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Porous carbon supported platinum-cerium oxide catalyst for fuel cell and preparation thereof

A fuel cell and cerium oxide technology, applied in the field of porous carbon-supported platinum-cerium oxide composite catalyst and its preparation, can solve the problems that the catalyst is easily poisoned, can no longer play a catalytic role, lose activity, etc., and achieve excellent anti-poisoning performance, Excellent antioxidant properties, simple preparation process

Inactive Publication Date: 2008-05-28
申靓博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem that the catalyst is easily poisoned is also an important problem hindering the further development of fuel cells.
The gas used in the hydrogen-oxygen (or hydrogen-air) proton exchange membrane fuel cell cannot be 100% pure and clean gas, and there are impurities such as CO, H 2 S, NH 3 etc. Impurities will cause the active component of the catalyst - platinum to be poisoned, thereby losing its activity; in the methanol fuel cell, intermediate products containing carbonyl groups are generated, and the generation of the intermediate is adsorbed on the active component of the catalyst, platinum, so that it cannot be catalyzed again. effect, causing catalyst poisoning
Moreover, since the activity of the catalyst decreases at low temperature, the activity of the catalyst is limited when the fuel cell operates at low temperature

Method used

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  • Porous carbon supported platinum-cerium oxide catalyst for fuel cell and preparation thereof
  • Porous carbon supported platinum-cerium oxide catalyst for fuel cell and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 0.9g porous carbon powder in acetone, concentrated HNO 3 solution, heated to reflux for 1 hour. Filter, wash with deionized water to pH = 6, and dry at a constant temperature of 110°C; place the treated porous carbon powder in a beaker, add isopropanol and water, and then add cerium ammonium nitrate solution (the amount is based on the final cerium oxide accounted for porous carbon powder). 10% of the weight of cerium oxide), fully mixed uniformly in the ultrasonic wave, added excessive sodium hydroxide solution to the system, so that the pH value was 8-9, soaked for 4-6 hours, and suction filtered and washed after the reaction was completed, 80 °C for 12 hours in vacuum, then put the product in a tube furnace and calcined under the protection of N2, and calcined at 300 °C for 3 hours to obtain a porous cerium oxide powder material.

[0025] The obtained cerium oxycarbide material was put into a three-necked flask, and absolute ethanol, water and isopropanol were...

Embodiment 2

[0032] Weigh 0.8g porous carbon powder in acetone, concentrated HNO 3 solution, heated to reflux for 1 hour. Filter, wash with deionized water to pH = 6, and dry at a constant temperature of 100°C; place the treated porous carbon powder in a beaker, add isopropanol and water, and then add cerium ammonium nitrate solution (the amount is based on the final cerium oxide accounted for porous carbon powder). 20% of the weight of cerium oxide), fully mixed uniformly in the ultrasonic wave, added excessive sodium hydroxide solution to the system, so that the pH value was 8-9, soaked for 4-6 hours, and suction filtered and washed after the reaction was completed, 90 ℃ vacuum drying for 11 hours, and then the product was placed in a tube furnace under N 2 Calcination under protection, calcination at 400°C for 2 hours, a porous cerium oxide powder material.

[0033] The platinum loading method is the same as that of embodiment 1, and the platinum loading of the prepared catalyst is 30...

Embodiment 3

[0036] Weigh 0.9g porous carbon powder in acetone, concentrated HNO 3 solution, heated to reflux for 2 hours. Filter, wash with deionized water to pH = 6, and dry at a constant temperature of 120°C; place the treated Vulcan XC-72 carbon powder in a beaker, add isopropanol and water, and then add cerium ammonium nitrate solution (the amount added is based on the final oxidation Cerium accounts for 10% of the weight of cerium oxycarbide), fully mixed uniformly in the ultrasonic wave, and excessive sodium hydroxide solution is added to the system to make the pH value at 8-9, soak for 4-6 hours, and perform suction filtration and washing after the reaction is completed , dried under vacuum at 70°C for 14 hours, and then placed the product in a tube furnace under N 2 Calcination under protection, calcination at 200°C for 4 hours, a porous cerium oxide powder material.

[0037] The platinum loading method is the same as that of embodiment 1, and the platinum loading of the prepare...

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Abstract

The invention relates to a porous carbon load platinum-cerium oxide catalyst for fuel cells and a preparation method. A carrier of the invention is porous carbon, and a catalyst active component is platinum-cerium oxide, wherein, the cerium-oxide amounts to 5-15% of the weight of the porous carbon cerium oxide; the platinum load is 20-30%. The porous carbon load platinum-cerium oxide composite catalyst exhibits more excellent antitoxic performance than general Vulcan XC-72 carbon load platinum catalyst, and can be applied to proton exchange membrane fuel cells which need to enhance antitoxic performance and direct methanol fuel cells.

Description

technical field [0001] The invention relates to a porous carbon-supported platinum-cerium oxide composite catalyst for a proton exchange membrane fuel cell and a preparation method thereof. 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. The carbon carrier has a large specific surface area and rich mesopores. It is a good carrier, which can greatly reduce the use of precious metal platinum and reduce the overall cost of the battery. However, the problem that the catalyst is easily poisoned is also an important problem hindering the further development of fuel cells. The gas used in the hydrogen-oxygen (or hydrogen-air) proton exchange membrane fuel cell cannot be 100% pure and clean gas, and there are impurities such as CO, H 2 S, NH 3 etc. Impurities will cause th...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J21/18H01M4/92
CPCY02E60/50
Inventor 申靓博
Owner 申靓博
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