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Poly-allylamine oriented platinum nano cube preparation method

A technology of polyallylamine and polyallylamine hydrochloride, which is applied in the field of preparation of platinum nanoparticles, can solve the problems of reducing platinum and the scarcity of platinum reserves, and achieves uniform size, simple preparation method, and simple preparation method easy effect

Inactive Publication Date: 2013-01-16
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the scarcity of platinum reserves, how to reduce the amount of platinum on the premise of improving the activity and selectivity of platinum-based catalysts is still a research hotspot in this field.

Method used

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  • Poly-allylamine oriented platinum nano cube preparation method
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  • Poly-allylamine oriented platinum nano cube preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of polyallylamine-oriented platinum nanocubes, comprising the following steps:

[0027] (1) Pipette 1.0 ml 0.5 M polyallylamine hydrochloride (PAH, molecular weight 150,000) solution (Note: the concentration value is calculated based on monomer concentration) and 2.0 ml 0.025 M K 2 PtCl 4 solution, ultrasonically mixed, adjusted to pH 3.0 with 0.1M NaOH solution under stirring, and left to stand for half an hour to obtain clear PAH-Pt II complex solution.

[0028] (2) To PAH-Pt II Add 0.1ml HCHO (40%wt aqueous solution, the same below) to the complex solution, then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 140°C to make PAH-Pt II The complex reacts completely with the reducing agent, the metal Pt II After ion reduction, a black suspension was obtained.

[0029] (3) Then the black suspended matter is centrifuged, washed, and dried in a vacuum oven to obtain the cubic platinum nanoparticles with go...

Embodiment 2

[0031] A preparation method of polyallylamine-oriented platinum nanocubes, comprising the following steps:

[0032] (1) Pipette 1.0 ml 0.5 M polyallylamine hydrochloride (PAH, molecular weight 150,000) solution (Note: the concentration value is calculated based on monomer concentration) and 2.0 ml 0.025 M K 2 PtCl 4 solution, ultrasonically mixed, adjusted to pH 6.0 with 0.1M NaOH solution under stirring, and left to stand for half an hour to obtain clear PAH-Pt II complex solution.

[0033] (2) To PAH-Pt II Add 0.1ml HCHO (40%) to the complex solution, then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 140°C to make PAH-Pt II The complex reacts completely with the reducing agent, the metal Pt II After ion reduction, a black suspension was obtained.

[0034] (3) Then the black suspended matter is centrifuged, washed, and dried in a vacuum oven to obtain the cubic platinum nanoparticles with good dispersion and stability.

Embodiment 3

[0036] A preparation method of polyallylamine-oriented platinum nanocubes, comprising the following steps:

[0037] (1) Pipette 1.0 ml 0.5 M polyallylamine hydrochloride (PAH, molecular weight 150,000) solution (Note: the concentration value is calculated based on monomer concentration) and 2.0 ml 0.025 M K 2 PtCl 4 solution, ultrasonically mixed, adjusted to pH 9.0 with 0.1M NaOH solution under stirring, and allowed to stand for half an hour to obtain clear PAH-Pt II complex solution.

[0038] (2) To PAH-Pt II Add 0.1ml HCHO (40%) to the complex solution, then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 140°C to make PAH-Pt II The complex reacts completely with the reducing agent, the metal Pt II After ion reduction, a black suspension was obtained.

[0039] (3) Then the black suspended matter is centrifuged, washed, and dried in a vacuum oven to obtain the cubic platinum nanoparticles with good dispersion and stability.

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Abstract

The invention discloses a poly-allylamine oriented platinum nano cube preparation method. A hydrothermal reduction method is used for reducing K2PtCl4 into cubic platinum nano particles regular in shape and uniform in size by taking PAH (poly-allylamine hydrochloride) as complexing agent, stabilizing agent and morphological guide agent and taking HCHO as reducing agent. The platinum nano particles are in a cubic structure consisting of six {100} crystal faces and have excellent dispersibility and stability in aqueous solution and is high in catalytic activity and stability to electrochemical oxygen reduction reaction (ORR). The preparation method is simple, economical and suitable for industrial massive production.

Description

technical field [0001] The present invention relates to a method for preparing platinum nanoparticles, in particular to a method for preparing polyallylamine-directed platinum nanocubes (Pt-Nanocubes), which are used as catalysts for the electrochemical reduction of oxygen (ORR) exhibited high catalytic activity and stability. Background technique [0002] Shape-controllable platinum-based nanoparticles exhibit superior physical and chemical properties due to their unique surface structures, and exhibit high selectivity and catalytic activity for many catalytic reactions. It is widely used as a catalyst in automobile exhaust purification and fuel cells. Proton exchange membrane fuel cells (PEMFCs) have attracted increasing attention due to their high energy conversion efficiency, low operating temperature, and low pollution emissions. In PEMFCs, the oxygen reduction reaction (ORR) is one of the most important reactions. From the perspective of reaction kinetics, the catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 陈煜付更涛林军
Owner NANJING NORMAL UNIVERSITY
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