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Hydrothermal Preparation of Graphene-like Cobalt Hydroxide Nanofilms

A cobalt hydroxide and nano-film technology, which is applied in the manufacture of hybrid/electric double-layer capacitors, etc., achieves the effects of low preparation cost, convenient operation and guaranteed product purity

Inactive Publication Date: 2017-10-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no relevant report on this graphene-like cobalt hydroxide nano-film material at home and abroad.

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  • Hydrothermal Preparation of Graphene-like Cobalt Hydroxide Nanofilms

Examples

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Effect test

Embodiment 1

[0029] Cobalt acetate and sodium acetate were made into 125g / L cobalt acetate solution and 12g / L sodium acetate solution with deionized water respectively. Take one liter of each of the two solutions, and put them in a constant temperature water bath at 45°C for 5 minutes, then pour 5ml of 28% ammonia solution into the above mixed solution, and stir evenly with an electric motor at a speed of 200 rpm , it can be seen that the color of the solution changes, and the reaction proceeds vigorously. After the reaction has been carried out for ten minutes, the solution is transferred to a hydrothermal device for treatment. The temperature is set at 100°C for 8 hours. After the reaction was completed, the obtained pink precipitate was washed and centrifuged three times with deionized water and absolute ethanol respectively, and dried in an air drying oven at 60° C. for 10 hours to obtain a graphene-like cobalt hydroxide nanofilm. The size of the nanofilm was about 20μm and a thickness...

Embodiment 2

[0031] Cobalt nitrate and sodium nitrate were made into 150g / L cobalt nitrate solution and 40g / L sodium nitrate solution with deionized water respectively. Take one liter of each of the two solutions, and put them into a constant temperature water bath at 65°C for 8 minutes, then pour 40ml of 28% ammonia solution to be used into the above mixed solution, and stir evenly with an electric motor at a speed of 500 rpm It can be seen that the color of the solution changes, and the reaction proceeds vigorously. After the reaction has been carried out for ten minutes, the solution is transferred to a hydrothermal device for treatment. The temperature is set at 150°C for 6 hours. After the reaction is completed, the resulting pink precipitate is washed and centrifuged three times with deionized water and absolute ethanol respectively, and dried in an air drying oven at 90°C for 8 hours to obtain a graphene-like cobalt hydroxide nanofilm, the nanofilm size is about 40μm, the thickness ...

Embodiment 3

[0033]Cobalt sulfate and sodium sulfate were made into 100g / L cobalt nitrate solution and 70g / L sodium nitrate solution with deionized water respectively. Take one liter of each of the two solutions, and put them in a constant temperature water bath at 75°C for 10 minutes, then pour 25ml of 28% ammonia solution into the above mixed solution, and stir evenly with an electric motor at a speed of 350 rpm It can be seen that the color of the solution changes, and the reaction proceeds vigorously. After the reaction has been carried out for ten minutes, the solution is transferred to a hydrothermal device for treatment. The temperature is set at 120°C for 12 hours. After the reaction was completed, the obtained pink precipitate was washed and centrifuged three times with deionized water and absolute ethanol respectively, and dried in an air drying oven at 80°C for 8 hours to obtain a graphene-like cobalt hydroxide nanofilm with a size of about 60μm, the thickness is about 20nm. Mi...

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Abstract

The invention discloses a hydrothermal preparation method for a graphene-like cobalt hydroxide nano film which can be used as a super capacitor electrode material. The method comprises the following steps: hydrated cobalt salt and sodium salt are respectively weighed and dissolved in deionized water to obtain 50-200g / L cobalt salt solution and 10-80g / L sodium salt solution, and ammonia of which the mass concentration is 28% is measured for use; cobalt salt solution and sodium salt solution of the same volume are taken and mixed, constant-temperature water bath heating is performed on the mixed solution, and stirring is carried out to make heating uniform; the ammonia is added to the mixed solution obtained in the step two, stirring is carried out to make the ammonia and the mixed solution react with each other for 10-15min to obtain a cobalt-ammonia complex solution containing sodium salt; hydrothermal treatment is performed; an obtained pink precipitate is cleaned and centrifuged, and is dried by an air drying oven to obtain powder. The preparation method of the invention is simple, convenient to operate and low in cost, and has good application prospects.

Description

technical field [0001] The invention relates to a preparation method of a supercapacitor electrode material, in particular to a hydrothermal preparation method of a graphene-like cobalt hydroxide nano film. Background technique [0002] With the development of industry, the demand for energy in today's world is increasing day by day, but the reserves of non-renewable energy are decreasing, and the environmental pollution caused by ore burning is becoming more and more serious. Therefore, it is necessary to improve the effective utilization and storage efficiency of energy. The next problem that urgently needs to be solved. In this context, supercapacitors emerged as the times require. They can store electrical energy efficiently, and have the advantages of short charging time, long service life, high energy saving and environmental friendliness. Therefore, they have been widely developed all over the world. research and application. [0003] There are two main types of sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
Inventor 邓意达冯超胡文彬陈亚琼王浩然张金凤万磊
Owner SHANGHAI JIAO TONG UNIV
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