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Preparation method of platinum/family IV metal nitrides/graphene multilayer electrocatalyst

A technology of electrocatalysts and nitrides, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems affecting catalytic effects and achieve high applicability and high conductivity

Inactive Publication Date: 2019-04-05
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the improvement methods of platinum-based catalysts are as follows: (1) synthesis of platinum alloys: by introducing a second metal atom, the active sites of platinum are released, and the amount of platinum is reduced while improving catalytic performance; (2) Control morphology: increase the specific surface area by controlling the particle size and dispersion of platinum nanoparticles, and then improve the electrocatalytic performance; (3) improve its anti-CO poisoning ability: because some CO intermediates will be generated during the oxidation of alcohols The product will be preferentially adsorbed on the active site of platinum, affecting its catalytic effect

Method used

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  • Preparation method of platinum/family IV metal nitrides/graphene multilayer electrocatalyst
  • Preparation method of platinum/family IV metal nitrides/graphene multilayer electrocatalyst
  • Preparation method of platinum/family IV metal nitrides/graphene multilayer electrocatalyst

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Embodiment 1

[0031] A preparation method of platinum / TiN / graphene catalyst, comprising the steps of:

[0032] (1) Measure 1.20mL of TiCl 4 Dissolve in 5mL ethanol, add 0.72g urea after dissolving and grind for 1h;

[0033] In other embodiments NbCl5 or TaCl5 can be used instead of TiCl 4， Use n-butanol when dissolving TaCl.

[0034] (2) The solution obtained in step (1) was directly calcined in a tube furnace, and the solution was calcined at 2°C per minute under an Ar gas atmosphere.

[0035] The speed was raised to 800°C, kept for 4 hours, and cooled to room temperature naturally.

[0036] In other embodiments, when using NbCl5 as a raw material, the calcination temperature is 900°C. When using TaCl5 as raw material, the calcination temperature is 1000°C.

[0037] (3) The product obtained in step (2) is alternately washed several times with secondary water and ethanol and dried to obtain the product.

[0038] (4) Weigh 50 mg of the product obtained in step (3) into 80 mL of seconda...

Embodiment 2

[0042] A Pt / Nb 4 N 5 The preparation method of / graphene catalyst comprises the steps:

[0043] (1) Measure 2 g of NbCl 5 Dissolve in 5mL ethanol, gradually add 0.72g urea and stir for 1h after dissolution.

[0044] (2) The colloidal solution obtained in step (1) was directly placed in a tube furnace for calcination, raised to 900°C at a rate of 2°C per minute under an Ar gas atmosphere, kept for 4 hours, and naturally cooled to room temperature.

[0045] (3) The product obtained in step (2) is alternately washed several times with secondary water and ethanol and dried to obtain Nb 4 N 5 / Graphene.

[0046] (4) Weigh 50 mg of Nb from step (3) 4 N 5 / C was added to 80mL of secondary water, and fully stirred evenly.

[0047] (5) Add the product obtained in step (4) into the chloroplatinic acid solution in a mass ratio of 10%, and stir for 1 hour.

[0048] (6) Add 20mL (1g / L) NaBH to step (5) 4 solution, stirred for 1 hour, centrifuged, washed and dried to obtain platinu...

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Abstract

The invention discloses a preparation method of a platinum / family IV metal nitrides / graphene multilayer electrocatalyst. The preparation method includes the steps of adding family IV metal chlorides and urea into an organic small-molecular alcohol, stirring and mixing well to obtain colloid, drying in a vacuum oven, transferring to a tubular furnace, heating in an argon atmosphere to 800-1000 DEGC for 4 hours to obtain family IV metal nitrides / graphene two-dimensional double-layer composite, allowing the composite to naturally cool, washing with ethanol and secondary deionized water separately, dispersing in secondary deionized water, adding chloroplatinic acid, stirring for 2 hours, adding NaBH4, and depositing a layer of Pt nanoparticles on the surface of the family IV metal nitrides / graphene two-dimensional double-layer composite supporter so as to obtain the platinum / family IV metal nitrides / graphene multilayer electrocatalyst. The platinum / family IV metal nitrides / graphene multilayer electrocatalyst provided herein has many active sites, has great ability to resist CO poisoning, has greatly improved activity stability, and exhibits low Pt, long-acting effect, poisoning resistance and the like in alcohol electrocatalytic oxidation process.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials, in particular to a platinum-based / group IV metal nitride / graphene multilayer electrocatalytic material and a preparation method thereof. Background technique [0002] In recent years, energy and environmental protection issues have become the focus of attention. Environmentally friendly energy has become the driving force for the sustainable development of our human life. Direct alcohol fuel cells (DAFCs), because of its high energy conversion efficiency, low pollution emissions, and portability, are recognized as a new energy utilization method. Direct Alcohol Fuel Cell (DAFC) has been paid attention to by researchers because of its wide source of fuel, short-chain and low-molecular-weight alcohols that are safe to transport, and the resulting product is non-polluting after complete reaction, so it has made great achievements in recent years. big achievement. However, it is still not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/394B01J35/33
Inventor 柴占丽杨婷白萍张彩霞毕希王晓晶
Owner INNER MONGOLIA UNIVERSITY