assembled nickel-iron hydroxide multistage microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] ①In a 100ml flask, add 0.8mmol of ferric nitrate, 2.4mmol of nickel nitrate, and 6.4mmol of urea into 40ml of water, stir vigorously for 10min, then add 15mg of trisodium citrate and 40ml of n-butanol. Continue strong magnetic stirring to prepare a reaction solution of layered double hydroxide NiFe-LDHs multi-level microspheres assembled by single-layer and double-layer nanosheets.

[0036] ② Transfer the reaction solution prepared according to step ① into a high-pressure reactor with a 100ml polytetrafluoroethylene liner. After reacting at 120°C for 12 hours, the reactor was naturally cooled to 20°C, washed several times with absolute ethanol, and vacuum After drying the sample, the layered double metal hydroxide NiFe-LDHs multi-level microspheres assembled by single-layer and double-layer nanosheets can be obtained.

[0037] The X-ray diffraction pattern of the obtained layered double metal hydroxide NiFe-LDHs multi-level microspheres assembled by single-layer nanoshe...

Embodiment 2

[0042] ①In a 100ml flask, add 0.8mmol of ferric nitrate, 2.4mmol of nickel nitrate, and 6.4mmol of sodium carbonate into 40ml of water, stir vigorously for 10min and then add 15mg of trisodium citrate and 40ml of n-butanol. At the same time, the strong magnetic stirring is continued to prepare the reaction solution of layered double hydroxide NiFe-LDHs nanosheets.

[0043] ② Transfer the reaction solution prepared according to step ① into a high-pressure reactor with a 100ml polytetrafluoroethylene liner. After reacting at 120°C for 12 hours, the reactor was naturally cooled to 20°C, washed several times with absolute ethanol, and vacuum Dry the sample to obtain layered double hydroxide NiFe-LDHs nanosheets.

[0044] Figure 6 is the X-ray diffraction pattern of the obtained layered double hydroxide NiFe-LDHs nanosheet, Figure 7 is the scanning electron micrograph of the obtained layered double hydroxide NiFe-LDHs nanosheets. It can be seen from the figure that the layered...

Embodiment 3

[0046] ①In a 100ml flask, add 0.8mmol of ferric nitrate, 2.4mmol of nickel nitrate, and 6.4mmol of sodium acetate into 40ml of water, stir vigorously for 10min, then add 15mg of trisodium citrate and 40ml of n-butanol. At the same time, the strong magnetic stirring is continued to prepare the reaction solution of layered double hydroxide NiFe-LDHs nanosheets.

[0047] ② Transfer the reaction solution prepared according to step ① into a high-pressure reactor with a 100ml polytetrafluoroethylene liner. After reacting at 120°C for 12 hours, the reactor was naturally cooled to 20°C, washed several times with absolute ethanol, and vacuum Dry the sample to obtain layered double hydroxide NiFe-LDHs nanosheets.

[0048] Figure 8 is the X-ray diffraction pattern of the obtained layered double hydroxide NiFe-LDHs nanosheet, Figure 9 Its scanning electron microscope photograph. It can be seen from the figure that the phase of the product of this example is a typical bimetallic compo...

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Abstract

The invention relates to nano thin sheet assembled nickel-iron hydroxide multistage microspheres and a preparation method thereof. With urea as an alkali source, with trisodium citrate as a complexing agent and with water and n-butyl alcohol as a reaction solvent, chemical solution mixed solvent heat is used for preparing the single or double layer nano sheet assembled layered double hydroxides NiFe-LDHs multistage microspheres. Firstly, a nickel salt, an iron salt, an alkali source and trisodium citrate are dissolved in the mixed solvent, and a reaction solution is prepared; and then the prepared reaction solution is treated under a solvothermal condition, and thus the regular-morphology single or double layer nano sheet assembled layered double hydroxides NiFe-LDHs multistage microspheres are obtained. Compared with the prior art, the method is simple, is low in cost, can synthesize the nickel-iron hydroxides multistage microspheres on large scale, and the nano sheet has the thickness of less than 2 nm.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a nickel-iron hydroxide multilevel microsphere assembled by nanosheets and a preparation method thereof. Background technique [0002] Layered double hydroxides (Layered double hydroxides abbreviated "LDHs") are a class of ionic layers composed of positively charged brucite-like layers and interlayers containing charge-compensating anions and solvated molecules. compound. Its chemical composition is: [M II 1-x m III x (OH) 2 ][A n- ] x / n ·zH 2 O, where M II Usually Mg 2+ ,Zn 2+ or Ni 2+ ; III is al 3+ , Ga 3+ ,Fe 3+ or Mn 3+ ;A n- It is an inorganic or organic anion that acts as charge compensation on the non-skeleton, such as: CO 3 2- , Cl - , SO 4 2- , RCO 2 - , x usually ranges from 0.2 to 0.4. LDHs have received extensive attention and are widely used in magnetism, catalysis, separation, adsorption, biosensors, energy stor...

Claims

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Application Information

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IPC IPC(8): C01G53/00B82Y30/00
Inventor 李晓敏宰建陶钱雪峰李波刘雪娇刘园园黄守双何青泉王敏
Owner SHANGHAI JIAO TONG UNIV
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