Electric catalyst with conducing high polymer modification one-dimensional nano carbon as carrier and producing process

A technology of conductive high polymer and electrocatalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., can solve the problem of poor bonding strength between metal particles and one-dimensional nano-carbon, and achieve good bonding force Effect

Inactive Publication Date: 2005-09-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The use of conductive polymers with large π-bond structures to modify one-dimensional nanocarbons is mainly to use the π-π bonding effect of conductive polymers and one-dimensional nanocarbons to make the two closely combined, and at the same time, the catalytic metal particles in the catalyst The binding force with conductive polymers is also stronger than that with one-dimensional nanocarbons, thus solving the problem of poor binding strength between metal particles and one-dimensional nanocarbons in catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 0.25g of multi-walled carbon nanotubes, add them to the mixed solution of 20ml ethanol and water (the mass ratio of ethanol and water is 1:1), disperse by ultrasonic (R-S150 ultrasonic cell pulverizer) for 5-20 minutes, then add 90wt% aniline solution, the mass ratio of carbon nanotubes to aniline is 0.6:1, fully stir, add 2g of ammonium persulfate and 20ml of hydrochloric acid solution with a concentration of 1mol / l, continue to stir and react at 0°C for 8 hours, filter , washed with ethanol for 2 to 3 times to prepare polyaniline-modified carbon nanotubes. The prepared polyaniline-modified carbon nanotubes were dispersed in a mixed solution of 220ml ethanol and water (the mass ratio of ethanol and water was 1: 1), adding Pt concentration was 28ml of chloroplatinic acid solution of 0.046mol / l, aniline The mass ratio to platinum is 1.7:1, fully stirred, and N 2 , heated to reflux at 90°C, stopped heating after 8 minutes of reaction, but continued to feed N 2 The ...

Embodiment 2

[0032] Take 0.25g of multi-walled carbon nanotubes, add them to the mixed solution of 20ml ethanol and water (the mass ratio of ethanol and water is 100:1), disperse by ultrasonic (R-S150 ultrasonic cell pulverizer) for 5-20 minutes, then add 90wt% aniline solution, the mass ratio of carbon nanotubes to aniline is 0.6:1, fully stir, add 2g of ammonium persulfate and 20ml of hydrochloric acid solution with a concentration of 1mol / l, continue to stir and react at 0°C for 8 hours, filter , washed with ethanol for 2 to 3 times to prepare polyaniline-modified carbon nanotubes. The prepared polyaniline-modified carbon nanotubes were dispersed in a mixed solution of 220ml ethanol and water (the mass ratio of ethanol and water was 100:1), and 28 ml of chloroplatinic acid solution with a Pt concentration of 0.046mol / l was added, The mass ratio of aniline to platinum is 1.7:1, fully stirred, and N 2 , heated to reflux at 90°C, stopped heating after 1 minute of reaction, but continued t...

Embodiment 3

[0034] Get 0.75g of multi-walled carbon nanotubes, add them to the mixed solution of 30ml ethanol and water (the mass ratio of ethanol and water is 1.4:1), and disperse by ultrasonic (R-S150 ultrasonic cell pulverizer) for 5-20 minutes, Add 95wt% pyrrole solution, the mass ratio of carbon nanotubes to pyrrole is 0.5:1, fully stir, add 3.2g of ammonium persulfate and 32ml of nitric acid solution with a concentration of 1mol / l, and continue to stir and react at 0°C for 8 hours, After filtering, washing with ethanol for 2 to 3 times, the polypyrrole-modified carbon nanotube is prepared. The prepared polypyrrole-modified carbon nanotubes were dispersed in a mixed solution of 355ml ethanol and water (the mass ratio of ethanol and water was 1.4: 1), adding Pt concentration was 84ml of chloroplatinic acid solution of 0.046mol / l, pyrrole The mass ratio to platinum is 2:1, fully stirred, and N 2 , heated to reflux at 90°C, stopped heating after 8 minutes of reaction, but continued to ...

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Abstract

An electro - catalyst uses one - dimensional nanocarbon modified by conduction high polymer in large Pi bond structure as carrier. Its preparing process includes preparing one - dimensional nanocarbon modified by conduction high polymer first and then loading Pt or Pt alloy on its surface. The average particle diameter of electro - catalyst is less than or equal to 5 nm and power density of single cell prepared by electro - catalyst is 0.40 - 0.47 W / cm2 under test condition as H2 / Air and Pt loading capacity in 0.20mg / sq cm and 600 mA / sq.cm.

Description

technical field [0001] The invention relates to an electrocatalyst mainly used in the field of fuel cells, especially an electrocatalyst suitable for proton exchange membrane fuel cells, which is characterized in that the carrier in the electrocatalyst is one-dimensional nano-carbon modified by conductive high polymer. The invention also relates to a preparation method of the electrocatalyst. Background technique [0002] Energy issues and environmental issues are becoming more and more prominent with the rapid development of the world economy. In contrast, fuel cells that use hydrogen as fuel do not pollute the environment at all, and also have the advantage of recycling, which has aroused the interest of many researchers. The noble metal in fuel cell electrocatalysts is usually platinum or platinum alloys, because platinum has high catalytic efficiency; while the carrier in fuel cell electrocatalysts is mostly carbon black, because carbon black has a high specific surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J32/00B01J37/00H01M4/92
CPCY02E60/50
Inventor 木士春许程赵培唐浩林潘牧袁润章
Owner WUHAN UNIV OF TECH
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