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Activated graphene/needle-shaped nickel hydroxide nanocomposite material and preparation method thereof

A nanocomposite material, nickel hydroxide technology, applied in nanotechnology, nanotechnology, hybrid/electric double-layer capacitor manufacturing, etc., can solve the problem of low conductivity of transition metal hydroxides, insufficient energy density of capacitors, and incapable electronic Rapid transfer provides support and other issues to achieve the effects of excellent electrochemical performance, easy process control, and short production cycle

Active Publication Date: 2016-07-27
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 conductivity of transition metal hydroxides is small and cannot provide support for the rapid transfer of electrons during charge and discharge, so the energy density of this type of capacitor cannot be fully utilized and its application range is limited.

Method used

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  • Activated graphene/needle-shaped nickel hydroxide nanocomposite material and preparation method thereof
  • Activated graphene/needle-shaped nickel hydroxide nanocomposite material and preparation method thereof
  • Activated graphene/needle-shaped nickel hydroxide nanocomposite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] First weigh 1.5g of NaNO 3 The solid was dissolved in 69ml of 98% concentrated sulfuric acid, and the mixed solution was placed in an ice-water bath while magnetically stirring for 15min to make the NaNO 3 The solid is fully dissolved (the reaction temperature is controlled at 0°C); weigh 3.0g of natural graphite and add it to the above mixed solution, and stir for 15min (the temperature is also maintained at 0°C); then, slowly add a certain amount of potassium permanganate, During the addition process, control the reaction temperature not to exceed 20°C, stir for 20 minutes, adjust the temperature to 35°C and continue stirring for 1 hour; then add 138ml of deionized water to the mixture and raise the temperature to 98°C, stir for 15 minutes, and then add 420ml of deionized water ionized water and add 30ml of 30% H 2 o 2 To reduce the residual oxidant, the solution turns bright yellow; turn off the heating and filter while hot, while filtering, wash with 5% hydrochlor...

Embodiment 2

[0043] The preparation steps of graphene are as embodiment 1. Dissolve 1g NaOH in 100mL deionized water, add 1g graphene into the NaOH aqueous solution, fully stir and dry, put the mixture of graphene and NaOH in a nickel dry pot, put it into an activation furnace, and carry out in a nitrogen atmosphere. Activation, heating up to 800°C at a heating rate of 2°C / min, stopping heating after 2 hours of heat preservation and cooling naturally, washing with dilute hydrochloric acid and deionized water to pH = 7 after activation, and obtaining activated graphene after drying.

[0044] According to the mass ratio of activated graphene and the corresponding nickel element in the activated graphene / acicular nickel hydroxide nanocomposite material is 1:0.634 ratio, 0.31g nickel nitrate is dissolved in 200mL deionized water, 0.1g activated graphene Add it to nickel nitrate aqueous solution and ultrasonically disperse for 30 minutes. Add 1mol / L KOH aqueous solution dropwise to the above-m...

Embodiment 3

[0047] The preparation steps of graphene are as embodiment 1. Dissolve 5g KOH in 100mL deionized water, add 1g graphene into the KOH aqueous solution, fully stir and dry, put the mixture of graphene and KOH in a nickel dry pot, put it into an activation furnace, and carry out in a nitrogen atmosphere. Activation, heating up to 800°C at a heating rate of 2°C / min, stopping heating after 2 hours of heat preservation and cooling naturally, washing with dilute hydrochloric acid and deionized water to pH = 7 after activation, and obtaining activated graphene after drying.

[0048] According to the mass ratio of activated graphene and the corresponding nickel element in the activated graphene / acicular nickel hydroxide nanocomposite material being 1:1.90, 0.77g of nickel chloride was dissolved in 200mL of deionized water, and 0.1g of activated graphite Alkene was added to nickel nitrate aqueous solution, and ultrasonically dispersed for 30 minutes. Add 1 mol / L NaOH aqueous solution d...

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Abstract

The invention discloses an activated graphene / needle-shaped nickel hydroxide nanocomposite material and a preparation method thereof, and belongs to the technical field of a capacitor electrode material. According to the preparation method, graphene prepared by an oxidation-reduction method is taken as a raw material, KOH or NaOH is taken as an activating agent to prepare the activated graphene, and nanometer needle-shaped nickel hydroxide is loaded on the surface of the activated graphene to prepare the activated graphene / needle-shaped nickel hydroxide nanocomposite material. The activated graphene has very high specific area, and the nanometer needle-shaped nickel hydroxide is uniformly loaded on the surface of the activated graphene. The supercapacitor electrode prepared from the composite material has relatively high specific capacity and energy density and excellent cycle stability.

Description

technical field [0001] The invention relates to a preparation method of activated graphene / acicular nickel hydroxide nanocomposite material, in particular to a method for preparing supercapacitor electrode materials by compounding activated graphene and acicular nickel hydroxide, which belongs to capacitor electrodes field of materials technology. Background technique [0002] In recent years, the rapid development of the global economy and the continuous growth of people's demand for living materials have led to the depletion of fossil energy, which has brought serious environmental pollution and a derivative energy crisis. Therefore, the development of new energy and the technology of utilizing new energy have become the priority areas of development in various countries. New energy sources including solar energy, wind energy, nuclear energy, and tidal energy are discontinuous and unstable, and require an energy storage period to store them and then use them later. Chemi...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36B82Y30/00
CPCY02E60/13H01G11/86B82Y30/00H01G11/24H01G11/30H01G11/36
Inventor 赵东林林欢姚冉冉李成强朝辉
Owner BEIJING UNIV OF CHEM TECH
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