Method for preparing graphene-based nickel oxide nanocomposite

A nanocomposite material, graphene-based technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of toxic organic solvents, high-level charge density, unfriendly environment, etc., to achieve load The effect of high quantity, uniform dispersion, and large-scale production

Active Publication Date: 2015-12-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are hydrogen bonds and higher layer charge density between the hydroxide layers, so that it can only be stripped in organic solvents (J.Mater.Chem., 2001, 11:105; J.ColloidInterfaceSci., 2005 ,288:629)
Most organic solvents are toxic and unfriendly to the environment

Method used

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  • Method for preparing graphene-based nickel oxide nanocomposite
  • Method for preparing graphene-based nickel oxide nanocomposite
  • Method for preparing graphene-based nickel oxide nanocomposite

Examples

Experimental program
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Embodiment 1

[0028] The graphite oxide produced by the Hummers method was ultrasonically treated in deionized water, the ultrasonic time was 10min, the ultrasonic power was 600W, and the obtained concentration was 0.1mgmL -1 Negatively charged graphene oxide solution. 2.0137g of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 200ml of deionized water to obtain a concentration of 0.035molL -1 Nickel nitrate solution, magnetically stirred for 30min, then added dropwise NH 3 ·H 2 0 and constantly stirring, until the pH of the solution reaches 8, continue to stir for 20min, leave standstill 3h, obtain the nickel hydroxide solid precipitation after the suction filtration of gained precipitation solution 2 times then; Get nickel hydroxide precipitation 0.5g and add 300ml deionized water again through Ultrasonic treatment for 0.3h to obtain a positively charged nickel hydroxide suspension. According to the ratio of graphene oxide and nickel hydroxide mass ratio of 1:5, the graphene oxide aqueous solut...

Embodiment 2

[0031] The graphite oxide produced by the Hummers method was ultrasonically treated in deionized water, the ultrasonic time was 15min, the ultrasonic power was 650W, and the obtained concentration was 0.5mgmL -1 Negatively charged graphene oxide solution. 2.0926g of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 400ml of deionized water to obtain a concentration of 0.018molL -1 Nickel nitrate solution, magnetically stirred for 10min, then added dropwise NH 3 ·H 2 0 and constantly stirring, until the solution pH reaches 8.5, continue to stir for 25min, leave standstill 8h, obtain nickel hydroxide solid precipitation after the suction filtration of gained precipitation solution 3 times then; Get nickel hydroxide precipitation 0.6g and add 400ml deionized water again through 0.4h ultrasonic treatment to obtain a positively charged nickel hydroxide suspension. Mix the graphene oxide aqueous solution and nickel hydroxide suspension according to the solute mass ratio of 1:7, stir for 25...

Embodiment 3

[0034] The graphite oxide produced by the Hummers method was ultrasonically treated in deionized water, the ultrasonic time was 25min, the ultrasonic power was 700W, and the obtained concentration was 1mgmL -1 Negatively charged graphene oxide solution. 3.1074g of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 300ml of deionized water to obtain a concentration of 0.036molL -1 Nickel nitrate solution, magnetically stirred for 40min, then added dropwise NH 3 ·H 20 and constantly stirring, until the pH of the solution reaches 9, continue to stir for 30min, leave standstill 10h, then obtain nickel hydroxide solid precipitation after the suction filtration of gained precipitation solution 3 times; Get nickel hydroxide precipitation 0.9g and add 500ml deionized water again through 0.8h ultrasonic treatment to obtain a positively charged nickel hydroxide suspension. Mix the graphene oxide aqueous solution and nickel hydroxide suspension according to the solute mass ratio of 1:9, stir for...

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Abstract

A method for preparing a graphene-based nickel oxide nanocomposite is disclosed. The method comprises steps of: performing ultrasonic processing on graphite oxide in deionized water to obtain a graphene oxide solution; dissolving nickel nitrate into the deionized water, dropwise adding NH3.H20 until the pH of the solution reaching 8-10, stirring, standing and suction filtrating to obtain nickel hydroxide sediment; adding the nickel hydroxide sediment into the deionized water and performing ultrasonic processing to obtain a nickel hydroxide colloidal solution; mixing and stirring the graphene oxide solution and the nickel hydroxide colloidal solution, standing, suction filtrating, and then drying and grinding to obtain powdery graphene-based nickel oxide nanocomposite, calcining the powdery graphene-based nickel oxide nanocomposite in an inert atmosphere to obtain the graphene-based nickel oxide nanocomposite. The method has the advantages of simple preparation method, lower cost, environment friendliness and suitability for mass-scale production.

Description

[0001] Field [0002] The invention belongs to a method for preparing a graphene-based nickel oxide nanocomposite material. technical background [0003] Graphene is a new type of two-dimensional planar structure carbon material, it has the characteristics of ultra-high specific surface area and excellent electronic conductivity, making it an excellent carrier (Electrochim. Acta., 2013, 89:516). Recently, many researchers have devoted themselves to the synthesis of nanocomposites of transition metal oxides / hydroxides and graphene (J. Power Sources, 2013, 226:65-70). This nanocomposite material exhibits excellent electrochemical performance due to the synergistic effect between different components, and is expected to be used as an electrode material for supercapacitors (Adv. Mater., 2011, 23:4828). At present, the methods for preparing this kind of nanocomposite materials include: coprecipitation precipitation, hydrothermal method, and electrochemical deposition method, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/46B82Y30/00
Inventor 陈成猛魏强谢莉婧李倩仝云霄高逸丹
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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