Carbon-loaded Co core-Pt shell nanoparticle catalyst as well as preparation method thereof

A nanoparticle and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology, etc., can solve the problems of low catalytic performance and high cost, and achieve high electrocatalytic activity for oxygen reduction and good long-term stability Effect

Active Publication Date: 2014-01-29
铜陵鑫隆钢结构有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of low electrocatalytic performance and high cost of existing carbon-supported platinum nanocatalysts

Method used

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  • Carbon-loaded Co core-Pt shell nanoparticle catalyst as well as preparation method thereof
  • Carbon-loaded Co core-Pt shell nanoparticle catalyst as well as preparation method thereof
  • Carbon-loaded Co core-Pt shell nanoparticle catalyst as well as preparation method thereof

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Embodiment 1

[0039] Preparation of carbon-supported Co nanoparticles

[0040] Take 22mg of Co(Ac) 2 4H 2 O, dissolved in 20 mL deionized water. Weigh 53 mg potassium sodium tartrate and dissolve it in 5 mL deionized water. The above two solutions were mixed and stirred for 6h to obtain solution s-1. Take 90.6mg of carbon carrier (XC-72R), ultrasonically disperse it in 100mL deionized water in advance, then mix it with solution s-1, stir evenly, overnight. Then the oil bath of the above dispersion was heated to 60°C, 10mL of hydrazine hydrate (mass fraction 40%) (density 1.03g / mL, m=4.12g) was added dropwise, then the temperature was raised to 85°C, and the reaction was kept for 10h. Cool down, filter with suction, wash with water, and disperse the obtained product (marked as Co / C) in 20 mL of chloroform (density 1.5 g / mL, m=30 g).

[0041] figure 1 This is the XRD pattern of the synthesized carbon-supported Co nanoparticles (Co / C). It can be seen from the figure that, compared with t...

Embodiment 2

[0053] Preparation of carbon-supported Co nanoparticles

[0054] Take 22mg of Co(Ac) 2 4H 2 O, dissolved in 20 mL deionized water. Weigh 88 mg potassium sodium tartrate and dissolve it in 8 mL deionized water. The above two solutions were mixed and stirred for 7h to obtain solution s-1. Take 264mg of carbon carrier (multi-walled carbon nanotubes), ultrasonically disperse in 100mL deionized water in advance, then mix with solution s-1, stir evenly, overnight. Then the oil bath of the above dispersion liquid was heated to 70°C, 88 mg of sodium borohydride was added, and then the temperature was raised to 95°C, and the reaction was kept for 2.5 hours. Cool down, filter with suction, wash with water, and disperse the obtained product (marked as Co / C) in 30 g of chloroform.

[0055] Preparation of Carbon-Supported Co Core-Pt Shell Nanoparticles

[0056] Add 1.05 g of 1-(3-aminophenyl)-3-methyl-2-imidazolidinone to the chloroform dispersion containing 190 mg Co / C, sonicate for...

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Abstract

The invention relates to the field of cathode catalysts of proton-exchange membrane fuel cells (comprising direct alcohol fuel cells, direct formic acid fuel cells and direct dimethyl ether fuel cells and the like), and provides a preparation method of a carbon-loaded Co core-Pt shell nanoparticle catalyst. Carbon-loaded Co@Pt nuclear shell nanoparticles are prepared by connecting sodium chloroplatinate on the surface of a pre-synthesized Co core through hydrogen-bond interaction by way of chemical reduction and heat treatment. The carbon-loaded Co core-Pt shell nanoparticles synthesized by the method are highly dispersed, and the grain size is 3-6.5nm. The mass ratio activity (0.5V vs.SCE) of the carbon-loaded Co core-Pt shell nanoparticles on catalytic oxygen reduction reaction at room temperature can reach 158.5mA.mg<-1>Pt to the maximum extent, and is superior to that of an industrial Pt / C catalyst (JM-3000). The catalyst can be applied to the field of cathode catalysts of proton-exchange membrane fuel cells.

Description

technical field [0001] The invention relates to the fields of energy, catalysis and related technologies, in particular to a cathode electrocatalyst for proton exchange membrane fuel cells (including direct alcohol fuel cells, direct formic acid fuel cells and direct dimethyl ether fuel cells, etc.) and a preparation method thereof. Background technique [0002] As a high-efficiency electrochemical power generation device, fuel cell directly converts chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, high energy density and environmental friendliness, and has received extensive attention from all over the world. According to the 2012 fuel cell industry review report of British Johnson Matthey Company, among the global commercial fuel cells in 2011, proton exchange membrane fuel cells (PEMFC) and direct methanol fuel cells (DMFC) accounted for 83% and 14.6% of the total market share respectively. Other types of fuel cells accou...

Claims

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Application Information

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IPC IPC(8): B01J23/89H01M4/90B82Y30/00
CPCY02E60/50
Inventor 曹剑瑜吴金燕许娟郭梦薇王文昌陈智栋
Owner 铜陵鑫隆钢结构有限公司
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