Preparation method of supported platinum-based alloy catalyst for low temperature fuel cell

A fuel cell, platinum-based alloy technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve complex operation of sodium borohydride reduction method, uneven distribution of catalyst particles, excessive alloy particle size to improve the catalytic activity of oxygen reduction, the preparation method is simple and effective, and the effect of reducing the amount of platinum

Inactive Publication Date: 2019-06-25
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

The traditional sodium borohydride reduction method uses water as a solvent, and the particle size and dispersion of metal particles are ensured by adding surfactants, but there are still problems of uneven distribution of catalyst particles and excessive alloy particle size, and the surfactant Strong binding force with platinum, etc., difficult to remove by washing, affecting catalyst activity
Surfactant-stabilized sodium borohydride reduction is complex and only suitable for small-scale experimental studies

Method used

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  • Preparation method of supported platinum-based alloy catalyst for low temperature fuel cell
  • Preparation method of supported platinum-based alloy catalyst for low temperature fuel cell
  • Preparation method of supported platinum-based alloy catalyst for low temperature fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) H 2 PtCl 6 ·6H 2 O and CoCl 2 ·6H 2 O was dissolved in 2ml deionized water, and the atomic ratios of Pt to Co were 4:1, 3:1, 2:1, 1:1, 1:2. Stir to combine evenly.

[0029] (2) In ethylene glycol, add the carrier, stir for 10 minutes, and ultrasonically 30 minutes to make it evenly dispersed;

[0030] (3) Stir the dispersion at room temperature for 30 min, and feed N 2 Or Ar, forming an inert atmosphere of the reaction system;

[0031] (4) The reducing agent was added to the above dispersion liquid, followed by the mixed solution of Pt and Co precursors, and stirred at room temperature for 3 h. The total molar concentrations of Pt and Co elements in the system are respectively 3.6mmol / L, 3.75mmol / L, 3.9mmol / L, 4.2mmol / L and 4.95mmol / L, and the molar concentrations of the reducing agent are respectively the total molar concentrations of Pt and Co elements 18.5, 17.8, 17.4, 16.6, 14.9 times the concentration.

[0032] (5) After the reaction, separate by centr...

Embodiment 2

[0034] (1) The water-soluble Pt precursor K 2 PtCl 4and Ni precursor NiCl 2 ·6H 2 O (please give specific example) is dissolved in 2ml of deionized water, and the atomic ratio of Pt to Ni is 1:2. Stir to combine evenly.

[0035] (2) In ethylene glycol, add the carrier, stir for 10 minutes, and ultrasonically 30 minutes to make it evenly dispersed;

[0036] (3) Stir the dispersion at room temperature for 30 min, and feed N 2 Or Ar, forming an inert atmosphere of the reaction system;

[0037] (4) Add the reducing agent to the above dispersion liquid, then add the Pt and Ni precursor mixed solution, and stir at room temperature for 12h, so that the total concentration of Pt and Ni elements in the system is 6mmol / L, and the molar concentration of the reducing agent is Pt And 12.7 times the total molar concentration of Ni element.

[0038] (5) After the reaction, separate by centrifugation or filtration, wash with ethanol and deionized water for 5 times respectively, and add...

Embodiment 3

[0040] (1) Na 2 PtCl 6 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 O is dissolved (please give a specific example) in 2ml deionized water, and the atomic ratio of Pt to Ni is 1:2. Stir to combine evenly.

[0041] (2) In ethylene glycol, add the carrier, stir for 10 minutes, and ultrasonically 30 minutes to make it evenly dispersed;

[0042] (3) Stir the dispersion at room temperature for 30 min, and feed N 2 Or Ar, forming an inert atmosphere of the reaction system;

[0043] (4) Add the reducing agent to the above dispersion liquid, and then add the Pt and Ni precursor mixed solution, so that the total concentration of Pt and Ni elements in the system is 6mmol / L, and the molar concentration of the reducing agent is the total molar concentration of Pt and Ni elements 12.7 times. Stir at 80°C reaction temperature for 3h.

[0044] (5) After the reaction, separate by centrifugation or filtration, wash with ethanol and deionized water for 4 times respectively, and then vacuum dry at 60...

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Abstract

The invention provides a preparation method of a supported platinum-based alloy catalyst. The catalyst can be used as a low temperature fuel cell catalyst. The preparation method comprises the steps of taking ethylene glycol as a solvent and stabilizer, dispersing a carrier in the solvent, and reducing platinum and non-platinum precursors by strong reducing agents such as borohydride, hydrazine hydrate and tetrabutyl borohydride to obtain supported platinum-based alloy nanoparticles. The preparation method adopted by the invention is simple, effective and free of a problem of difficult removalof the stabilizer. The prepared alloy catalyst has a small particle size and uniform particle size distribution, and has good dispersion on the carrier at the same time. In addition, the catalyst canshow high area specific activity and unit mass Pt specific activity for oxygen reduction reaction, can effectively reduce the platinum consumption and has potential application prospects in the low temperature fuel cell.

Description

technical field [0001] The invention relates to an alloy nano-catalyst, in particular to a method for preparing a supported platinum-based alloy catalyst for a low-temperature fuel cell. Background technique [0002] With the increasing depletion of fossil energy, environmental pollution and climate change, clean energy has attracted great attention from all over the world. Proton exchange membrane fuel cells have the advantages of cleanliness, high efficiency, high power density, and low-temperature fast start-up, and are widely used in vehicle power supplies and distributed power generation. However, the commercialization of proton exchange membrane fuel cells is facing the problem of high cost, in which the catalyst occupies a large proportion, because the catalyst uses Pt, and the resource of Pt is limited, so the price is very high. In order to reduce the cost of fuel cells, the amount of Pt must be reduced, which requires an increase in the catalytic activity per unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCY02E60/50
Inventor 邵志刚唐雪君秦晓平曹龙生衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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