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Preparation method of cobaltates nanowire array with spinel structure

A spinel structure and nanowire array technology, which is applied in the field of preparation of cobaltate nanowire arrays, can solve the problem of uneven distribution of multi-element metal oxide composition, low filling rate of oxide precursors, and difficulty in phase purity, etc. problems, to achieve the effect of uniform pore size, controllable structure and high crystallinity

Inactive Publication Date: 2009-12-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the composition distribution of multiple metal oxides is not uniform and the filling rate of oxide precursors is not high
Therefore, it is difficult to obtain cobaltate nanowire arrays with high phase purity, large specific surface area, mesoscopic order and spinel structure.

Method used

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  • Preparation method of cobaltates nanowire array with spinel structure
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  • Preparation method of cobaltates nanowire array with spinel structure

Examples

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Embodiment 1

[0026] Synthesis of copper cobaltate nanowire arrays with spinel structure: firstly, copper nitrate trihydrate (Cu(NO) 2 ·3H 2 O) and cobalt nitrate hexahydrate (Co(NO) 2 ·6H 2 O) Formulated with a molar ratio of 1:2 (Cu / Co) to a concentration of about 1g ml -1 Aqueous solution. Disperse 0.5g of the calcined mesoporous silica SBA-15 uniformly in 20ml of n-hexane, stir at room temperature for 3 hours, then take 0.5ml of the prepared metal nitrate aqueous solution and add it dropwise with vigorous stirring; stir; Volatilize the solvent for 12-24 hours to obtain a dry powder; place the composite material in a muffle furnace and calcinate at 380°C for 4-6 hours to decompose the metal nitrate to produce copper cobaltate (CuCo) with a spinel structure. 2 O 4 ); Finally, the silica template was removed with 20ml of 2M sodium hydroxide (NaOH) aqueous solution and stirred at room temperature for 24 hours. The product is separated by centrifugation, washed and dried to obtain a crystallized...

Embodiment 2

[0029] Synthesis of manganese cobaltate nanowire arrays with spinel structure: First, the manganese nitrate aqueous solution (Mn(NO) 2 , 50wt%) and cobalt nitrate hexahydrate (Co(NO) 2 ·6H 2 O) Formulated with a molar ratio of 1:2 (Mn / Co) to a concentration of about 1g ml -1 Aqueous solution. Disperse 0.5g of the calcined mesoporous silica SBA-15 uniformly in 20ml of n-hexane, stir at room temperature for 3 hours, then take 0.5ml of the prepared metal nitrate aqueous solution and add it dropwise with vigorous stirring; stir; Volatilize the solvent for 12-24 hours to obtain a dry powder; place the composite material in a muffle furnace and calcinate at 380°C for 4-6 hours to decompose the metal nitrate to produce manganese cobaltate (MnCo) with a spinel structure. 2 O4 ); Finally, the silica template was removed with 20ml of 2M sodium hydroxide (NaOH) aqueous solution and stirred at room temperature for 24 hours. The product is separated by centrifugation, washed and dried to obtai...

Embodiment 3

[0032] Synthesis of nickel cobaltate nanowire arrays with spinel structure: firstly, nickel nitrate hexahydrate (Ni(NO) 2 ·6H 2 O) and cobalt nitrate hexahydrate (Co(NO) 2 ·6H 2 O) Formulated with a molar ratio of 1:2 (Ni / Co) to a concentration of about 1g ml -1 Aqueous solution. Disperse 0.5g of the calcined mesoporous silica SBA-15 uniformly in 20ml of n-hexane, stir at room temperature for 3 hours, then take 0.5ml of the prepared metal nitrate aqueous solution and add it dropwise with vigorous stirring; stir; Volatilize the solvent for 12-24 hours to obtain a dry powder; place the composite material in a muffle furnace and calcinate at 380°C for 4-6 hours to decompose the metal nitrate to form nickel cobaltate (NiCo) with a spinel structure. 2 O 4 ); Finally, the silica template was removed with 20ml of 2M sodium hydroxide (NaOH) aqueous solution and stirred at room temperature for 24 hours. The product is separated by centrifugation, washed and dried to obtain a crystallized n...

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Abstract

The invention discloses a method for reversely preparing a cobaltates nanowire array with a spinel structure taking mesoporous silicon oxide materials as solid templates, which is characterized in that the templates are evenly dispersed into an organic solvent which is immiscible with water at first; then, the beforehand prepared metal nitrate water solution is added into the above dispersion system drop by drop under the stirring condition; after being evenly mixed, the mixture is placed in the air to cause the solvent to be volatilized to obtain dry powder; the metal nitrate is decomposed to generate cobaltates with a spinel structure under the restricted space action of the template pores; finally, the silicon oxide templates are removed by a sodium hydroxide solution to obtain the cobaltates nanowire array with ordered mesoporous and the spinel structure. The prepared material has the advantages of high crystallinity, large specific surface area and uniform aperture, and the composition is adjustable and the structure is controllable.

Description

Technical field [0001] The invention relates to a method for preparing a cobaltate nanowire array with a mesoscopic order and a spinel structure, and belongs to the field of synthesis of inorganic nano materials and mesoporous materials. Background technique [0002] The mesoporous silica materials represented by MCM-41 and SBA-15 have many excellent physical and chemical properties such as ordered pore structure, large specific surface area and pore volume, adjustable pore size, and good thermal stability. Research interest. At the same time, the research on non-silicon oxide mesoporous materials is constantly expanding and deepening. In particular, transition metal oxide mesoporous materials, due to the variable chemical states of transition metal elements, have broad application prospects in the fields of catalysis, sensing, light, electricity, and magnetism. [0003] The preparation methods of mesoporous materials can be broadly divided into soft template method and hard temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C04B35/32
Inventor 高秋明朱靖康
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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