Synthesis method of cobaltous oxide nano-tube

A technology of cobaltous oxide and synthesis method, applied in the directions of cobalt oxide/cobalt hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of complex reaction process, poor morphology, low yield, etc., and achieve easy control of production conditions, The effect of high product purity and simple process

Inactive Publication Date: 2008-10-15
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Among them, the Co prepared by the colloidal template method 3 o 4 Nanotubes have poor morphology and low yield, which limits their large-scale production and application [X.Y.Shi, S.B.Han, R.J.Sanedrin, et al.Synthesis of Cobalt Oxide Nanotubes from Cobalt Oxide Nanotubes from Colloidal Particles Modified with aCo (III)-Cysteinato Precursor Chem.Mater.2002,14,1897-1902]; Co 3 o 4 Nanotubes make the whole reaction process more complicated, increase the preparation cost, and are not conducive to large-scale production [W.Yang, L.N.Xu, J.Chen.Co 3 o 4 Nanomaterials in Lithium-Ion Batteries and Gas Sensors Adv. Funct. Mater. 2005, 15, 851-857]
So far, there has been no report on the synthesis method of cobaltous oxide nanotubes

Method used

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  • Synthesis method of cobaltous oxide nano-tube
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  • Synthesis method of cobaltous oxide nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 0.00025mol of cobaltous nitrate and place it in a beaker, add 10ml of deionized water to dissolve it, then add 10ml of 0.1M ammonia solution dropwise under rapid stirring, continue to stir for 10 minutes after the precipitation is formed, and then dissolve the obtained Precipitation is centrifuged and washed until the pH of the washing solution is 8, and the precipitate is redispersed in 20ml of methanol solution with a weight concentration of 100%, and then according to the washed precipitate: hydrazine hydrate=1:0.1 parts by weight, add hydrazine hydrate as a reducing agent and Stir until dissolved, transfer the stirred and dissolved mixture into a closed stainless steel reactor, react at 250°C for 5 hours, cool to room temperature after the reaction, then wash the obtained product with deionized water and dry at 50°C get the product. The product was identified as cobaltous oxide by X-ray powder diffraction; the morphology of the product was nanotubes as detecte...

Embodiment 2

[0021] Weigh 0.00025mol of cobaltous nitrate and place it in a beaker, add 10ml of deionized water to dissolve it, then add 10ml of 0.2M ammonia solution dropwise under rapid stirring, continue stirring for 5 minutes after the precipitation is formed, and then dissolve the obtained Precipitation is centrifuged and washed until the pH of the washing liquid is 6, and the precipitation is redispersed in 25ml of weight concentration in methanol aqueous solution of 3%, then according to the washed precipitation: hydrazine hydrate=1: 10 parts by weight, add hydrazine hydrate as reducing agent and Stir until dissolved, transfer the stirred and dissolved mixture into a closed stainless steel reactor, react at 100°C for 30 hours, cool to room temperature after the reaction, then wash the obtained product with deionized water and dry at 80°C get the product. The product was identified as cobaltous oxide by X-ray powder diffraction; the morphology of the product was nanotubes as detected...

Embodiment 3

[0023] Weigh 0.00025mol of cobaltous nitrate and place it in a beaker, add 10ml of deionized water to dissolve it, then add 10ml of 0.2M ammonia solution dropwise under rapid stirring, continue to stir for 8 minutes after the precipitation is formed, and then dissolve the obtained Precipitation is centrifuged and washed until the pH of the washing liquid is 7, and the precipitation is redispersed in 30ml of weight concentration in methanol aqueous solution of 20%, then according to the washed precipitation: hydrazine hydrate=1: 5 parts by weight, add hydrazine hydrate as reducing agent and Stir until dissolved, transfer the stirred and dissolved mixture into a closed stainless steel reactor, react at 180°C for 20 hours, cool to room temperature after the reaction is complete, then wash the obtained product with deionized water, and dry it in a conventional vacuum get the product. The product was identified as cobaltous oxide by X-ray powder diffraction; the morphology of the p...

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Abstract

The present invention provides a synthesis method of cobaltous oxide nano tube. Said method includes the following steps: (a), in a soluble salt solution in which the cobaltous ions are dissolved, under the condition of stirring slowly-adding ammonia water solution until the precipitate is formed; (b), centrifugally washing the formed precipitate to make the pH value of washing liquor be neutral; (c), making the washed precipitate be again dispersed in the solvent, then adding reducing agent according to the weight portion ratio of washed precipitate: reducing agent=1:0.1-10, stirring them until they are completely dissolved; and (d), placing the above-mentioned materials into a closed reactor, making reaction for 5-30 h at 100-250 deg.C, cooling to room temperature, washing and drying so as to obtain the invented cobaltous oxide nano tube.

Description

Technical field: [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a production method of nanomaterials, in particular to a synthesis method of cobaltous oxide nanotubes. Background technique: [0002] Cobaltous oxide is an important fine chemical product, mainly used as chemical reagents, catalysts for petrochemical production, binders for alloy materials, and electrode material additives for rechargeable batteries. In recent years, as an effective additive in secondary battery materials, cobaltous oxide materials can improve the crystal form of active materials in the battery and increase the utilization rate by more than 10%. At the same time, it improves the oxidation process of the nickel electrode and reduces the internal stress of the pole piece. The charge and discharge efficiency is improved, the problem of insufficient discharge during use is solved, and the service life of the battery is prolonged. The production o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04B82B3/00
Inventor 唐波禚林海葛介超曹丽华李娜
Owner SHANDONG NORMAL UNIV
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