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Hollow sphere adopting metal oxide/Pt/C three-layer nano structure and preparation method of hollow sphere

A nanostructure and oxide layer technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of limiting solar energy utilization, waste of photogenerated electron holes, etc., and achieve the effect of low cost, simple method, and conducive to industrial production

Inactive Publication Date: 2015-11-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads to the waste of most of the photogenerated electron holes, which greatly limits the utilization of solar energy.

Method used

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  • Hollow sphere adopting metal oxide/Pt/C three-layer nano structure and preparation method of hollow sphere
  • Hollow sphere adopting metal oxide/Pt/C three-layer nano structure and preparation method of hollow sphere
  • Hollow sphere adopting metal oxide/Pt/C three-layer nano structure and preparation method of hollow sphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] TiO 2 / Pt / C nano hollow spheres:

[0023] (1) 0.34g of tetrabutyl titanate is dissolved in 100mL of ethanol to obtain a 0.01M titanium ion solution, and then 0.1g of SiO with carboxyl and hydroxyl groups on the surface is added to the adsorption solution 2 Spherical template, ultrasonically disperse the spherical template, stir and adsorb for 4 hours, then centrifuge to obtain the adsorbed spherical template, place at 60°C, and dry for 6 hours;

[0024] (2) After the sample obtained in step (1) was heat-treated in air at 300°C for 60h, then immersed in a NaOH solution with a concentration of 1M at 60°C for 0.5h to remove SiO 2 Spherical template to obtain titanium oxide hollow spherical shell;

[0025] (3) the 10mgTiO obtained in step 2) 2 The hollow spheres were added to 10 mL of the noble metal platinum chloroplatinic acid solution with a concentration of 0.05 mg / mL, and the water in the solution was evaporated to dryness at 60° C. to collect samples. The obtained...

Embodiment 2

[0029] Bi 2 o 3 / Pt / C nano hollow spheres:

[0030] (1) 24g of bismuth nitrate pentahydrate was dissolved in 50mL of ethylene glycol to obtain a 1M bismuth ion solution, and then 0.5g of carbon spherical templates with carboxyl and hydroxyl groups on the surface were added to the adsorption solution, and the spherical template was fully dispersed by ultrasound, Stir and adsorb for 48 hours and then centrifuge to obtain the adsorbed spherical template, place it at 100°C and dry for 48 hours;

[0031] (2) The sample obtained in step (1) was heat-treated in air at 500°C for 20 hours to obtain Bi 2 o 3 Hollow spherical shell;

[0032] (3) The 100mgBi obtained in step 2) 2 o 3 The hollow spheres were added to 50 mL of 1 mg / mL chloroplatinic acid solution of noble metal platinum, and the water in the solution was evaporated to dryness at 100 ° C to collect samples. The obtained sample was heat-treated at 300 °C for 6 h in a hydrogen atmosphere to obtain Bi 2 o 3 / Pt nano ho...

Embodiment 3

[0035] CeO 2 / Pt / C nano hollow spheres:

[0036] (1) 21.7g of cerium nitrate hexahydrate was dissolved in 100mL of ethanol to obtain a 0.5M bismuth ion solution, and then 0.8g of PS spherical templates with carboxyl and hydroxyl groups on the surface were added to the adsorption solution, and the spherical templates were fully dispersed by ultrasound. Stir and adsorb for 12 hours, then centrifuge to obtain the adsorbed spherical template, place at 80°C, and dry for 24 hours;

[0037] (2) After the sample obtained in step (1) was heat-treated in air at 800 °C for 3 h, CeO 2 Hollow spherical shell;

[0038] (3) the 50mgCeO obtained in step 2) 2 The hollow spheres were added to 30 mL of the noble metal platinum chloroplatinic acid solution with a concentration of 0.5 mg / mL, and the water in the solution was evaporated to dryness at 80° C. to collect samples. The obtained sample was heat-treated at 250 °C for 4 h in a hydrogen atmosphere to obtain CeO 2 / Pt nano hollow sphere...

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Abstract

The invention discloses a hollow sphere adopting a metal oxide / Pt / C three-layer nano structure. A spherical shell of the hollow sphere sequentially comprises a metal oxide layer, a Pt layer and an amorphous carbon layer from inside to outside. A template adsorption method is used, a hollow metal oxide sphere is prepared firstly, Pt particles are prepared on the surface of metal oxide with an impregnation method, finally, the surface of the hollow metal oxide sphere coated with the Pt particles is coated with amorphous carbon through hydro-thermal treatment, and then the hollow sphere adopting the metal oxide / Pt / C three-layer nano structure is prepared. The prepared hollow sphere with the metal oxide / Pt / C three-layer nano structure has a regular core-shell structure, the thickness is adjustable, and the specific surface area is larger than 200 m <2> / g. A method is simple, the cost is lower, industrial production can be easily realized, and the hollow sphere can be well applied to fields such as photocatalytic decomposition of water for hydrogen production, gas sensing, super capacitors, lithium ion batteries and the like.

Description

technical field [0001] The invention relates to a nano hollow sphere and a preparation method thereof, in particular to a metal oxide / Pt / C three-layer nanostructure hollow sphere and a preparation method thereof. Background technique [0002] Hydrogen production by photocatalytic water splitting is the best way for photochemical conversion of solar energy, because hydrogen energy, as a secondary energy source, has advantages that other energy sources cannot match, such as cleanliness, safety, and high efficiency. Climate change, fuel cell technology and increasingly prominent environmental issues have promoted the emergence of "hydrogen energy economy". Replacing or partially replacing the existing energy supply with hydrogen will become the direction of human efforts. At present, hydrogen production from fossil fuels is the main way in industry, and more than 95% of hydrogen in the world is produced from fossil fuels. Although the existing technology for hydrogen productio...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 朱丽萍宋辉李亚光楼子瑞
Owner ZHEJIANG UNIV
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