Platinum/carbon aerogel catalyst used for fuel cells and preparation method thereof

A carbon aerogel and fuel cell technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of large catalyst particles, cumbersome operation steps, and long preparation time, and achieve uniform distribution, simple preparation process, and short preparation time The effect of shortening

Inactive Publication Date: 2010-06-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This traditional preparation method of Pt / carbon airgel catalyst mostly adopts liquid phase reduction of formaldehyde multi-chemical agent, and the prepared catalyst particles are large and easy to agglomerate; or adopts ethylene glycol oil bath reduction, which has long preparation time and cumbersome operation steps Defects

Method used

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  • Platinum/carbon aerogel catalyst used for fuel cells and preparation method thereof
  • Platinum/carbon aerogel catalyst used for fuel cells and preparation method thereof
  • Platinum/carbon aerogel catalyst used for fuel cells and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] ① Add resorcinol, formaldehyde, and catalyst anhydrous sodium carbonate with a molar ratio of 1:2:200 into the secondary deionized water, mix and stir evenly, place in a closed container, and stand at 85°C for 7 days. Obtain organic airgel; Resorcinol and formaldehyde weight account for 20% of total solution weight;

[0034] ②Put the organic airgel obtained in step ① into an acetic acid solution with a volume fraction of 2%. The acetic acid solution can be immersed in the organic aerogel. Place it for 3 days, take it out, and place it in acetone (analytical pure) for 3 days. Acetone is replaced once a day, taken out, placed in the air to dry, ground into powder (particle size is 20-30nm), to obtain carbon airgel powder; its physical parameters are: specific surface area 1000m 2 / g, pore size distribution 2-50nm, density distribution 1.0g / cm 3 , Conductivity -40s / cm.

[0035] ③The carbon airgel powder prepared in step ② is slowly heated to 250°C for 2 hours in a nitrog...

Embodiment 2

[0043] Preparation method of carbon airgel:

[0044] ① Add resorcinol, formaldehyde, and catalyst ammonium bicarbonate with a molar ratio of 1:1:100 into secondary deionized water, mix and stir evenly, place in an airtight container, and stand at 90°C for 4 days to obtain Organic airgel; the weight of resorcinol and formaldehyde accounts for 30% of the total solution weight;

[0045] ②Put the organic aerogel obtained in step ① into an acetic acid solution with a volume fraction of 1%, place it for 2 days, take it out, place it in an acetone solution for 4 days, replace the acetone once a day, take it out, dry it in the air, and grind it into powder to obtain carbon airgel powder; its physical parameters are: specific surface area 500m 2 / g, pore size distribution 2-50nm, density distribution 0.4g / cm 3 , Conductivity -40s / cm.

[0046] ③Use the carbon airgel powder prepared in step ② to slowly heat up to 300°C for 1 hour in an atmosphere of helium protection gas, maintain it ...

Embodiment 3

[0051] Preparation method of carbon airgel:

[0052] ① Add resorcinol, formaldehyde, and catalyst ammonium carbonate with a molar ratio of 1:1.5:1500 into secondary deionized water, mix and stir evenly, place in a closed container, and stand at 80°C for 3 days to obtain organic Airgel; resorcinol and formaldehyde weight account for 60% of the total solution weight;

[0053] ②Put the organic airgel obtained in step ① into the acetic acid solution with a volume fraction of 3%, place it for 1 day, take it out, place it in the acetone solution for 2 days, replace the acetone once a day, take it out, dry it in the air, and grind it into powder to obtain carbon airgel powder; its physical parameters are: specific surface area 1500m 2 / g, pore size distribution 2-50nm, density distribution 0.6g / cm 3 , Conductivity -40s / cm.

[0054] ③Use the carbon airgel powder prepared in step ② to slowly heat up to 200°C for 1.5 hours in an argon protective gas atmosphere and maintain it for 2.5...

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Abstract

The invention relates to a platinum / carbon aerogel catalyst used for fuel cells and a preparation method thereof. A catalyst carrier is carbon aerogel, the active component is platinum, and the platinum carrying capacity is 15-60wt%. The preparation method comprises the following steps: dispersing the carbon aerogel to ethylene glycol solution, adding ethylene glycol solution of chloroplatinic acid, wherein, the chloroplatinic acid accounts for 15-60% of the weight of the carbon aerogel in terms of the platinum; adjusting the pH value of the solution to be 8-12; heating mixed liquor by a batch-type microwave oven; filtering, washing until Cl- does not exist; drying filter cakes at the temperature of 60-90 DEG C for 10-24h to obtain the platinum / carbon aerogel catalyst used for fuel cells.The platinum / carbon aerogel catalyst used for fuel cells prepared by the invention has evenly distributed carbon ions, fine particles and simple preparation process.

Description

technical field [0001] The invention relates to a fuel cell catalyst and a preparation method thereof, in particular to a fuel cell platinum (Pt) / carbon airgel catalyst and a preparation method thereof, belonging to the field of fuel cells. Background technique [0002] Most of the existing proton exchange membrane fuel cell technologies use carbon powder as a carrier, and platinum particles are loaded on the surface of the carbon powder to obtain a supported carbon-supported platinum catalyst. However, Pt particles, the active component of the catalyst, are easy to gather, which reduces the performance of the catalyst and the utilization rate of Pt of the catalyst. Carbon airgel is an amorphous carbon material with a three-dimensional nano-network structure, which is generally obtained from formaldehyde and phenols through a sol-gel process, followed by solvent replacement, drying and high-temperature carbonization. Carbon airgel has low density, high porosity and high spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92C01B31/02
CPCY02E60/50
Inventor 朱红郭志军张新卫
Owner BEIJING UNIV OF CHEM TECH
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