Pretreatment method of carbon carrier for battery catalyst and carbon carrier

A carbon carrier and catalyst technology, which is applied in the field of hydrogen fuel cell material preparation, can solve the problems of carbon carrier structure damage, influence on carbon carrier electron transport characteristics and strength, and carbon carrier, so as to reduce washing time and deionized water consumption , high efficiency effect

Active Publication Date: 2021-02-05
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing acid treatment method, due to the strong oxidizing ability of high-concentration oxidizing acid, it is easy to over-oxidize the carbon carrier, resulting in the formation of too many defects on the surface of the carbon carrier, which affects the electron transport characteristics and strength of the carbon carrier; secondly, high temperature , Pickling under high pressure conditions can also easily lead to the destruction of the carbon support structure

Method used

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  • Pretreatment method of carbon carrier for battery catalyst and carbon carrier
  • Pretreatment method of carbon carrier for battery catalyst and carbon carrier
  • Pretreatment method of carbon carrier for battery catalyst and carbon carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Take 2g of original carbon carrier directly and crush it with a crusher.

[0053] 2. Directly take the broken original carbon carrier in step 1 and mix with an appropriate amount of chloroplatinic acid solution, stir and disperse for 60 minutes, then vacuum dry for 12 hours, and finally grind the dried sample into powder, and mix it in 3% nitrogen / hydrogen The catalyst was prepared by calcining at 400°C for 2 hours in air. The platinum metal loading in the catalyst was 40%.

[0054] 3. Weigh 7.6 mg of the catalyst obtained in step 2, add 7 milliliters of ultrapure water and 3 milliliters of isopropanol to it successively, disperse evenly by ultrasonic vibration for 30 minutes, and then add 40 microliters of Nafion membrane solution (mass. Fraction 5%, DuPont), and then ultrasonically shake in ice water for 10 minutes. Use a microsampler to draw 6.5 microliters and evenly coat it on a glassy carbon rotating disk electrode (inner core diameter: 5 mm), and spin dry in...

Embodiment 2

[0056] 1. Weigh 2g of original carbon carrier and 24g of acetone, and stir mechanically at room temperature for 5 hours;

[0057] 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;

[0058] 3. The dried sample in step 2 is crushed with a crusher;

[0059] 4. Directly take the broken carbon carrier in step 3 and mix it with an appropriate amount of chloroplatinic acid solution, stir and disperse for 60 minutes, then dry it in vacuum for 12 hours, and finally grind the dried sample into powder. The catalyst was prepared by calcining at 400°C for 2 hours. The platinum metal loading in the catalyst was 40%.

[0060] 5. Weigh 7.6 mg of the catalyst obtained in step 4, add 7 milliliters of ultrapure water and 3 milliliters of isopropanol to it successively, disperse evenly by ultrasonic vibration for 30 minutes, and then add 40 microliters of Nafion membrane solution (mass. Fraction 5%, DuPont...

Embodiment 3

[0062] 1. Take 2g of original carbon carrier directly and crush it with a crusher.

[0063] 2. Mix 1 g of the carbon carrier obtained in step 1 with 80 g of 0.5 M nitric acid solution, and stir at 60 ° C for 12 hours;

[0064] 3. Remove the filtrate from the sample in step 2, and wash it once with deionized water;

[0065] 4. Disperse the sample in step 3 in 60g of water and stir it mechanically for 30 minutes;

[0066] 5. Continuously feed NH into step 4 3 30 minutes to saturation, keep stirring during gas introduction;

[0067] 6. Pyrolyze the carbon carrier suspension obtained in step 5 at 200° C. for 10 minutes under vacuum. Then continue vacuum drying at 70° C. for 12 hours.

[0068] 7. Mix the dried powder in step 6 with an appropriate amount of chloroplatinic acid solution, stir and disperse for 60 minutes, then vacuum-dry for 12 hours, and finally grind the dried sample into powder, and bake it in 3% nitrogen / hydrogen mixed gas at 400°C The catalyst can be obtain...

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Abstract

The invention discloses a pretreatment method of a carbon carrier for a battery catalyst and the carbon carrier. The preparation method comprises the following steps: washing a carbon carrier with anorganic solvent, filtering and rinsing the carbon carrier, drying and crushing the carbon carrier, carrying out oxidative acid pickling, filtering and rinsing the carbon carrier, dispersing the carboncarrier in water, introducing ammonia gas, quickly stirring and drying the components, carrying out thermal decomposition, evaporating turbid liquid to dryness, and grinding the obtained solid into powder, thereby obtaining the carbon carrier for the battery catalyst. According to the pretreatment method, the texture property and the surface chemical property of the original carbon carrier can beimproved, and the loading capacity and the dispersity of noble metal particles can be improved when the prepared carbon carrier is used for preparing an electrocatalyst; according to the pretreatmentmethod, the content of ash impurities in the carbon carrier can be reduced, the washing time of the carbon carrier and the use amount of deionized water are reduced, and a pretreatment process whichis more environmentally friendly and higher in efficiency is provided for further industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrogen fuel cell materials, in particular to a preparation technology of electrocatalyst preparation materials for hydrogen fuel cells, relates to the technical field of application of new energy materials and fuel cells, and in particular to a hydrogen fuel cell catalyst Pretreatment method of carbon carrier and carbon carrier. Background technique [0002] Carbon materials have the characteristics of porous, large specific surface area, and adjustable surface chemical properties, and are the most widely used carriers in hydrogen fuel cells. First, the carbon material acts as a carrier, which can attach the noble metal nanoparticles to its surface and disperse the noble metal nanoparticles to avoid the loss of electrochemical activity due to agglomeration. Secondly, the interaction between carbon supports and noble metal nanoparticles can not only affect the activity and stability of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8817H01M4/9083Y02E60/50
Inventor 王正罗曾程宋晨辉乔红艳陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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