Nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial and preparation method thereof

A technology of composite nanomaterials and bacterial cellulose, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor conductivity and poor conductivity of graphene oxide, and achieve easy Effects of immobilization, improvement of catalytic performance, and improvement of electrical conductivity

Active Publication Date: 2017-02-15
NANJING UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

However, bacterial cellulose itself does not conduct electricity, and graphene oxide has poorer conductivity than graphene, which leads to poor overall conductivity of bacterial cellulose / graphene oxide composites, and good electrical conductivity is the key to obtaining a good battery or storage battery. Necessary properties to be able to wait for the effect

Method used

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  • Nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial and preparation method thereof
  • Nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial and preparation method thereof
  • Nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial and preparation method thereof

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preparation example Construction

[0024] A kind of preparation method of nitrogen-doped carbonized bacterial cellulose / graphene / platinum composite nanomaterial of the present invention, flow chart is as follows figure 1 shown, including the following steps:

[0025] The first step: take the flocculent bacterial cellulose statically fermented by Acetobacter xylinum, and use 0.1% to 4% NaOH and 0.1% to 4% H 2 o 2 Treat at 60-90°C for 1-5 hours. Rinse with continuous flowing tap water (obtain pure flocculent bacterial cellulose raw material). Place the treated flocculent bacterial cellulose in a freeze dryer to freeze-dry at a temperature of -47 to -54°C for 10 to 24 hours, and use it in a vacuum bag;

[0026] The second step: disperse the graphene oxide prepared by the improved Hummers method in water, and disperse it with 100W ultrasonic to form a uniform graphene oxide suspension; use the prepared flocculent bacterial cellulose with a high-speed homogenizer at a speed of 15000r / min Homogenize for 30 minute...

Embodiment 1

[0031] The flocculent bacterial cellulose statically fermented by Acetobacter xylinum was treated with 0.1% NaOH and 0.1% H 2 o 2Treat it in a water bath at 90°C for 3 hours, take it out and wash it with tap water until neutral, place it in a freeze dryer to dry for 24 hours, take it out and use a high-speed homogenizer at a speed of 15000r / min to homogenize the bacterial cellulose for 30 minutes to obtain a uniform bacterial cellulose solution , then add 10mL graphene oxide suspension, 20°C, 100W ultrasonic to make it evenly dispersed, then add dopamine solution, mechanically stir at 25°C-30°C for 2h, add chloroplatinic acid solution, continue stirring for 4h; The product was filtered, washed with deionized water to neutrality, and then freeze-dried for 24 hours to obtain the bacterial cellulose / graphene oxide / platinum precursor composite material. Raise the temperature to 400°C, keep it warm for 1 hour, raise the temperature to 800°C, keep the temperature for 2 hours, and c...

Embodiment 2

[0034] The flocculent bacterial cellulose statically fermented by Acetobacter xylinum was treated with 0.2% NaOH and 0.2% H 2 o 2 Treat it in a water bath at 80°C for 2 hours, take it out and wash it with tap water until neutral, place it in a freeze dryer to dry for 20 hours, take it out and homogenize the bacterial cellulose with a high-speed homogenizer at a speed of 10,000r / min for 30 minutes to obtain a uniform bacterial cellulose solution , then add 10mL graphene oxide suspension, 20°C, 100W ultrasonic to make it evenly dispersed, then add dopamine solution, mechanically stir at 25°C-30°C for 2h, add chloroplatinic acid solution, continue stirring for 4h; The product was filtered, washed with deionized water to neutrality, and then freeze-dried for 24 hours to obtain the bacterial cellulose / graphene oxide / platinum precursor composite material. Raise the temperature to 400°C, keep it warm for 1 hour, raise the temperature to 900°C, keep the temperature for 2 hours, and c...

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Abstract

The present invention discloses a preparation method of a nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial. The material is prepared according to the following steps of pre-treating flocculent bacterial cellulose generated in fermentation of acetobacter xylophilus, then refrigering and drying the flocculent bacterial cellulose so as to obtain flocculent bacterial cellulose; homogenizing at high speed so as to obtain a uniform solution, mixing the uniform solution with graphene oxide, and dispersing the mixture uniformly through ultrasonic; and adding a dopamine solution, stirring and mixing by using a machine, adding chloroplatinic acid finally, and carbonizing at high temperature so as to obtain the nitrogen doping carbonized bacterial cellulose/graphene/platinum composite nanomaterial. The composite nanomaterial prepared by the method uses a one-step method to carbonize, and the reaction process is easy. Under the action of the dopamine, the flocculent bacterial cellulose and the graphene oxide are bonded, so as to form a three-dimensional networked cross-linked skeleton structure. In carbonization, nitrogen doping and platinum reduction are realized, and the conductive nanometer composite system that has small and uniformly distributed particles is prepared. The nanomaterial prepared by the method can be applied to application fields such as fuel batteries and super capacitors.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a preparation method of nitrogen-doped carbonized bacterial cellulose / graphene / platinum composite nanomaterials. Background technique [0002] Graphene (Graphene, referred to as GE) is made of sp 2 A two-dimensional crystalline material made of hybrid carbon atoms with only one atomic thickness. Due to its excellent electrical conductivity, high specific surface area, and good environmental stability, it has attracted extensive attention in recent years. However, due to the strong π-π stacking between layers, graphene is very easy to cause irreversible agglomeration or stacking, and it is difficult to disperse uniformly. Graphene oxide (GO for short) is an important derivative material of graphene. Due to its typical quasi-two-dimensional spatial structure, rich oxygen-containing groups, good hydrophilicity and mechanical properties, dispersion stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/9075Y02E60/50
Inventor 孙东平袁凡舒黄洋陈春涛范孟孟张衡杨加志
Owner NANJING UNIV OF SCI & TECH
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