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Titanium oxide with core-shell structure and its controllable preparation method

A titanium oxide, core-shell structure technology, applied in the field of materials science, to achieve the effects of controllable microscopic structural units, improved electrocatalytic performance, and small particle size

Active Publication Date: 2018-08-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Is it possible to achieve the preparation of titania and its surface structure regulation under low temperature conditions, so that it has excellent electrocatalytic performance? At present, there are no literature reports or patent applications on the low-cost and controllable preparation of pure phases of titanium dioxide and the regulation of the core-shell structure covered by the surface amorphous layer.

Method used

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  • Titanium oxide with core-shell structure and its controllable preparation method
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  • Titanium oxide with core-shell structure and its controllable preparation method

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preparation example Construction

[0031] The invention provides a titanium oxide with a core-shell structure coated with an amorphous layer on the surface and a method for preparing the pure phase of the titanium oxide under low temperature conditions with low cost and controllable control. The reduction of titanium dioxide by an active metal enables the controllable preparation of titanium dioxide at a relatively low temperature (550°C). The TiO prepared under this low-temperature condition has a unique core-shell structure covered by an amorphous layer on the surface, and has excellent electrocatalytic oxygen reduction performance.

[0032] In the present invention, as long as titanium dioxide can be transformed into a rutile phase by a suitable method, the microscopic morphology of titanium dioxide (rutile titanium dioxide) includes but is not limited to various shapes such as balls, rods, strips, tubes and irregular polygons.

[0033] In the present invention, the particle diameter of titanium dioxide may ...

Embodiment 1

[0060] (1) Titanium dioxide is used as a precursor, and metal magnesium is used as a reducing agent, wherein, in terms of molar percentage, metal magnesium: TiO 2 =55% weighed and ground and mixed in a mortar;

[0061] (2) Add the uniformly mixed powder into a quartz tube with an open end, connect a vacuum pump to make the vacuum less than 1 Pa, and then use a hydrogen-oxygen flame gun to melt and seal the open end of the quartz tube;

[0062] (3) Place the vacuum-tight quartz tube in a muffle furnace, raise the temperature from 30°C to 450°C at a rate of 1°C / min, keep it warm for 6 hours, and then rise from 450°C to 550°C at a rate of 1°C / min ℃, keep warm for 6 hours and then cool with the furnace;

[0063] (4) Open the vacuum-tight quartz tube, mix the gained black powder with water and stir for 6 hours, remove part of the incompletely reacted metal;

[0064](5) Suction filter the stirred solution, add 1M dilute hydrochloric acid, mix and stir for 6 hours, add deionized wa...

Embodiment 2

[0066] (1) Titanium dioxide is used as a precursor, and metal magnesium is used as a reducing agent, wherein, in terms of molar percentage, metal magnesium: TiO 2 =105% weighed and ground in a mortar and mixed evenly;

[0067] (2) Add the uniformly mixed powder into a quartz tube with an open end, connect a vacuum pump to make the vacuum less than 1 Pa, and then use a hydrogen-oxygen flame gun to melt and seal the open end of the quartz tube;

[0068] (3) Place the vacuum-tight quartz tube in a muffle furnace, raise the temperature from 30°C to 450°C at a rate of 1°C / min, keep it warm for 6 hours, and then rise from 450°C to 550°C at a rate of 1°C / min ℃, keep warm for 6 hours and then cool with the furnace;

[0069] (4) Open the vacuum-tight quartz tube, mix the gained black powder with water and stir for 6 hours, remove part of the incompletely reacted metal;

[0070] (5) Suction filter the stirred solution, add 1M dilute hydrochloric acid, mix and stir for 6 hours, add dei...

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Abstract

The present invention relates to titanium suboxide with a core-shell structure and a controllable preparation method thereof. The titanium suboxide has a core-shell structure and its surface is coated with an amorphous layer of titanium suboxide. The titanium suboxide in the present invention has a unique core-shell structure covered with an amorphous layer of titanium suboxide on the surface. It not only has unique electrical and optical properties, excellent thermal stability and ultra-high conductivity of titanium suboxide. , also has good properties such as small particle size, high specific surface area, and controllable microstructural units. It can be used in catalysts and catalyst carriers, efficient conductive materials, and the preparation of efficient rechargeable batteries.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to titanium dioxide with a surface amorphous layer covering a core-shell structure and a controllable preparation method thereof. Background technique [0002] Titanium oxide is a general term for a series of non-stoichiometric titanium oxides (Ti n o 2n-1 ), has many advantages such as high electrical conductivity (conductivity 1500S / cm, much higher than graphite material), high chemical stability (resistant to strong acid and strong alkali) and electrochemical stability (stable voltage window in aqueous solution is above 3.0V). It has good application prospects in the fields of catalyst / catalyst carrier, fuel cell, liquid flow battery and so on. [0003] In 1959, Magnéli first studied the crystal structure of this kind of substance, so titanium suboxide is also called Magnéli phase titanium oxide. Titanium oxide has a crystal structure based on rutile titan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/04B01J21/06
CPCC01G23/043B01J21/063C01P2002/77C01P2002/72C01P2004/04C01P2004/03C01P2004/30C01P2004/61C01P2004/62C01P2004/64C01P2006/40B01J35/33B01J35/397
Inventor 黄富强徐吉健
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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