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Polyaniline-coated carbon carrier-containing platinum-based dealloying fuel cell catalyst, and preparation method therefor

A fuel cell and polyaniline technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as carbon carrier damage, unfavorable catalyst life, etc., to reduce damage, improve atomic utilization, improve catalytic efficiency and the utilization of precious metals rate effect

Active Publication Date: 2017-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of strong acid treatment, the carbon carrier will be damaged, which is not conducive to the life of the catalyst.

Method used

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  • Polyaniline-coated carbon carrier-containing platinum-based dealloying fuel cell catalyst, and preparation method therefor
  • Polyaniline-coated carbon carrier-containing platinum-based dealloying fuel cell catalyst, and preparation method therefor
  • Polyaniline-coated carbon carrier-containing platinum-based dealloying fuel cell catalyst, and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Weigh 2g carbon (carbon black) carrier and disperse in 200ml concentrated HNO 3 , heated in an oil bath at 130°C for 0.5h, poured into deionized water to cool and dilute, then filtered and washed, dried in a vacuum oven at 60°C, and ground into powder for later use;

[0044] (2) Preparation of carbon-polyaniline: take by weighing 0.2g of carbon powder obtained in step (2), and evenly disperse it in 40ml 1mol / LHClO 4 In the solution, add 20ml of an aqueous solution containing 0.1-0.4g of aniline under ice-bath conditions, and stir magnetically; dissolve 0.2450-0.98g of ammonium persulfate (APS) in 1mol / L HClO 4 solution (the molar ratio of aniline to ammonium persulfate is 1:1), slowly drop into the reaction system, and react at 0°C for 10h. Synthesize carbon-polyaniline composite carrier (C-PANI) with a mass ratio of 1:0.5 to 1:2 of carbon:polyaniline (C:PANI) according to the above steps;

[0045] (3) Weigh 80 mg of the carbon-polyaniline composite carrier obtain...

Embodiment 2

[0052] (1) Weigh 2g carbon (amorphous carbon) carrier and disperse in 200ml concentrated HNO 3 , heated in an oil bath at 130°C for 0.5h, poured into deionized water to cool and dilute, then filtered and washed, dried in a vacuum oven at 60°C, and ground into powder for later use;

[0053] (2) Preparation of carbon-polyaniline: take by weighing step (1) gained carbon powder 0.2g, the concentration that is uniformly dispersed in 40ml is the HClO of 1mol / L 4 In the solution, add 20ml of an aqueous solution containing 0.1-0.4g of aniline under ice-bath conditions, stir magnetically, and dissolve 0.2450-0.98g of ammonium persulfate (APS) in 1mol / L of HClO 4 solution (the molar ratio of aniline to ammonium persulfate is 1:1), slowly drop into the reaction system, and react at 0°C for 10h. Synthesize C:PANI mass ratio as above-mentioned carbon-polyaniline composite carrier (C-PANI) of 1:0.5~1:2;

[0054] (3) Weigh 80 mg of the carbon-polyaniline composite carrier obtained in step ...

Embodiment 3

[0057] (1) Weigh 2g carbon carrier and disperse in 200ml concentrated HNO 3 , heated in an oil bath at 130°C for 0.5h, poured into deionized water to cool and dilute, then filtered and washed, dried in a vacuum oven at 60°C, and ground into powder for later use;

[0058] (2) Preparation of carbon-polyaniline: take by weighing step (1) gained carbon powder 0.2g, be evenly dispersed in the HClO of 1mol / L of 40ml 4 In the solution, under ice-bath conditions, add 20ml of an aqueous solution containing 0.1-0.4g aniline, stir magnetically, and dissolve 0.2450-0.98g ammonium persulfate (APS) in 1mol / L HClO4 solution (the moles of aniline and ammonium persulfate The ratio is 1:1), slowly drop into the reaction system, and react at 0°C for 10h. After the reaction, wash, filter and dry, grind into powder, and dry at 80°C for 1h. The mass ratio of C:PANI synthesized according to the above steps is 1:0.5~1:2 carbon-polyaniline composite carrier (C-PANI);

[0059] (3) Weigh 80 mg of the ...

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Abstract

The invention discloses a polyaniline-coated carbon carrier-containing platinum-based dealloying fuel cell catalyst, and belongs to the technical filed of a catalyst of a fuel cell. The platinum-based dealloying fuel cell catalyst comprises the carrier and an active ingredient; the carrier is formed by coating carbon black with polyaniline; the active ingredient is platinum-cobalt metal with a core-shell structure, wherein platinum-cobalt alloy is taken as the core while platinum is taken as the shell; the polyaniline-coated carbon black carrier is 60-80wt%; the platinum-cobalt metal with the core-shell structure is 20-40wt%; and in the core of the platinum-cobalt alloy, the atomic ratio of platinum to cobalt is 1:0.5 to 1:3. According to the polyaniline-coated carbon carrier-containing platinum-based dealloying fuel cell catalyst, the carrier is coated with polyaniline, so that damage to the carbon carrier by acid in the dealloying process can be effectively lowered; in the subsequent use process of the catalyst, polyaniline is oxidized prior to the carbon carrier, so that the service life of the dealloying catalyst can be prolonged; and the catalytic efficiency of the catalyst and the utilization rate of noble metals can be greatly improved, so that development of the fuel cell can be promoted.

Description

technical field [0001] The invention relates to a fuel cell catalyst and a preparation method thereof, in particular to a polyaniline-coated carbon carrier platinum-based dealloyed fuel cell catalyst and a preparation method thereof, belonging to the technical field of fuel cell catalysts. [0002] technical background [0003] Fuel cells generally use hydrogen as fuel, and their cathode catalysts are mainly platinum-based catalysts. However, platinum resources are limited and expensive, which hinders the marketization of fuel cells. [0004] The core-shell nanostructure catalyst is that one metal nanoparticle is coated on the outer layer of another metal nanoparticle, and the two are connected together by chemical bonds or other forces. In addition to its own properties when several metal particles exist alone, it also has some new characteristics produced by combining multiple metals, and its catalytic activity is better than that of a single metal particle. Using a relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/88H01M4/926Y02E60/50
Inventor 朱红刘阳王芳辉
Owner BEIJING UNIV OF CHEM TECH