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Preparation method of alpha-type fe_2O_3 nanoparticles/multilayer graphene composite material

A multi-layer graphene and composite material technology, applied in the field of materials, can solve the problems of inability to obtain α-type iron oxide nanoparticles, expensive ferrous chloride, easy water absorption of ferrous chloride, etc., and achieve good redox reaction characteristics , Obvious charge and discharge platform, improve the effect of redox current

Active Publication Date: 2019-01-18
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When ferrous chloride is used as the iron source, due to the characteristics of ferrous chloride which is easy to absorb water and easy to oxidize, it is easy to cause the instability of the product
At the same time, the iron oxide in the composite material prepared by this method is magnetic γ-type iron oxide, so very uniform non-magnetic α-type iron oxide nanoparticles cannot be obtained.
Moreover, the price of high-purity ferrous chloride is more expensive

Method used

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  • Preparation method of alpha-type fe_2O_3 nanoparticles/multilayer graphene composite material
  • Preparation method of alpha-type fe_2O_3 nanoparticles/multilayer graphene composite material
  • Preparation method of alpha-type fe_2O_3 nanoparticles/multilayer graphene composite material

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preparation example Construction

[0034] see Figure 7 , showing the α-type Fe of the present invention 2 o 3 The preparation method of nanoparticle / multilayer graphene composite material specifically comprises the following steps:

[0035] Step S1: Measure DMF and deionized water with a volume ratio of 8:2, and mix them uniformly as mixed solvent A.

[0036] Step S2: Weighing a certain amount of expanded graphite and adding it to the mixed solution of DMF and distilled water, ultrasonicating for 3 hours, exfoliating the expanded graphite into multi-layer graphene and uniformly dispersing it in the solvent to obtain multi-layer graphene dispersion B. The concentration of multilayer graphene in mixed solvent A is 0.5-2 mg / mL.

[0037] Step S3: Measure nitric acid and deionized water to prepare 2 mol / L dilute nitric acid solution C.

[0038]Step S4: Weigh iron powder with a concentration of 1-5 mg / mL relative to solvent A and anhydrous sodium acetate of 10 mg / mL, and pour them into liquid B. Then measure so...

Embodiment 1

[0043] Mix 8ml DMF and 2ml distilled water as a mixed solvent, add 15mg expanded graphite, and obtain the desired multilayer graphene solution after ultrasonic oscillation for 3 hours, add 100mg anhydrous sodium acetate and 10mg iron powder to the multilayer graphene solution, and then add 2ml is prepared into a dilute nitric acid solution with a molar concentration of 2mol / L. Then, it was stirred in a water bath at 80° C. and a rotation speed of 320 / min for 4 hours. The reactants were taken out and centrifuged three times with alcohol and distilled water respectively, and finally dried in a drying oven at 60°C for 24 hours to obtain α-Fe 2 o 3 Nanoparticle / multilayer graphene composites.

Embodiment 2

[0045] Mix 8ml DMF and 2ml distilled water as a mixed solvent, add 5mg expanded graphite, and obtain the required multilayer graphene solution after ultrasonic oscillation for 3 hours, add 100m anhydrous sodium acetate and 20mg iron powder to the multilayer graphene solution, and then add 1ml dilute nitric acid. Then, it was stirred in a water bath at 70° C. and a rotation speed of 320 / min for 6 hours. The reactants were taken out and centrifuged three times with alcohol and distilled water respectively, and finally dried in a drying oven at 60°C for 24 hours to obtain α-Fe 2 o 3 Nanoparticle / multilayer graphene composites.

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Abstract

The invention discloses a method for directly preparing uniform alpha-type Fe2O3 nanoparticles / multilayer graphene composite material by using iron powder. Comprises the following steps: DMF and deionized water with volume ratio of 8: 2 are mixed as mixed solvent; Expanded graphite was added and treated with ultrasonic wave for 3 hours to obtain multilayer graphene mixed solution. Fe powder, dilute nitric acid and anhydrous sodium acetate are added into that mix solution; The solution is stirred in a water bath at 70-90 DEG C for 4-10 hours, cooled and centrifugally cleaned to collect black products; 3 time of centrifugal cleaning of that reactant with alcohol and water respectively, and drying in an oven at 60 DEG C for 12 hour to obtain the dried alpha-type Fe2O3 nanoparticle / multilayergraphene composite material of the invention. The invention has the advantages of simple process, wide material source, low cost, nano-sized alpha-type Fe2O3 particles, uniform particles and good dispersibility.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to an α-type Fe 2 o 3 The preparation method of the nanoparticle / multilayer graphene composite material, the prepared material has use value in the field of energy storage, especially in the negative electrode material of supercapacitor and lithium ion battery. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between traditional capacitors and rechargeable batteries. It has the characteristics of fast charging and discharging, and also has the energy storage mechanism of electrochemical batteries. Compared with traditional capacitors, supercapacitors have the characteristics of high power density, long cycle life, no pollution, and wide operating temperature range. At present, supercapacitors that have been marketed mainly use carbon materials with high specific surface area, which mainly rely on el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/26H01G11/86
CPCH01G11/24H01G11/26H01G11/32H01G11/86Y02E60/13
Inventor 徐军明盛威胡晓萍武军
Owner HANGZHOU DIANZI UNIV
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