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Method for preparing titanium tungsten oxide coated carbon nano-tube platinum-supported electro-catalyst

A carbon nanotube and electrocatalyst technology, which is applied in the field of preparation of titanium tungsten oxide-coated carbon nanotube-supported platinum electrocatalyst, can solve the problems of poor stability and activity, and achieves improved activity, simple operation process, and reduced production. rate effect

Inactive Publication Date: 2013-11-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a titanium-tungsten oxide-coated carbon nanotube-supported platinum electrocatalyst for the disadvantages of poor stability and activity of the existing fuel cell cathode catalyst

Method used

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  • Method for preparing titanium tungsten oxide coated carbon nano-tube platinum-supported electro-catalyst
  • Method for preparing titanium tungsten oxide coated carbon nano-tube platinum-supported electro-catalyst
  • Method for preparing titanium tungsten oxide coated carbon nano-tube platinum-supported electro-catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Purification of carbon nanotubes

[0032] Weigh 1 gram of commercially available carbon nanotubes, add 160 milliliters of concentrated nitric acid, heat and reflux for 3 hours, cool, dilute with ultrapure water, filter out the supernatant, centrifuge for many times, dry, and grind to obtain purified carbon nanotubes Tube.

[0033] (2) Preparation of titanium-tungsten oxide-coated carbon nanotubes

[0034] The mass ratio of the purified carbon nanotubes obtained in step (1): butyl titanate: sodium tungstate is 1: 2.5: 1. Weigh the purified carbon nanotubes, butyl titanate and sodium tungstate respectively; The volume ratio of ethanol:ammonia water:hydrogen peroxide solution is 1:0.2:0.008 Measure absolute ethanol, ammonia water and hydrogen peroxide solution respectively, wherein, the mass concentration of ammonia water is 28%, the mass concentration of hydrogen peroxide solution is 30% %; Disperse the purified carbon nanotubes obtained in step (1) in absolute etha...

Embodiment 2

[0038] Step (1) is the same as step (1) in Example 1.

[0039] (2) Preparation of titanium-tungsten oxide-coated carbon nanotubes

[0040] The mass ratio of the purified carbon nanotubes obtained in step (1): titanium isopropoxide: ammonium tungstate is 1: 1: 0.5 and the purified carbon nanotubes, titanium isopropoxide and ammonium tungstate are weighed respectively; The volume ratio of ethanol:ammonia water:hydrogen peroxide solution is 1:0.1:0.004 Measure absolute ethanol, ammonia water and hydrogen peroxide solution respectively, wherein the mass concentration of ammonia water is 28%, and the mass concentration of hydrogen peroxide solution is 30% %; Disperse the purified carbon nanotubes obtained in step (1) in absolute ethanol, then slowly add titanium isopropoxide, and stir ultrasonically for 20 minutes to obtain a carbon nanotube titanium isopropoxide dispersion; dissolve ammonium tungstate In ammonia water, slowly add hydrogen peroxide solution, ultrasonically oscilla...

Embodiment 3

[0046] Step (1) is the same as step (1) in Example 1.

[0047] (2) Preparation of titanium-tungsten oxide-coated carbon nanotubes

[0048] The mass ratio of the purified carbon nanotubes obtained in step (1): titanium acetylacetonate: ammonium paratungstate is 1: 4: 2. Weigh the purified carbon nanotubes, titanium acetylacetonate and ammonium paratungstate respectively; according to absolute ethanol: ammonia water: peroxide The volume ratio of hydrogen solution is 1: 0.4: 0.016 to measure dehydrated alcohol, ammoniacal liquor and hydrogen peroxide solution respectively, wherein, the mass concentration of ammoniacal liquor is 28%, and the mass concentration of hydrogen peroxide solution is 30%; Step (1 ) The obtained purified carbon nanotubes were dispersed in absolute ethanol, then slowly added titanium acetylacetonate, and stirred ultrasonically for 60 minutes to obtain a dispersion of carbon nanotube titanium acetylacetonate; dissolved ammonium paratungstate in ammonia water...

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Abstract

The invention provides a method for preparing a titanium tungsten oxide coated carbon nano-tube platinum-supported electro-catalyst, belonging to the technical field of fuel cells. According to the method, titanium tungsten oxides are uniformly coated on the surfaces of carbon nano-tubes by adopting a sol-gel method, and titanium tungsten oxide coating layers with high crystallinity and high conductivity are formed through heat treatment so as to support a platinum catalyst. On one hand, the highly-crystalline titanium tungsten oxides are uniformly coated on the carbon nano-tubes, so that electron transmission channels are constructed, the conductivity is enhanced, the corrosion to a support is avoided effectively, the loss of the catalyst is inhibited, and the activity, stability and platinum utilization rate of the catalyst are improved greatly. On the other hand, the decomposition of an intermediate product, namely hydrogen peroxide, of oxygen reduction is accelerated by the titanium tungsten oxide coating layers, so that the yield of hydrogen peroxide is reduced, the influence on the catalyst and electrolyte membranes caused by hydrogen peroxide is reduced, and then, the service life of a fuel cell system is prolonged. The method provided by the invention has the advantages that the method is simple, the industrial production is facilitated, and the prepared catalyst can be applied to the fuel cells which take proton exchange membranes as electrolytes.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a preparation method of a titanium-tungsten oxide-coated carbon nanotube-supported platinum electrocatalyst. Background technique [0002] A fuel cell is a device that directly converts chemical energy into electrical energy. It has outstanding features such as high energy conversion efficiency, environmental friendliness, low operating temperature, low-temperature fast start-up, high specific power and specific energy, and is considered to be the most promising chemical power source for electric vehicles and other civilian applications in the future. Carbon-supported platinum catalysts have outstanding catalytic activity and are regarded as ideal fuel cell catalysts. However, the interaction between the carbon support and platinum is weak, and the carbon support is prone to corrosion. Nano-platinum particles are easy to migrate on the surface of the support, aggl...

Claims

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Application Information

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IPC IPC(8): B01J23/652B01J32/00H01M4/88H01M4/86H01M4/92
CPCY02E60/50
Inventor 魏子栋汪虹敏陈四国丁炜张薇薇王紫娟
Owner CHONGQING UNIV
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