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Nano titanium dioxide/graphene composite material and preparation method thereof

A nano-titanium dioxide and composite material technology is applied in the field of nano-titanium dioxide/graphene composite materials and their preparation, which can solve the problems of no chemical bonding, incomplete bonding, and inability to composite, so as to suppress accumulation and agglomeration, be difficult to decay, and improve electrical conductivity. poor sex effect

Inactive Publication Date: 2016-05-04
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods of introducing titanium dioxide have certain advantages and advancements, but directly adding the titanium source to the graphene solution will cause problems such as incomplete combination or inability to combine the two due to the incomplete synchronization of the hydrolysis reaction and the composite reaction, and the introduction of titanium dioxide Due to the incomplete contact between the powder and the liquid, the powder may precipitate separately, only mechanical mixing, no chemical combination

Method used

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  • Nano titanium dioxide/graphene composite material and preparation method thereof
  • Nano titanium dioxide/graphene composite material and preparation method thereof
  • Nano titanium dioxide/graphene composite material and preparation method thereof

Examples

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Embodiment 1

[0036] A preparation method of nano-titanium dioxide / graphene composite material, comprising the following steps:

[0037] (1) Preparation of graphene oxide colloid: use the improved hummer method to prepare graphite oxide, add flake graphite (2g) into ice-bathed concentrated sulfuric acid (98wt%, 69ml), stir for 30min, add potassium permanganate (8g) The above solution was stirred for 2h. Moved to 35 ℃ water bath and stirred for 12h. Add 276ml deionized water three times, after adding, add H 2 o 2 (30%, 25ml) centrifuge, wash, dry and grind to get graphite oxide. 0.2 g of graphite oxide powder was ultrasonically dispersed in 400 ml of deionized water to obtain graphene oxide colloid with a concentration of 0.5 mg / ml.

[0038](2) Preparation of titanium dioxide colloid: Mix glacial acetic acid (20.00ml) and tetrabutyl titanate (20.00ml) and stir for 30 minutes to obtain solution A, mix glacial acetic acid (5.00ml) and deionized water (95ml) to obtain solution B, put Drop ...

Embodiment 2

[0045] A preparation method of nano-titanium dioxide / graphene composite material, comprising the following steps:

[0046] Graphene oxide colloid and titanium dioxide colloid were prepared according to the same method as in Example 1. Measure 6.2ml of titanium dioxide colloid and drop it into the graphene oxide colloid (400ml, 0.5mg / ml) in a stirring state. Pour off the supernatant, transfer the turbid floc liquid to a high-temperature reaction kettle, add 0.5g sodium borohydride, and react at 140°C for 14 hours. After the reaction is complete, cool, centrifuge, dry, and grind to obtain the mass ratio of titanium dioxide to graphene It is a 5:5 titanium dioxide / graphene composite material.

[0047] Mix the titanium dioxide / graphene composite, acetylene black, and PTFE at a mass ratio of 80:10:10, add an appropriate amount of ethanol, disperse ultrasonically, coat the nickel foam, dry, press into tablets, and make a cyclic voltammetry curve measurement (see Figure 4 ), the c...

Embodiment 3

[0049] A preparation method of nano-titanium dioxide / graphene composite material, comprising the following steps:

[0050] Graphene oxide colloid and titanium dioxide colloid were prepared according to the method of Example 1. Measure 2.6ml of titanium dioxide colloid and drop it into graphene oxide colloid (400ml, 0.5mg / ml) under stirring state. Remove the supernatant, transfer the turbid floc liquid to a high-temperature reaction kettle, add 0.5g sodium borohydride, and react at 140°C for 14 hours. After the reaction is complete, cool, centrifuge, dry, and grind to obtain a mass ratio of titanium dioxide to graphene A titanium dioxide / graphene composite material with a mass ratio of 3:7. Mix titanium dioxide / graphene composite, acetylene black, and PVDF at a mass ratio of 80:10:10, add a certain amount of NMF (1-methylpyrrolidone), grind it into a slurry, coat it on copper foil, and bake dry, cut into pieces, assembled into a button battery, and measured on a charge-dischar...

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Abstract

The invention belongs to the nano composite preparation field and relates to a nano titanium dioxide / graphene composite material and a preparation method thereof. The method includes the following steps that: positively charged titanium dioxide sol and negatively charged graphene oxide sol are mixed together so as to form floc sediments; and sodium borohydride hydrothermal reduction is carried out, so that the nano titanium dioxide / graphene composite material can be obtained. The nano titanium dioxide / graphene composite material has large specific surface area and high electrochemical performance; the nano titanium dioxide / graphene composite material can be used as the electrode material of a super capacitor, so that the electrode material can have high specific capacity and high cyclic stability; the nano titanium dioxide / graphene composite material can be also used as the anode material of a lithium ion battery, so that the anode material can have high stability and little possibility of decay; selected preparation materials are safe, nontoxic, environmentally friendly and pollution-free; and the preparation process is simple, feasible and safe, does not introduce toxic substances, and is low in cost, and therefore, industrialization can be facilitated.

Description

technical field [0001] The invention belongs to the field of nano composite material preparation, in particular to a nano titanium dioxide / graphene composite material and a preparation method thereof. Background technique [0002] Due to the increasing shortage of petroleum resources and the increasing demand for electricity and energy in various application fields, researchers have to work hard to develop various energy storage devices. Supercapacitors, because of their unique properties, such as fast charging and discharging, high power density and long cycle life, have become supplements to secondary batteries, which can partially or completely replace traditional chemical batteries for traction power and starting energy of vehicles, and It has a wider range of uses than traditional chemical batteries. [0003] Suitable materials for supercapacitors should have the following characteristics: good electrical conductivity, high surface area, and suitable void size. The tw...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36H01G11/46H01M4/36
CPCH01G11/24H01G11/30H01G11/36H01G11/46H01G11/86H01M4/366Y02E60/10Y02E60/13
Inventor 张建民李亚珂刘玉山王艳坤高成伟严芳芳王子逢
Owner ZHENGZHOU UNIV
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