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 the problems of reduction, catalyst performance reduction, unfavorable cost, etc., to prevent agglomeration, slow down the corrosion rate, prolong the The effect of the service life

Inactive Publication Date: 2010-06-16
BEIJING UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Document [ZL CN 1790785A] NaH2PO2.H2O is added to chloroplatinic acid and ruthenium trichloride to reduce PtRuP, and the added phosphorus cuts off the metal bond (Metallic Bond) between platinum and ruthenium to realize miniaturization and dispersion; The effect that distribution scope reduces, but the raw material that this method prepares catalyzer used is noble metal or rare metal, is unfavorable for the reduction of cost; ] belongs to the prepared Pt 3 Ni 1 The addition of Ni in the / C catalyst effectively prevents the growth of platinum particles, but the corrosion of non-noble metals reduces the performance of the catalyst

Method used

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Examples

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Embodiment 1

[0026] Example 1: Weigh 0.13g of pretreated (activation → sensitization of carbon nanotubes) CNT and add it to 50ml of a solution with a platinum content of 0.128g and a nickel content of 0.08g, and the auxiliary agent is 0.32g of anhydrous Sodium acetate + 0.32g trisodium citrate, ultrasonic vibration for 10 minutes under airtight conditions, and then mechanically stirred for 30 minutes to prepare a raw material solution, sodium hypophosphite as reducing agent, the concentration of sodium hypophosphite under the entire reduction condition is 0.8mol / L, the concentration of sodium hypophosphite is 6 times (molar ratio) of noble metal, and the raw material liquid passes N 2 Under atmospheric conditions, in a water bath at 85-90°C, add a solution of 10ml of reducing agent dropwise under mechanical stirring, adjust the pH value with NaOH concentrated solution during the reduction process, and control the pH value at 9, and complete the reduction after 1 hour under sufficient stirr...

Embodiment 2

[0027]Example 2: Weigh 0.13g of pretreated (CNT activation → sensitization) CNT and add it to 50ml of a solution with a platinum content of 0.128g and a nickel content of 0.039g, and the auxiliary agent is 0.32g of anhydrous sodium acetate +0.32g trisodium citrate, ultrasonically oscillate for 10 minutes under airtight conditions, and then mechanically stir for 30 minutes to prepare a raw material solution. Sodium hypophosphite is used as a reducing agent. The concentration of sodium hypophosphite under the entire reduction condition is 0.8mol / L. The concentration of sodium hypophosphite is 8 times that of noble metal (molar ratio), and the raw material liquid is passed through N 2 Under atmospheric conditions, in a water bath at 85-90°C, add a solution of 10ml of reducing agent drop by drop under mechanical stirring. During the reduction process, use NaOH concentrated solution to adjust the pH value, and the pH value is controlled at 11. After 0.5h under the condition of suffi...

Embodiment 3

[0028] Example 3: Weigh 0.21g of pretreated (CNT activation→sensitization) CNT and add it to 50ml of a solution with a platinum content of 0.279g and a nickel content of 0.04g, and the auxiliary agent is 0.32g of anhydrous sodium acetate + 0.32g trisodium citrate, ultrasonically oscillated for 10 minutes under airtight conditions, and then mechanically stirred for 30 minutes to prepare a raw material solution. Sodium hypophosphite was used as a reducing agent. The concentration of sodium hypophosphite under the entire reduction condition was 1.05mol / L. The concentration of sodium hypophosphite is 8 times that of noble metal (molar ratio), and the raw material liquid is passed through N 2 Under atmospheric conditions, in a water bath at 85-90°C, add a solution of 10ml of reducing agent drop by drop under mechanical stirring. During the reduction process, use NaOH concentrated solution to adjust the pH value, and the pH value is controlled at 11. After 0.5h under the condition of...

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Abstract

The invention relates to a preparation method of a fuel-cell catalyst, belonging to the field of catalysts. The preparation method of the fuel-cell catalyst comprises the following steps of: using a CNT as a vector; adding sodium phosphite to a nickel sulfate and chloroplatinic acid solution; controlling the pH value and the temperature of the solution; hydrolyzing the sodium phosphite to release P; forming an alloy solid solution by the P generated through the self reduction of the sodium phosphite and reduced Pt and Ni, wherein the addition of Ni stops the remove of platinum particles of the fuel-cell catalyst, the addition of P inhibits the corrosion of non-noble metal, the formation of the alloy realizes the fining and the decentralization of the Pt particles, and the particle diameters of the fuel-cell catalyst are uniformly distributed. A test result shows that the fuel-cell catalyst has excellent property. The method is convenient and easy to operate, reduces the cost by doping Ni to noble metal, also effectively inhibits the corrosion of the non-noble metal and meets the requirements of the direct development and the utilization of the field of direct methanol fuel cells and the like.

Description

technical field [0001] The invention relates to a preparation method of a Pt-Ni-P / CNT fuel cell catalyst. Background technique [0002] Since the 1980s, many people have devoted themselves to the development of platinum alloy fuel cell catalysts. Because platinum is expensive and resources are scarce, it is necessary to use appropriate preparation methods and process conditions to reduce the amount of platinum used in the catalyst. content, but at the same time, it can achieve the same catalytic effect as platinum or better than platinum. There are two aspects to the stable performance of Pt alloy catalysts: [0003] 1. The reduction of the active surface caused by the agglomeration of Pt particles; [0004] ●2. Corrosion of non-precious metals is another main reason for the reduction of oxygen reduction performance. [0005] Catalyst in the present invention effectively solves the content of these two aspects, and the anchoring effect of Ni prevents the migration and agg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J23/89H01M4/90H01M4/92
CPCY02E60/50
Inventor 田英良汤清琼孙诗兵张继光张港
Owner BEIJING UNIV OF TECH
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