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Cobalt molybdate-graphene nano compound and preparation method thereof

A nanocomposite, graphene technology, applied in cobalt compounds, carbon compounds, nanotechnology and other directions, to achieve the effects of large surface area, good application prospects and economic benefits

Active Publication Date: 2013-04-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are few reports on the use of cobalt molybdate for supercapacitors

Method used

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  • Cobalt molybdate-graphene nano compound and preparation method thereof
  • Cobalt molybdate-graphene nano compound and preparation method thereof
  • Cobalt molybdate-graphene nano compound and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Implementation example 1: The preparation method of cobalt molybdate-graphene (50 wt%) nanocomposite of the present invention comprises the following steps:

[0027] In the first step, graphite oxide is prepared by the Hummer method. Add 10 g of graphite powder to potassium persulfate (5 g) and phosphorus pentoxide (5 g) in concentrated sulfuric acid solution (15 mL) at 80 °C, pre-oxidize for 6 hours, then cool to room temperature, filter, and wash to medium sex. Add pre-oxidized graphite powder (10 g) to 230 mL of concentrated sulfuric acid solution at 0°C, then carefully add 30 g of potassium permanganate, then react at 35°C for 2 hours, and finally add 1L of deionized water to the reaction solution And 25mL of 30% hydrogen peroxide to terminate the reaction, filter, wash, and dialyze to obtain graphite oxide; place 80 mg of graphite oxide in 80mL water for ultrasonic dispersion for 120min;

[0028] In the second step, 0.366 mmol of cobalt nitrate was added to the...

Embodiment 2

[0032] Implementation example 2: The preparation method of cobalt molybdate-graphene (42 wt%) nanocomposite of the present invention comprises the following steps:

[0033] The first step, the preparation of graphite oxide is the same as in Example 1, and 80 mg of graphite oxide is placed in 80 mL of water for ultrasonic dispersion for 60 min;

[0034] In the second step, 0.5 mmol of cobalt acetate is added to the solution of the first step, stirred and dissolved, and stirred for 90 minutes;

[0035] In the third step, 0.071 mmol of ammonium paramolybdate was added to the mixed solution in the second step, and stirred for 30 minutes to adjust the pH value to 7;

[0036] The fourth step is to transfer the mixed solution of the third step to a hydrothermal kettle for reaction, the reaction temperature is 140°C, and the reaction time is 16h;

[0037] In the fifth step, the product of the fourth step was separated by filtration, washed, and dried to obtain a cobalt molybdate-gr...

Embodiment 3

[0038] Implementation example 3: The preparation method of cobalt molybdate-graphene (27 wt%) nanocomposite of the present invention comprises the following steps:

[0039] The first step, the preparation of graphite oxide is the same as in Example 1, and 80 mg of graphite oxide is placed in 80 mL of water for ultrasonic dispersion for 90 min;

[0040] In the second step, 1 mmol of cobalt nitrate is added to the solution of the first step, stirred and dissolved, and stirred for 40 minutes;

[0041] In the third step, 0.142 mmol of ammonium paramolybdate was added to the mixed solution in the second step, and stirred for 60 minutes to adjust the pH value to 7;

[0042] The fourth step is to transfer the mixed solution of the third step to a hydrothermal kettle for reaction, the reaction temperature is 180°C, and the reaction time is 12h;

[0043] In the fifth step, the product of the fourth step was separated by filtration, washed, and dried to obtain a cobalt molybdate-grap...

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Abstract

The invention discloses a cobalt molybdate-graphene nano compound and a preparation method thereof. The method comprises steps of putting the oxidation graphite into water and ultrasonic dispersing; putting the cobalt salt into the system, stirring and dissolving; later putting the ammonium molybdate into the system and adjusting the pH; then transferring the mixture system into a water heating kettle to perform reaction; and when the reaction is ended, the product passes through separation, washing and dryness, and the cobalt molybdate-graphene nano compound is gained. The material is provided with broad application prospects in the field of energy and other electronic device fields.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials, and in particular relates to a method for preparing cobalt molybdate-graphene nanocomposites, which use graphene as a support material and deposit uniformly dispersed cobalt molybdate nanoparticles on its surface . The material has broad application prospects in the fields of energy, sensing and other electronic devices. Background technique [0002] As an important member of molybdate - cobalt molybdate, due to its good electrochemical performance and excellent stability, it has begun to be used in supercapacitors, lithium-ion batteries and other fields. So far, there are few reports on the use of cobalt molybdate for supercapacitors. For the first time, Mai Liqiang and others grew cobalt molybdate on manganese molybdate nanorods by "self-assembly-orientation overlapping" and other methods, and obtained nanometer-sized cobalt molybdate (Mai LiQiang, Yang Fan, Zhao YunLong,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01B31/04B82Y30/00C01B32/192
Inventor 郝青丽雷武汪信夏锡锋王文娟
Owner NANJING UNIV OF SCI & TECH
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