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Preparation method of TiO2/rGO composite

A technology of tetrabutyl titanate and absolute ethanol, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as not being used as electrocatalytic materials, and achieve easy reaction parameters The effect of control, short process and simple post-processing process

Inactive Publication Date: 2015-05-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although researchers have done a lot of research on catalytic materials for oxygen reduction under alkaline conditions, TiO 2 It is only used as a carrier for electrocatalytic materials, and has not been used as an electrocatalytic material
However, there is no research on the modification of TiO 2 Report on the synthesis method of high-performance electrocatalytic oxygen reduction materials directly loaded onto reduced graphene oxide sheets

Method used

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  • Preparation method of TiO2/rGO composite
  • Preparation method of TiO2/rGO composite
  • Preparation method of TiO2/rGO composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol, 3.00mL of ethylene glycol stock solution (pure ethylene glycol), slowly add 10.00mL of tetrabutyl titanate, and stir for 5 minutes to form a light Yellow transparent liquid, add 0.867g of ammonium fluoride, 1.406g of urea, 2mL of graphene oxide (1g / 100mL), stir until the solution is clear (about 5 min), and finally add 16.00mL of 6mol / L hydrochloric acid drop by drop, after fully stirring , transfer the reaction solution into a 100mL autoclave, heat to 200°C, take it out after 10 hours at constant temperature, wash the product three times with absolute ethanol, then wash three times with double distilled water, put it in a vacuum distillation device at 50°C Distilled under reduced pressure for 20 minutes to obtain a black powdery solid, which is TiO with high-efficiency electrocatalytic oxygen reduction performance. 2 / rGO composite material——TiO 2 / (1.5%) rGO.

[0033] ...

Embodiment 2

[0035] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol and 3.00mL of ethylene glycol stock solution, slowly add 10.00mL of tetrabutyl titanate as the raw material, stir for 5min, a light yellow transparent liquid is formed, add fluoride Ammonia 0.867g, urea 1.406g, graphene oxide 4mL (1g / 100mL), stir until the solution is clear (about 5 min), and finally add 6mol / L hydrochloric acid 16.00mL dropwise, after fully stirring, transfer the reaction solution to 100 In a 1 mL high-pressure reactor, heat to 200°C, take it out after constant temperature for 10 hours, wash the product three times with absolute ethanol, and then wash three times with double distilled water, put it in a vacuum distillation device for 20 minutes under reduced pressure at 50°C, A black powdery solid is obtained, which is TiO with high-efficiency electrocatalytic oxygen reduction performance. 2 / rGO composite material——TiO 2 / (3.0%) rGO.

[0036] Characteri...

Embodiment 3

[0038] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol and 3.00mL of ethylene glycol stock solution, slowly add 10.00mL of tetrabutyl titanate as the raw material, stir for 5min, a light yellow transparent liquid is formed, add fluoride Ammonia 0.867g, urea 1.406g, graphene oxide 6mL (1g / 100mL), fully stir the solution until it becomes clear (about 5 min), and finally add 6mol / L hydrochloric acid 16.00mL dropwise, after fully stirring, transfer the reaction solution into 100ml In a high-pressure reaction kettle, heat to 200°C, take it out after constant temperature for 10 hours, wash the product three times with absolute ethanol, then wash three times with double distilled water, put it in a vacuum distillation device for 20 minutes under reduced pressure at 50°C, and obtain Black powdery solid, which is TiO with high-efficiency electrocatalytic oxygen reduction performance 2 / rGO composite material——TiO 2 / (4.5%) rGO.

[003...

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Abstract

The invention relates to a preparation method of a TiO2 / rGO composite, and belongs to the technical field of electro-catalytic material preparation. The method comprises the step of keeping butyl titanate, oxidized graphene, absolute ethyl alcohol, glycol, urea and ammonium fluoride at a constant temperature being 190-230 DEG C for 8-12h under the condition of pH value being 1-4. The particle size of the TiO2 / rGO composite prepared by adopting the method is 3-5nm, and modified nano-TiO2 particles are uniformly attached to the surface of reduction-oxidation graphene. Compared with oxidized graphene, an oxygen-containing component of a carbon material in the reduction-oxidation graphene is reduced significantly; and N and F elements are doped in lattices of nano-TiO2 to form modified nano-TiO2, and the doping quantity is controllable. Raw materials are cheap and easy to obtain; the preparation operation is simple and easy; the aftertreatment process is simple; reaction parameters are easy to control; the flow is short; the energy consumption is low; and the electro-catalytic performance of the obtained composite is good.

Description

technical field [0001] The invention relates to a method for preparing TiO 2 The invention discloses a method for / rGO composite material, which belongs to the technical field of preparation of electrocatalytic materials. Background technique [0002] A fuel cell is a power generation device that directly and continuously converts the chemical energy present in chemical fuels and oxidants into electrical energy. focus on. For alkaline fuel cells, the oxygen reduction performance of cathode materials is a key technology restricting its development. Generally speaking, the electrochemical oxygen reduction reaction has different reaction mechanisms due to different electrode materials, surface properties, and solution pH values. Generally, it can be divided into two-electron reactions, direct four-electron reactions, and two-step two-electron (2+2) reaction processes. , is considered as an ideal oxygen reduction pathway because the four-electron reaction process can obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 于洁玫黄太仲刘宗明张以河翟利民
Owner UNIV OF JINAN
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