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Preparation method of fuel cell catalyst

A fuel cell and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve problems such as battery voltage drop, catalyst carrier carbon material corrosion speed acceleration, etc.

Inactive Publication Date: 2014-07-23
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the moment of starting or shutting down, the cathode electrode will be temporarily at a high potential of 1.2 ~ 1.5 V. Under this instantaneous high potential, the corrosion rate of the catalyst carrier carbon material will be further accelerated, which will also cause a significant drop in the voltage provided by the battery.

Method used

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  • Preparation method of fuel cell catalyst
  • Preparation method of fuel cell catalyst
  • Preparation method of fuel cell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 5g of nano-diamond with an average particle size of 50nm and put it into the crucible, then put the crucible into the vacuum furnace, and vacuumize it to reach 10 -3 Pa; then heated to 1200 °C, kept at a constant temperature for 3 h, and cooled to room temperature naturally under the condition of maintaining a vacuum environment to obtain a graphite-diamond carrier with a core-shell structure.

[0025] Take 40 mg of the above graphitized nanodiamonds, add them to a beaker containing 5 mL of chloroplatinic acid (concentration of 0.055 mol / L) and 50 mL of ethylene glycol, ultrasonically vibrate for 30 min, the vibration frequency is 20 kHz, and the power is 100 W. A suspension is formed. The beaker containing the above suspension was placed in a microwave oven and heated for 60 s at a microwave frequency of 2.45 GHz and an output power of 800 W. The beaker was taken out from the microwave oven, air-cooled to room temperature, washed three times with acetone, washed ...

Embodiment 2

[0030] Take 5g of nano-diamond with an average particle size of 250nm and put it into a crucible, then put the crucible into a vacuum furnace, and evacuate to 10 -3 Pa; then heated to 1500° C., held at a constant temperature for 1 h, and cooled to room temperature naturally under the condition of maintaining a vacuum environment, to obtain a graphite-diamond carrier with a core-shell structure.

[0031] Take 5.5mg of the above graphitized nano-diamond, add it to a beaker containing 5ml of chloroplatinic acid aqueous solution with a concentration of 0.01mol / L and 50ml of ethylene glycol, ultrasonically oscillate for 30min, the vibration frequency is 20kHz, and the power is 100W. suspension. The beaker containing the above suspension was placed in a microwave oven at 80% power for intermittent heating for 60 s, the microwave frequency was 2.45 GHz, and the output power was 800 W. The beaker was taken out from the microwave oven, air-cooled to room temperature, washed three time...

Embodiment 3

[0035] Take 3g of nano-diamond with an average particle size of 5nm and put it into a crucible, then put the crucible into a vacuum furnace, and vacuumize to 10 -5 Pa vacuum environment; then heated to 1100 ° C, constant temperature for 1 hour, and naturally cooled to room temperature under the condition of maintaining a vacuum environment, the graphite-diamond carrier with a core-shell structure was obtained.

[0036] Take 30mg of the above graphitized nano-diamonds, add it to a beaker containing 5ml of chloroplatinic acid aqueous solution with a concentration of 0.05mol / L and 50ml of ethylene glycol, ultrasonically vibrate for 30min, the vibration frequency is 20kHz, and the power is 100W, uniformly dispersed to form a suspension liquid. The beaker containing the above suspension was heated in a microwave oven for 30 s, the microwave frequency was 2.45 GHz, and the output power was 800 W. The beaker was taken out from the microwave oven, air-cooled to room temperature, wash...

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Abstract

The invention relates to a preparation method of a fuel cell catalyst, which mainly comprises the following steps that: nano-diamond is placed into a crucible, and then placed in a vacuum furnace to be heated to 800 to 1800 DEG C, the temperature is kept for 0.5 to 3 hours, and then the nano-diamond is naturally cooled to room temperature to obtain graphitized nano-diamond; the graphitized nano-diamond, chloroplatinic acid, and ethylene glycol are placed into a beaker, and are subjected to ultrasonic oscillation for 30min to form a suspension; and the beaker filled with the suspension is placed into a microwave to be heated for 30 to 300s and then the beaker is taken out and is cooled to room temperature, and then the suspension is washed with acetone for three times and washed with deionized water for three times, and are dried at room temperature to obtain platinum catalyst powder taking graphitized nano-diamond as a carrier. The invention provides the carrier of the fuel cell catalyst with a core with extremely high thermal and chemical stability, and meanwhile, a graphite layer on the surface allows the carrier of the catalyst not to affect the catalytic activity of the catalyst due to poor electrical conductivity of the nano-diamond, and the degradation of a carrier structure and morphology does not easily occur.

Description

technical field [0001] The present invention relates to a preparation method of a catalyst, in particular to a preparation method of a fuel cell catalyst. Background technique [0002] A fuel cell (FC) is a device that directly converts the chemical energy of a fuel into usable electricity and heat without going through a combustion process. Its working method is similar to a battery, but it does not need to be charged and will not be exhausted. As long as the sufficient supply of fuel is ensured, electricity and heat will be continuously generated. It is a high-efficiency and clean new energy source. The fourth type of power generation technology after that will shoulder the heavy responsibility of energy innovation and breakthrough in the 21st century. [0003] Traditional direct fuel cells use platinum-based catalysts, and in order to improve the dispersion of precious metal platinum and thus improve its utilization, we need to support platinum on a certain carrier. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42H01M4/92
CPCY02E60/50
Inventor 臧建兵赵玉玲王艳辉
Owner YANSHAN UNIV