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Preparation method of carbon supported core-shell Ni-Pt particles for direct methanol fuel cells

A methanol fuel cell and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. It is difficult to large-scale commercial production, and the size of Pt particles is not uniform, so as to reduce the dosage, improve the electrochemical performance, and improve the catalytic performance.

Active Publication Date: 2009-06-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the lack of effective dispersants and stabilizers, the replacement process reacts quickly, the size of Pt particles is not uniform, it is difficult to control its particle size, and it is difficult to prepare highly dispersed nanoparticles as electrocatalysts; The particles use underpotential deposition, which makes the limitation of nuclear metals large, coupled with the high energy consumption of electrochemical methods, so this method is difficult to use in large-scale commercial production

Method used

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  • Preparation method of carbon supported core-shell Ni-Pt particles for direct methanol fuel cells
  • Preparation method of carbon supported core-shell Ni-Pt particles for direct methanol fuel cells
  • Preparation method of carbon supported core-shell Ni-Pt particles for direct methanol fuel cells

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specific Embodiment 1

[0018] (1) Take 40mg of XC-72 treated with sodium borohydride, add 20ml of deionized water and 20ml of isopropanol in turn, and sonicate for 10min.

[0019] (2) Under magnetic stirring at 60°C, add 0.1mol / L and 1.5ml of Ni(Ac) in sequence 2 , 0.1mol / L, 1.0ml of sodium citrate and 10mg of CTAB.

[0020] (3) Stir and heat up to 80°C, slowly add 0.1mol / L, 4.5ml of sodium hypophosphite, and react for 1 hour. Cool to room temperature, centrifuge, and wash thoroughly with distilled water and acetone four times to remove excess sodium hypophosphite. The obtained catalyst is denoted as Ni@Pt / C(1:0).

[0021] According to the cyclic voltammetry test, the carbon-supported core-shell platinum catalyst material Ni@Pt / C(1:0) for DMFC of the present invention has almost no catalytic activity for hydrogen oxidation, that is, it exhibits the properties of pure Ni.

specific Embodiment 2

[0022] (1) Take 40mg of XC-72 treated with sodium borohydride, add 20ml of deionized water and 20ml of isopropanol in turn, and sonicate for 10min.

[0023] (2) Under magnetic stirring at 60°C, add 0.038mol / L and 0.6ml of H 2 PtCl 6 , 0.1mol / L, 1.0ml of sodium citrate and 10mg of CTAB.

[0024] (3) Stir and heat up to 80°C, slowly add 0.1mol / L, 4.5ml of sodium hypophosphite, and react for 1 hour. Cool to room temperature, centrifuge, and wash thoroughly with distilled water and acetone four times to remove excess sodium hypophosphite. The obtained catalyst is denoted as Ni@Pt / C(0:1).

[0025] Through the test of cyclic voltammetry, the carbon-supported core-shell platinum catalyst material Ni@Pt / C(0:1) for DMFC of the present invention hardly exhibits electrochemical catalytic activity, and only exhibits the capacitive performance of XC-72, indicating that Pt is generated by a reaction of replacing Ni.

specific Embodiment 3

[0026] (1) Take 40mg of XC-72 treated with sodium borohydride, add 20ml of deionized water and 20ml of isopropanol in turn, and sonicate for 10min.

[0027] (2) Under magnetic stirring at 60°C, add 0.1mol / L and 1.5ml of Ni(Ac) in sequence 2, 0.1mol / L, 1.5ml of sodium citrate and 10mg of CTAB.

[0028] (3) Stir and heat up to 95°C, slowly add 0.1mol / L, 7.5ml sodium hypophosphite, and react for 5 hours. Cool to room temperature, centrifuge, and wash thoroughly with distilled water and acetone four times to remove excess sodium hypophosphite.

[0029] (4) Disperse the centrifuged product with water and isopropanol, add 5 mg of CTAB, heat up to 60° C., and stir for 10 min.

[0030] (5) Adjust the pH value to 5-6 with 0.2mol / L HCl.

[0031] (6) Add 0.038mol / L, 0.35ml of H 2 PtCl 6 The solution was replaced, and the reaction time was 5h. Cool to room temperature, centrifuge, wash with acetone, and dry under vacuum at 80°C for 12h. The obtained catalyst is denoted as Ni@Pt / C(5...

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Abstract

The invention provides a method for preparing carbon-supported nucleocapsid type Ni-Pt particles for direct methanol fuel cell catalysts, which belongs to a preparation process of direct methanol fuel cell catalysts. The method comprises the steps of adopting sodium citrate as a stabilizer, adopting cationic surfactant CTAB as dispersant, using sodium hypophosphite to reduce nickel acetate, generating a Ni kernel on the surface of Vulcan XC-72 or mesoporous carbon treated with sodium borohydride, washing superfluous sodium hypophosphite and generating a Pt shell on the surface of the Ni kernel through chemical replacement. The catalyst has a structure with the Ni kernel and the Pt shell, and has the advantages of low Pt support amount and high catalytic activity.

Description

technical field [0001] The invention relates to a method for preparing carbon-loaded core-shell Ni-Pt particles used as catalysts for direct methanol fuel cells, which belongs to the preparation process of catalysts for direct methanol fuel cells. technical background [0002] Direct methanol fuel cells (DMFC) often use carbon-supported platinum as a catalyst for the electrochemical reaction of the electrode. In the early days, the Pt / C catalyst developed by E-TEK in the United States was widely used in commercial production due to its excellent catalytic performance. However, as the resource shortage of precious metal Pt increases and the price is high, the application of Pt in fuel cells has to be reduced; on the other hand, the intermediate products of methanol oxidation, such as CO, are easy to poison Pt catalysts. Therefore, reducing the amount of Pt and researching and developing anode catalysts with high catalytic activity and resistance to CO poisoning is a very imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 何建平孙盾周建华王涛王道军狄志勇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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