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Method for synthesizing iron-containing hydrotalcite-like compound by utilizing prussian blue as raw material

A technology of Prussian blue and hydrotalcite, which is applied in the field of inorganic nanomaterial preparation, can solve the problems such as the inability to meet the practical application requirements of supercapacitors, the limited improvement of single-component nano/microstructure performance, etc., and achieve good reversible discharge capacity and large application. Potential, electrochemical performance improvement effect

Active Publication Date: 2014-07-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance improvement of single-component nano / microstructures is limited, which is far from meeting the practical application requirements of supercapacitors.

Method used

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  • Method for synthesizing iron-containing hydrotalcite-like compound by utilizing prussian blue as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A: Weigh 2g of Prussian blue powder, weigh 1.04g of formic acid according to the molar ratio of Prussian blue to formic acid is 1:3, dissolve the two in 100mL deionized water, stir and ultrasonicate for 30min to form a stable and uniform blue solution; Weigh 0.5gCo(NO 3 ) 2 ·6H 2 O was dissolved in the above blue solution, stirred and sonicated until dissolved;

[0017] B: Weigh NaOH and Na 2 CO 3 Dissolved in deionized water to form a mixed alkali solution, where n(NaOH) / [n(Co 2+ )+0.25n(Prussian blue)]=2.2, n(Na 2 CO 3 ) / [0.25n(Prussian blue)]=2.5, NaOH concentration is 1.5mol / L, n(NaOH), n(Co 2+ ), n (Prussian blue), n (NaCO 3 ) are the moles of sodium hydroxide, cobalt ions, Prussian blue, and sodium carbonate respectively, and the alkali solution is slowly added dropwise to the solution prepared in step A until the pH=9.5, then stirred and reacted at 80°C for 24 hours, and centrifuged and washed until the pH The value is 7, and then dried at 80°C for 40 ho...

Embodiment 2

[0019] A: Weigh 1.5g of Prussian blue powder, weigh 0.780g of oxalic acid according to the molar ratio of Prussian blue to oxalic acid is 1:5, dissolve the two in 100mL deionized water, stir and sonicate for 30min to form a stable and uniform blue solution , weighed 0.375gCo(NO 3 ) 2 ·6H 2 O was dissolved in the above blue solution, stirred and sonicated until dissolved;

[0020] B: Weigh NaOH and Na 2 CO 3 Dissolved in deionized water to form a mixed alkali solution, n(NaOH) / [n(Co 2+ )+0.25n(Prussian blue)]=3.0, n(Na 2 CO 3 ) / [0.25n(Prussian blue)]=2.5, NaOH concentration is 3.5mol / L, n(NaOH), n(Co 2+ ), n (Prussian blue), n (NaCO 3 ) are the moles of sodium hydroxide, cobalt ions, Prussian blue, and sodium carbonate respectively, and the alkali solution is slowly added dropwise to the solution prepared in step A until pH = 9, then stirred and reacted at 85°C for 24h, and centrifuged and washed until the pH The value is 8, and then dried at 140°C for 8 hours to obtai...

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Abstract

The invention discloses a method for preparing iron-containing hydrotalcite-like compound by utilizing prussian blue pigment and divalent metal salt, and belongs to the technical field of preparation processes of inorganic nanometer materials. The method comprises the following steps of selecting the prussian blue as a raw material, mixing and dissolving with organic acid according to the constant proportion, and carrying out a coprecipitation reaction on divalent metal ions under an alkaline environment by utilizing Fe<3+> ions released by the prussian blue in the solution to prepare Fe<3+>-containing hydrotalcite-like compound, wherein grain size of the prepared Fe<3+>-containing hydrotalcite-like compound is uniformly dispersed in a nanometer level. According to the method disclosed by the invention, the prepared iron-containing hydrotalcite-like compound has the electrochemical property of the prussian blue, also has the electrochemical activity of the hydrotalcite-like compound, and has remarkably improved electrochemical property compared with the single-element hydrotalcite; and when the prepared iron-containing hydrotalcite-like compound is taken as a capacitor material, the cycle performance of the iron-containing hydrotalcite-like compound is subjected to a charge-discharge test, so that the iron-containing hydrotalcite-like compound has excellent reversible discharge capacity and stable cycle performance, and has large application potentiality in the electrochemical field.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a method for preparing iron-containing hydrotalcites by using a pigment Prussian blue and a divalent transition metal salt. Background technique [0002] Hydrotalcite-like (LDHs), also known as layered composite metal hydroxides, is an anionic clay whose general chemical formula is [M II 1-x m III x (OH) 2 ] x+ (A n- ) x / n ·yH 2 O, where M II and M III They are divalent and trivalent metal cations respectively, located on the main laminate; A n– is an interlayer anion; x is M III / (M II +M III ) molar ratio; y is the number of interlayer water molecules. Due to the layered structure of LDHs, the layer elements are tunable and the interlayer anions are exchangeable. This special property shown in the chemical structure not only makes it have ion exchange properties, but also has a wide range of applications in the fie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
Inventor 徐赛龙鲁晓伟霍瑞洁张法智
Owner BEIJING UNIV OF CHEM TECH
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