Platinum-carbon catalyst for hydrogen fuel cell and preparation method of platinum-carbon catalyst

A platinum-carbon catalyst, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large sintering of active component particles, low activity, poor dispersion, etc., to improve electrochemical performance, alleviate The effect of sintering growth and improving dispersion

Active Publication Date: 2021-07-09
SINOCAT ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the impregnation reduction method is easy to operate and has strong universality. However, the preparation of platinum-carbon catalysts by the traditional impregnation method requires high-temperature roasting under reducing gas, which easily leads to the sintering of active component particles and poor dispersion, which eventually leads to partial activity. Low

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  • Platinum-carbon catalyst for hydrogen fuel cell and preparation method of platinum-carbon catalyst
  • Platinum-carbon catalyst for hydrogen fuel cell and preparation method of platinum-carbon catalyst
  • Platinum-carbon catalyst for hydrogen fuel cell and preparation method of platinum-carbon catalyst

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preparation example Construction

[0046] A hydrogen fuel cell platinum-carbon catalyst and a preparation method thereof of the present invention comprise:

[0047] 1. Remove organic impurities

[0048] (1) Washing: Mix the carbon carrier and the organic solvent, and stir mechanically at room temperature for 1 to 5 hours;

[0049] Wherein the mass ratio of the carbon carrier to the organic solvent used is 1:40~1:100;

[0050]Organic solvents include one or more of benzene, toluene, pentane, hexane, octane, cyclohexane, acetone, carbon tetrachloride, methanol, ethanol, isopropanol, dimethylformamide, etc. in any proportion mixture.

[0051] Carbon supports include one or a mixture of two or more of XC-72, XC-72R, Ketjen black series, Black Pearls 2000, acetylene black, graphene, and carbon nanotubes.

[0052] (2) Filtration / rinsing: the mixture in step (1) is filtered, the liquid is drained and rinsed with absolute ethanol several times.

[0053] Among them, the number of rinsing is not less than 3 times.

...

Embodiment 1

[0068] 1. Weigh 2g of original carbon carrier and 100g of acetone, and stir mechanically at room temperature for 5 hours;

[0069] 2. Remove the filtrate from the sample in step 1, rinse it with alcohol several times, and finally put it in an oven at 80°C for 12 hours;

[0070] 3. The dried sample in step 2 is crushed with a crusher;

[0071] 4. Mix 1 g of the carbon carrier obtained in step 3 with 40 g of 2M nitric acid solution, and stir at 60°C for 12 hours;

[0072] 5. Remove the filtrate from the sample in step 4, wash it with deionized water until the filtrate is neutral, and dry it in vacuum at 80°C;

[0073] 6. Take 120 mg of the sample in step 5, stir and ultrasonically disperse it in 12 mL of 1% PVP absolute ethanol solution with a mass fraction of 1% for 30 minutes, and then reflux at 60°C for 5 hours;

[0074] 7. Suction filter the product in step 6, then vacuum dry at 80°C for 12 hours;

[0075] 8. Take 40 mL of platinum nitrate solution with a concentration of...

Embodiment 2

[0079] 1. Weigh 2g of the original carbon carrier and 100g of acetone, and stir mechanically at room temperature for 5 hours;

[0080] 2. Remove the filtrate from the sample in step 1, rinse it with alcohol several times, and finally put it in an oven at 80°C for 12 hours;

[0081] 3. The dried sample in step 2 is crushed with a crusher;

[0082] 4. Mix 1 g of the carbon carrier obtained in step 3 with 40 g of 2M nitric acid solution, and stir at 60°C for 12 hours;

[0083] 5. Remove the filtrate from the sample in step 4, wash it with deionized water until the filtrate is neutral, and dry it in vacuum at 80°C;

[0084] 6. Take 40 mL of platinum nitrate solution with a concentration of 5 mg / ml, and adjust the pH to 3-3.5 with 0.05 M hydrochloric acid solution, then add 4 mg of dopamine and mix and stir for 30 minutes, then add 120 mg of carbon carrier obtained in step 5, and stir mechanically 5 hours, and then 80 ° C rotary evaporation to dryness to remove water and then gro...

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Abstract

The invention discloses a preparation method of a platinum-carbon catalyst for a hydrogen fuel cell. The method comprises the steps of carbon carrier organic impurity removal, carbon carrier pretreatment, carbon carrier surface modification and platinum loading. According to the preparation method disclosed by the invention, PVP is introduced as a carbon carrier modification additive, and dopamine is adopted as a layer-by-layer self-assembly inducer to prepare the platinum-carbon catalyst; in the preparation process, the PVP concentration and the nitric acid solution concentration are accurately controlled, the proper roasting temperature and sequence are selected, the pH range during platinum loading is controlled, and the hydrogen fuel cell platinum-carbon catalyst with better electrochemical performance is prepared; and detection proves that the preparation method can improve the dispersity of precious metal particles, sintering growth of platinum metal nanoparticles is effectively relieved, and the electrochemical performance of the prepared catalyst is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of design and preparation of electrocatalysts, in particular to a method for preparing high-performance electrocatalysts used in high-efficiency and low-precious metal film electrodes of proton exchange membrane fuel cells, and relates to new energy materials and the application field of fuel cell vehicles, in particular to A hydrogen fuel cell platinum carbon catalyst and a preparation method thereof. Background technique [0002] As a green and pollution-free ultimate energy supply system, hydrogen fuel cells have attracted much attention, and have great application prospects in the field of vehicle fuel cells. The sluggish reaction kinetics of the cathodic oxygen reduction reaction leads to a high oxygen reduction overpotential. Therefore, the development of suitable oxygen reduction catalysts is of great significance to promote the application of hydrogen fuel cells. At present, most catalysts for hydr...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/9058H01M4/926H01M4/9083H01M4/8817Y02E60/50
Inventor 王正罗曾程宋晨辉乔红艳陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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