Fuel cell catalyst with nanographite carbon rivet structure and preparation method thereof

A nano-graphite and fuel cell technology, applied in fuel cells, battery electrodes, structural parts, etc., to achieve good stability, reduce migration and agglomeration, and simple preparation methods

Inactive Publication Date: 2017-12-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the synthesis of high-performance fuel cell catalysts with nano-graphite carbon rivets by chemical vapor deposition.

Method used

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  • Fuel cell catalyst with nanographite carbon rivet structure and preparation method thereof
  • Fuel cell catalyst with nanographite carbon rivet structure and preparation method thereof
  • Fuel cell catalyst with nanographite carbon rivet structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 50mg, 37% Pt / C catalyst in a small porcelain boat, shake the small porcelain boat, so that the sample is evenly spread in the small porcelain boat, slowly put the small porcelain boat containing the sample into the quartz tube resistor central position of the furnace;

[0035] Seal the experimental device with silica gel, check the airtightness to ensure good;

[0036] Infuse high-purity argon for 1 hour at room temperature to remove the air in the device;

[0037] In a high-purity argon atmosphere, heat up to 80°C at a rate of 5°C / min, hold for 2 hours, and remove the moisture in the sample;

[0038] Raise the temperature to 700°C at 10°C / min. After the temperature is constant, turn off the high-purity argon gas, and feed C at a flow rate of 15ml / min. 2 h 2 Gas, time 10s;

[0039] After the reaction was completed, the acetylene gas valve was slowly closed and high-purity argon gas was introduced, and the temperature was kept for 30 minutes until the temperature...

Embodiment 2

[0062] Weigh 50mg, 37% Ru / C catalyst in a small porcelain boat, shake the small porcelain boat, so that the sample is evenly spread in the small porcelain boat, slowly put the small porcelain boat with the sample into the quartz tube resistor central position of the furnace;

[0063] Seal the experimental device with silica gel, check the airtightness to ensure good;

[0064] Inject high-purity nitrogen gas at room temperature for 1 hour to remove the air in the device;

[0065] In a high-purity nitrogen atmosphere, heat up to 100°C at a rate of 5°C / min and hold for 2 hours to remove the moisture in the sample;

[0066] Raise the temperature to 750°C at 10°C / min. After the temperature is constant, turn off the high-purity nitrogen gas and feed in methane gas at 8ml / min for 30s;

[0067] After the reaction was completed, the methane gas valve was slowly closed and high-purity nitrogen gas was introduced, and the temperature was kept for 45 minutes until the temperature droppe...

Embodiment 3

[0072] Weigh 50mg, 37% Pd / C catalyst in a small porcelain boat, shake the small porcelain boat, so that the sample is evenly spread in the small porcelain boat, slowly put the small porcelain boat containing the sample into the quartz tube resistor central position of the furnace;

[0073] Seal the experimental device with silica gel, check the airtightness to ensure good;

[0074] Infuse high-purity argon for 1 hour at room temperature to remove the air in the device;

[0075] In a high-purity argon atmosphere, heat up to 120°C at a rate of 8°C / min, hold for 1 hour, and remove the moisture in the sample;

[0076] Raise the temperature to 600°C at 10°C / min. After the temperature is constant, turn off the high-purity argon gas and feed in ethane gas at a flow rate of 10ml / min for 20s;

[0077] After the reaction was completed, the ethane gas valve was slowly closed and high-purity argon gas was introduced, and the temperature was kept for 1 h until the temperature dropped to ...

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Abstract

The invention relates to a fuel-cell catalyst with a nano-graphite carbon rivet structure and a preparation method of the fuel-cell catalyst. Nano-graphite carbon with a graphite or graphite-like structure is introduced into a carbon carrier-loaded metal active component catalyst to form the fuel-cell catalyst with the nano-graphite carbon rivet structure; and the nano-graphite carbon rivet structure is the structure which is formed by covering the surfaces of metal particles with the nano-graphite carbon with the graphite or graphite-like structure and combining with a metal particle-loaded carbon carrier. Migrating agglomeration of catalyst particles on the carrier surface can be effectively suppressed; the service life of the catalyst is prolonged; and meanwhile, small particles which are formed by dissolving and redepositing the catalyst particles directly enter the solution in general in an electrochemical environment. The catalyst has the graphite carbon rivet structure, so that redeposited small particles can be deposited on a graphite carbon layer for further catalytic reaction; the redeposited particles are small in particle size and large in specific surface area; and the fuel-cell catalyst has more excellent catalytic activity than an ordinary carbon-loaded metal catalyst.

Description

technical field [0001] The invention relates to a novel high-performance fuel cell catalyst and a preparation method thereof, belonging to the technical field of fuel cells. Background technique [0002] Due to its high efficiency, zero pollution, and fast start-up, fuel cells are considered to be a potential electrical energy storage and conversion device in the future. Carbon-supported nano-sized Pt or Pt alloy catalysts are widely used in the cathode and anode of fuel cells. So far, carbon materials such as carbon black, carbon nanotubes, carbon nanowires, and graphene are still widely used as fuel cell catalyst supports due to their large specific surface area, high electrical conductivity, and excellent pore structure. However, the catalyst activity and stability have greatly hindered the commercialization of fuel cells. Early studies have shown that after a certain period of operation of fuel cells under certain conditions, the performance of the fuel cell decreases ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/90H01M4/9083H01M8/00Y02E60/50
Inventor 木士春寇宗魁李文强张杰孙镕慧孟天
Owner WUHAN UNIV OF TECH
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