A kind of preparation method of monodisperse core-shell nano-catalyst for fuel cell

A technology of core-shell nanometer and fuel cell, applied in nanotechnology for material and surface science, battery electrode, nanotechnology, etc.

Active Publication Date: 2021-04-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports in published patents on methods for effectively preparing monodisperse alloys and core-shell nanoparticles with particle sizes less than 3 nm.

Method used

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  • A kind of preparation method of monodisperse core-shell nano-catalyst for fuel cell
  • A kind of preparation method of monodisperse core-shell nano-catalyst for fuel cell
  • A kind of preparation method of monodisperse core-shell nano-catalyst for fuel cell

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Add 25mg of sodium borohydride to 20mL of ethylene glycol solution, add 1.2mL of 0.1M cobalt chloride in ethylene glycol solution under vigorous stirring, and stir for 20min.

[0035] 2. Add a mixed solution of 0.4 mL of 0.1 M cobalt chloride and 0.4 mL of 50 mM potassium chloroplatinate dropwise to the above solution, and react for 10 min.

[0036] 3. Add 16mg of XC72 activated carbon to the above solution, stir at 60°C for 6 hours, centrifuge, wash, and dry. The obtained catalyst is denoted as Co 6 @Co 2 Pt 1 / C.

[0037] figure 1 for Co 6 @Co 2 Pt 1 TEM image of / C. figure 2 for Co 6 @Co 2 Pt 1 Size distribution plot of nanoparticles. image 3 for Co 6 @Co 2 Pt 1 Cyclic voltammetry and oxygen reduction polarization curves of / C in rotating disk electrode (RDE) test.

Embodiment 2

[0047] 1. Add 25mg of sodium borohydride into 20mL of ethylene glycol solution, add 1.2mL of 0.1M cobalt chloride in ethylene glycol solution under vigorous stirring, and stir for 30min.

[0048] 2. Add a mixed solution of 0.4mL 0.1M cobalt chloride and 0.4mL 50mM potassium chloroplatinite dropwise to the above solution, and react for 30min.

[0049] 3. Add 16 mg of XC72 activated carbon to the above solution, stir at 90°C for 10 hours, centrifuge, wash, and dry. The obtained catalyst is denoted as Co 6 @Pt 1 / C.

[0050] Figure 6 for Co 6 @Pt 1 TEM image of / C. Figure 7 for Co 6 @Pt 1 Size distribution plot of nanoparticles. Figure 8 for Co 6 @Pt 1 Cyclic voltammetry and oxygen reduction polarization curves of / C in rotating disk electrode (RDE) test.

Embodiment 3

[0052] 1. Add 32mg of sodium borohydride into 20mL of ethylene glycol solution, add 2.0mL of 0.1M cobalt chloride in ethylene glycol solution under vigorous stirring, and stir for 10min.

[0053] 2. Add a mixed solution of 0.2mL 0.1M nickel chloride and 0.4mL 50mM chloroplatinic acid dropwise to the above solution, and react for 10min.

[0054] 3. Add 16 mg of XC72 activated carbon to the above solution, stir at 80°C for 5 hours, centrifuge, wash, and dry. The obtained catalyst is denoted as Co 10 @Ni 1 Pt 1 / C.

[0055] Figure 9 for Co 10 @Ni 1 Pt 1 TEM image of / C. Figure 10 for Co 10 @Ni 1 Pt 1 Size distribution diagram of / C nanoparticles. Figure 11 for Co 10 @Ni 1 Pt 1 Cyclic voltammetry and oxygen reduction polarization curves of / C in rotating disk electrode (RDE) test.

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Abstract

The invention relates to a monodisperse platinum-iron, platinum-cobalt and platinum-nickel core-shell catalyst less than 3nm and application thereof. Specifically, in the solution, iron, cobalt or nickel metal nanoparticles are first prepared in the solution, and then the obtained iron, cobalt or nickel metal nanoparticles are used as crystal nuclei to prepare ultra-small core-shell nanoparticles, and finally the ultra-small The core-shell nano-particles are loaded on the carrier to obtain a loaded ultra-small core-shell nano-particle electrocatalyst for fuel cells. The test found that the oxygen reduction catalytic activity of the monodisperse platinum-cobalt core-shell catalyst smaller than 3nm is 7.8 times that of the commercial catalyst. The ultra-small core-shell electrocatalyst obtained by the preparation method has great application prospects in proton exchange membrane fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a monodisperse core-shell nano catalyst for a fuel cell. Background technique [0002] The high cost of proton exchange membrane fuel cells (PEMFC) is still one of the main bottlenecks restricting its large-scale commercialization. Among the materials and components used in PEMFC, platinum-based electrocatalysts and their associated catalytic layers account for more than half of the total cost of the entire cell. The main polarization of PEMFC comes from the slow cathodic oxygen reduction reaction (ORR) rather than the anodic hydrogen oxidation reaction (HOR). Without sacrificing the performance of fuel cells, reducing the amount of platinum (especially the amount of cathode catalyst) is very beneficial to reduce the cost of PEMFC, thereby promoting its commercialization. Therefore, new high-efficiency catalysts need to have high activity and stability. Alloying platinum with other transition metal el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCY02E60/50
Inventor 邵志刚曹龙生唐雪君秦晓平杨丽梦衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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