Preparation method of graphene loaded with anatase type nano titanium dioxide and application thereof

A nano-titanium dioxide and anatase-type technology, applied in the field of electrochemical power supply, can solve the problems of unfavorable uniform dispersion of nano-titanium dioxide, poor stability of graphene suspension, environmental pollution, etc., and achieve low cost, easy operation, and high discharge specific capacity Effect

Inactive Publication Date: 2012-01-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Relevant literature reports [Self-Assembled TiO2-Graphene Hybrid Nanostructures for Enhanced Li-Ion Insertion], using self-assembly method to prepare nano-titanium dioxide-supported graphene composite materials for research on the efficiency of lithium-ion batteries, the graphene used in this literature Gained for rapid temperature rise and expansion, the resulting graphene suspension has poor stability, which is not conducive to the uniform dispersion of nano-titanium dioxide on the graphene sheet. In order to achieve the purpose of dispersion, an anionic sulfuric acid surfactant is used to stabilize the aqueous solution of graphene. reduce the preparation cost and pollute the environment

Method used

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  • Preparation method of graphene loaded with anatase type nano titanium dioxide and application thereof
  • Preparation method of graphene loaded with anatase type nano titanium dioxide and application thereof
  • Preparation method of graphene loaded with anatase type nano titanium dioxide and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Add 3g of natural flake graphite to 120ml of sulfuric acid with a mass concentration of 98%, and slowly add 15g of potassium permanganate while stirring the mixture at a rate of 200rpm in an ice-water bath; During the process, continue to stir for 1 hour; raise the temperature of the water bath to 65°C and stir for 2 hours, while stirring, slowly add 250ml of deionized water, add deionized water to the resulting mixture to 1400ml, then add 30ml of hydrogen peroxide with a mass concentration of 30%, and react 20min. The resulting product was centrifuged and washed with dilute hydrochloric acid with a mass concentration of 5%, until no SO 4 2- (with BaCl 2 Inspection), the obtained washings were dried in a vacuum oven at a temperature of 60° C. to obtain graphite oxide.

[0021] Take 100 mg of graphite oxide obtained in the above steps and disperse it in 100 ml of deionized water, and ultrasonically peel it off for 2 hours to obtain a graphene oxide solution with a con...

Embodiment 2

[0025] The process of preparing graphene loaded with anatase-type nano-titanium dioxide in this example is the same as that of Example 1, except that the calcination temperature is changed from 500°C in Example 1 to 400°C, and calcined for 2h to obtain nano Graphene supported on titania. The XRD spectrogram of the graphene supported by nano titanium dioxide made by the present embodiment is as follows Figure 4 As shown in (b), it can be seen from the figure that the crystallinity of the anatase crystal form of nano-titanium dioxide is lower than that in Example 1.

Embodiment 3

[0027] The process of preparing graphene loaded with anatase-type nano-titanium dioxide in this example is the same as that of Example 1, except that the calcination temperature is changed from 500°C in Example 1 to 300°C, and calcined for 2 hours to obtain nano Graphene supported on titania. The XRD spectrogram of the graphene supported by the nano-titanium dioxide prepared by the present embodiment is as follows Figure 4 As shown in (c), it can be seen from the figure that the crystallinity of the anatase crystal form of nano-titanium dioxide is lower than that in Example 1 and Example 2.

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Abstract

The invention discloses a preparation method of graphene loaded with anatase type nano titanium dioxide and an application thereof. The preparation method comprises the following steps: preparing graphite oxide from crystalline flake graphite; carrying out reduction reaction on the graphite oxide to obtain graphene by taking hydrazine hydrate as a reducing agent and sodium dodecyl benzene sulfonate as a dispersing agent; preparing titanium hydroxide colloidal solution by taking tetrabutyl titanate as a titanium source; mixing the ethanol solution of graphene and the titanium hydroxide colloidal solution, stirring and calcining to prepare the graphene loaded with anatase type nano titanium dioxide. The graphene loaded with anatase type nano titanium dioxide prepared by the method can be mixed with copper powder to prepare the negative electrode of a nickel-hydride secondary battery. The method provided by the invention has the advantages of simple preparation process and low cost and is easy to operate. When the prepared graphene loaded with anatase type nano titanium dioxide is used as the active material of the cathode of the secondary battery, the effects of high discharge specific capacity and good circulation stability are achieved.

Description

technical field [0001] The invention relates to a preparation method and application of graphene loaded with anatase titanium dioxide, belonging to the field of electrochemical power sources. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered in recent years. It is a single-layer or multi-layer extremely thin graphite material. It is currently one of the research hotspots in the field of carbonaceous materials and condensed matter physics. Graphene is the building block of zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional bulk graphite Sp 2 The basic structural unit of hybridized carbons. Graphene has many strange properties. Graphene is a substance without an energy gap, showing metallicity; in single-layer graphene, each carbon atom has an unbonded electron, so it has very good conductivity; holes and electrons in graphene Separation from each other leads to the creation of new electron conductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/24B82Y40/00
CPCY02E60/124Y02E60/10
Inventor 赵乃勤于艳敏师春生刘恩佐何春年李家俊
Owner TIANJIN UNIV
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