Platinum-carbon catalyst, preparation method thereof and application of platinum-carbon catalyst in fuel cell cathode catalyst

A platinum-carbon catalyst and hydrothermal carbonization technology are applied in its preparation, the application of fuel cell cathode catalysts, and the field of platinum-carbon catalysts, which can solve problems such as time-consuming, reduce pretreatment steps, are environmentally friendly, and have good ORR catalytic activity. Effect

Inactive Publication Date: 2020-03-24
FAW JIEFANG AUTOMOTIVE CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can accurately control the particle size and component ratio of the catalyst. However, sulfuric acid, nitric acid, and hydrogen peroxide are used to reflux for 6-12 hours in the pretreatment of carbon support activation, which is not only time-consuming, but also dangerous and produces a large amount of nitrogen oxides, etc. harmful gas

Method used

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  • Platinum-carbon catalyst, preparation method thereof and application of platinum-carbon catalyst in fuel cell cathode catalyst

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Effect test

Embodiment 1

[0060] 1. Put 8.2g of glucose into a 100ml beaker, add deionized water to make a 70ml solution, stir for 40min, add sodium bicarbonate solution dropwise to adjust to pH=8 while stirring.

[0061] 2. Transfer the above solution into a 100ml Teflon-lined stainless steel reactor for hydrothermal carbonization reaction at 180°C for 5h.

[0062] 3. After the liquid is naturally cooled, centrifuge and wash the solid repeatedly with deionized water and ethanol until the filtrate is clear.

[0063] 4. Dry the washed solid in a vacuum oven at 70°C for 10 hours to obtain a dry carbon support.

[0064] 5. Take 1.5g of glucose to make a 30ml solution, add 20ml of a solution containing 0.2g of chloroplatinic acid, and stir for 20min.

[0065] 6. Stir the mixed solution and heat it to 60°C and keep it warm for 30min. Take 0.3g of the carbon-loaded solution obtained in step 4 to prepare 20ml of suspension with absolute ethanol, add it to the above solution, stir for 20min, then raise the te...

Embodiment 2

[0070] 1. Take 7.5g of fructose and put it into a 100ml beaker, add deionized water to make a 70ml solution, stir for 40min, add dropwise oxalic acid solution to adjust to pH=5 while stirring.

[0071] 2. Transfer the above solution into a 100ml Teflon-lined stainless steel reactor for hydrothermal carbonization reaction at 170°C for 8h.

[0072] 3. After the liquid is naturally cooled, centrifuge and wash the solid repeatedly with deionized water and ethanol until the filtrate is clear.

[0073] 4. Dry the washed filter cake in a vacuum oven at 80°C for 8 hours to obtain a dry carbon load.

[0074] 5. Take 4.2g of glucose to make a 70ml solution, add 20ml of a solution containing 0.63g of potassium chloroplatinite, and stir for 20min.

[0075] 6. Stir and heat the mixed solution to 60°C and keep it warm for 10min. Take 0.2g of the carbon-loaded propanol obtained in step 4 to prepare 10ml of suspension, add it to the above solution, stir for 10min, then raise the temperature ...

Embodiment 3

[0080] 1. Put 8g of sucrose into a 100ml beaker, add deionized water to make a 70ml solution, stir for 40min, add acetic acid dropwise to adjust to pH=6 while stirring.

[0081] 2. Transfer the above solution into a 100ml polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction at 160°C for 12h.

[0082] 3. After the liquid is naturally cooled, centrifuge and wash the solid repeatedly with deionized water and ethanol until the filtrate is clear.

[0083] 4. Dry the washed solid in a vacuum oven at 90°C for 6 hours to obtain a dry carbon support.

[0084] 5. Take 2.8g of glucose to make a 70ml solution, add 20ml of a solution containing 0.5g of potassium chloroplatinate, and stir for 20min.

[0085] 6. Stir the mixed solution and heat it to 60°C and keep it warm for 20min. Take 0.3g of the carbon carrier obtained in step 4 and prepare 20ml of suspension with isopropanol, add it to the above solution, stir for 30min, then raise the temperatu...

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Abstract

The invention discloses a platinum-carbon catalyst, a preparation method thereof and an application of the platinum-carbon catalyst in a cathode catalyst of a fuel cell, and the preparation method comprises the following steps: 1) preparing an aqueous solution of sugar, adjusting the pH value to 5-9, then carrying out hydrothermal carbonization reaction by adopting the solution, and drying to obtain a carbon carrier material; 2) preparing a mixed solution of glucose and a platinum precursor, and heating the mixed solution; 3) adding a dispersion liquid of a carbon carrier material, adjusting the pH value to 3-10, heating, and reacting; 4) cooling and separating a reaction product to obtain a platinum-carbon catalyst precursor; and 5) calcining to obtain the platinum-carbon catalyst. According to the preparation method, cheap saccharides are used as precursors to prepare the carbon carriers, pretreatment is not needed, nano platinum particles can be well dispersed, and the catalytic performance of the prepared catalyst on oxygen reduction is superior to that of a commercial platinum-carbon catalyst. Moreover, the method is green in reaction, simple in preparation process and suitable for industrial production, and has a wide application prospect in the field of fuel cell catalysts.

Description

technical field [0001] The invention belongs to the technical field of synthesis of fuel cell cathode catalysts, and relates to a platinum carbon catalyst, its preparation method and its application in fuel cell cathode catalysts. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high energy conversion efficiency, high power density, low operating temperature and low pollution. It is considered to be an ideal clean energy conversion device and the preferred energy source for green new energy vehicles. Among them, catalyst is the key material of proton exchange membrane fuel cell. [0003] At present, many platinum-carbon catalysts use commercial carbon black, carbon nanotubes, etc. as carbon carriers when synthesizing, but the cost is relatively high, most brands rely on imports, and pretreatment is required before use, and concentrated acids, oxidants, etc. are often used. Chemicals are processed with cumbersome steps, which not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/921H01M4/926H01M2004/8689Y02E60/50
Inventor 唐柳于力娜张克金朱雅男朱云杨帅
Owner FAW JIEFANG AUTOMOTIVE CO
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