Nitrogen-phosphorus co-doped metal organic framework encapsulated platinum-cobalt-based alloy as well as preparation method and application thereof

A technology of metal-organic frameworks and cobalt-based alloys, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve problems such as reduced catalytic activity and reduced defect sites, and achieve increased activity and improved porosity. High efficiency, good conductivity and chemical stability

Active Publication Date: 2021-03-09
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

Although the ordered structure enhances the stability of the catalyst, there are still some disadvantages: first, the defect sites are reduced after the alloy is ordered, and second, this type of catalytic material will be sintered into large nanoparticles under harsh conditions. Both of these can lead to reduced catalytic activity

Method used

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  • Nitrogen-phosphorus co-doped metal organic framework encapsulated platinum-cobalt-based alloy as well as preparation method and application thereof
  • Nitrogen-phosphorus co-doped metal organic framework encapsulated platinum-cobalt-based alloy as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a nitrogen-phosphorus co-doped metal-organic framework-encapsulated platinum-cobalt-based alloy, comprising the following steps:

[0036] (1) In a typical synthesis of ZIF-67, 1.7 mmol of cobalt nitrate was dissolved in 25.0 mL of methanol, and a transparent solution of 15.2 mmol of 2-methylimidazole dissolved in 40.0 mL of methanol was added under stirring. The mixture was stirred at room temperature for 30 min to give a heterogeneous purple mixture, which was then sealed and kept at room temperature for 12 h. Violet crystals were collected by centrifugation (5000 rpm), washed three times in methanol, and then dried under vacuum at 80° C. overnight to obtain ZIF-67.

[0037] Steps (2)-(5) are all carried out under nitrogen protection with magnetic stirring.

[0038] (2) Dissolve 0.1mmol of potassium chloroplatinite, 0.026mmol of cobalt nitrate and 0.016mmol of nickel nitrate in 20mL of isopropanol, and add 1mol / L KOH to make the pH of the soluti...

Embodiment 2

[0046] A method for preparing a nitrogen-phosphorus co-doped metal-organic framework-encapsulated platinum-cobalt-based alloy, comprising the following steps:

[0047] (1) In a typical synthesis of ZIF-67, 1.7 mmol of cobalt nitrate was dissolved in 25.0 mL of methanol, and a transparent solution of 15.2 mmol of 2-methylimidazole dissolved in 40.0 mL of methanol was added under stirring. The mixture was stirred at room temperature for 30 min to give a heterogeneous purple mixture, which was then sealed and kept at room temperature for 12 h. Violet crystals were collected by centrifugation (5000 rpm), washed three times in methanol, and then dried under vacuum at 80° C. overnight to obtain ZIF-67.

[0048] Steps (2)-(5) are all carried out under an environment with protective gas and accompanied by magnetic stirring.

[0049] (2) Dissolve 0.1mmol chloroplatinic acid, 0.016mmol cobalt acetate, and 0.026mmol nickel acetate in 35mL isopropanol, and add 1mol / L NaOH to make the pH ...

Embodiment 3

[0057] A method for preparing a nitrogen-phosphorus co-doped metal-organic framework-encapsulated platinum-cobalt-based alloy, comprising the following steps:

[0058] (1) In a typical synthesis of ZIF-67, 1.7 mmol of cobalt nitrate was dissolved in 25.0 mL of methanol, and a transparent solution of 15.2 mmol of 2-methylimidazole dissolved in 40.0 mL of methanol was added under stirring. The mixture was stirred at room temperature for 30 min to give a heterogeneous purple mixture, which was then sealed and kept at room temperature for 12 h. Violet crystals were collected by centrifugation (5000 rpm), washed three times in methanol, and then dried under vacuum at 80° C. overnight to obtain ZIF-67.

[0059] Steps (2)-(5) are all carried out under nitrogen protection with magnetic stirring.

[0060] (2) Dissolve 0.1mmol potassium chloroplatinate, 0.026mmol cobalt nitrate and 0.016mmol nickel nitrate in 20mL isopropanol, and add 1mol / L KOH to make the solution pH 12-13. Under th...

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Abstract

The invention discloses a nitrogen-phosphorus co-doped metal-organic framework encapsulated platinum-cobalt-based alloy as well as a preparation method and application thereof, and belongs to the technical field of fuel cell nano-catalyst synthesis. The preparation method comprises the steps of dissolving a platinum precursor, a cobalt precursor and a doped metal precursor in isopropanol, and adjusting the pH value of the solution to be greater than 11; stirring in an environment with shielding gas at room temperature to obtain a metal salt mixed solution; dipping ZIF-67 into the metal salt mixed solution, sealing, carrying out ultrasonic treatment, standing, dispersing into a polyol solvent, and carrying out stirring reflux heating reaction under the atmosphere of the shielding gas; dropwise adding a NaBH4 solution dissolved by isopropanol, and reacting for a period of time; after the reaction is stopped, cooling to room temperature, centrifugally separating a solid product, washing and drying; and grinding and mixing adenine phosphate and the dried solid product, then carrying out heat treatment, and cooling to room temperature to obtain the product. The method has the advantagesof simplicity, safety and the like, and is particularly suitable for preparing cathode catalysts of fuel cells and metal-air cells.

Description

technical field [0001] The invention relates to a preparation method of nano-alloy particles embedded in a metal-organic framework composite material, in particular to a nitrogen-phosphorus co-doped metal-organic framework-encapsulated platinum-cobalt-based alloy and its preparation method and application, belonging to the technical field of fuel cell nanocatalyst synthesis . Background technique [0002] The cathode oxygen reduction catalysts of proton exchange membrane fuel cells are mainly divided into two categories: one is platinum (Pt)-based catalysts, mainly including platinum carbon, platinum alloys, and platinum alloy catalysts with special structures such as core-shell and hollow; the other is platinum (Pt)-based catalysts. It is a non-platinum-based catalyst, including transition metal (Mn, Fe, Co, Ni, Cu) composite nitrogen-carbon catalysts, transition metal chalcogenide (S, Se, Te) compounds, non-metallic heteroatoms (B, N, S, P, B-N, N-P, N-S, F, Cl, Br, I) do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/92B82Y30/00B82Y40/00
CPCH01M4/8647H01M4/926B82Y40/00B82Y30/00Y02E60/50
Inventor 邵志刚索妮秦晓平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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