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Preparation method and application of carbon-loaded platinum cobalt nanometer alloy catalyst

An alloy catalyst, cobalt nanotechnology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of limiting the commercialization process of fuel cells, the scarcity of Pt resources, and the high cost of catalysts. The effect of uniform size, good dispersion and simple preparation process

Inactive Publication Date: 2018-07-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost of fuel cell catalysts limits commercialization in fuel cells due to the high cost of catalysts due to the scarcity and high price of Pt resources, and the slow kinetics of the oxygen reduction reaction (ORR) limits the efficiency and performance of these devices. process

Method used

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  • Preparation method and application of carbon-loaded platinum cobalt nanometer alloy catalyst
  • Preparation method and application of carbon-loaded platinum cobalt nanometer alloy catalyst
  • Preparation method and application of carbon-loaded platinum cobalt nanometer alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the preparation method of this carbon-supported platinum-cobalt nano-alloy catalyst, concrete operations are as follows:

[0035] (1) Take 60mg of platinum acetylacetonate, 12.3mg of cobalt acetate, Po:Co=3:1, dissolve in 0.6mL of o-dichlorobenzene, then add 15mL of diphenyl ether and 0.2mL of oleylamine into the solution ﹑Use 0.2mL of oleic acid and 43mg of 1,2-tetradecanediol to obtain a mixed solution;

[0036] (2) Stir and heat the mixed solution obtained in step (1) to 160°C and keep it warm for 30 minutes, then raise the temperature to 230°C, add 126.8 mg of activated carbon powder when the solution starts to turn brown, and keep it warm for 1 hour;

[0037] (3) Cool the reaction product after heat preservation in step (2) to 23°C, then add 20mL cyclohexane and 10mL absolute ethanol to the reaction product, the volume ratio of cyclohexane and absolute ethanol is 2:1, and ultrasonically Suction filtration and separation after uniform dispersion to ob...

Embodiment 2

[0041] Embodiment 2: the preparation method of this carbon-supported platinum-cobalt nano-alloy catalyst, concrete operation is as follows:

[0042] The preparation method of the carbon-supported platinum-cobalt nano-alloy catalyst in this example is the same as in Example 1, except that the holding time in step (5) is 4 hours.

[0043] figure 2 The TEM figure of the carbon-supported platinum-cobalt nano-alloy catalyst prepared for the present embodiment, figure 2 Show Pt 3 The Co alloy has been supported on carbon and has good dispersion.

Embodiment 3

[0044] Embodiment 3: the preparation method of this carbon-supported platinum-cobalt nano-alloy catalyst, concrete operation is as follows:

[0045] The preparation method of the carbon-supported platinum-cobalt nano-alloy catalyst in this example is the same as in Example 1, except that the holding time in step (5) is 6 hours.

[0046] image 3 The TEM figure of the carbon-supported platinum-cobalt nano-alloy catalyst prepared for the present embodiment, image 3 It shows that the nanoparticles are mainly distributed between 1.00 ~ 3.00nm, compared with Example 1 and Example 2, it shows that the further increase of the holding time, the size of the nanoparticles is smaller.

[0047] Figure 4 It is the Pt synthesized by Examples 1, 2, and 3 of the present invention 3 Co / C nanoalloy catalyst in 0.1M HClO 4 Solution O 2 Comparison of LSV curves in atmosphere, Figure 4 Indicates that the holding time has a significant effect on Pt 3 The Co / C nano-alloy catalyst has an in...

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Abstract

The invention discloses preparation method and application of a carbon-loaded platinum cobalt nanometer alloy catalyst, and belongs to the technical field of synthesis of a fuel cell nanometer catalyst. The preparation method comprises the steps of taking platinum acetylacetonate and cobalt acetate as a precursor and carbon powder as a carrier, synthesizing the carbon-loaded platinum cobalt nanometer alloy catalyst by a chemical thermal reduction method, drying the carbon-loaded platinum cobalt nanometer alloy catalyst, performing thermal processing to control surface constituent of Pt-Co nanometer alloy under reduction atmosphere so that Pt is segregated onto a surface of nanoparticle, and finally obtaining the high-activity carbon-loaded platinum cobalt nanometer alloy catalyst with richPt on the surface of the Pt-Co nanoparticle. The carbon-loaded platinum cobalt nanometer alloy catalyst has relatively high oxidization-reduction reaction activity and chemical stability when appliedto a negative electrode catalyst of a low-temperature hydrogen-oxygen fuel cell; by the method, the detect that precious metal particle is easy to agglomerate and is poor in dispersion performance issolved; and moreover, the preparation method is simple and convenient to operate, is low in cost and is suitable for industrial production on a large scale, and the problem of high cost of a fuel cell is solved.

Description

technical field [0001] The invention relates to a preparation method of a nano-alloy catalyst, in particular to a preparation method and application of a carbon-supported platinum-cobalt nano-alloy catalyst, and belongs to the technical field of synthesis of fuel cell nano-catalysts. Background technique [0002] Today, with the rapid development of new energy sources, fuel cells have always played an important role in energy storage and conversion. Fuel cells have the advantages of high power density, high energy conversion efficiency, low operating temperature, and low environmental pollution. They are considered to be ideal clean energy conversion devices, and are very suitable as power sources for green new energy vehicles. Fuel cells are mainly composed of catalysts, exchange membranes, bipolar plates, carbon paper, etc., and catalysts account for 50% of the total cost of proton exchange membrane fuel cells. Catalysts account for a large proportion of proton exchange me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92B82Y30/00
CPCH01M4/8825H01M4/9041H01M4/9083H01M4/926B82Y30/00Y02E60/50
Inventor 杨喜昆魏清茂吴帅伍小龙谭丰李卫张宇振孙培川闵春刚
Owner KUNMING UNIV OF SCI & TECH
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