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Preparation method of poly-allylamine oriented tri-dimensional (3D) platinum nano spear self-assembly body

A technology of polyallylamine and polyallylamine hydrochloride is applied in the field of preparation of three-dimensional (3D) platinum nano-pike self-assembly, which can solve the problem of reduced stability of PEMFCs, loss of Pt nanoparticles, electrocatalytic activity Reduction and other problems, to achieve the effects of excellent electrocatalytic activity and stability, excellent long-term stability, and simple preparation method

Inactive Publication Date: 2013-08-07
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrocatalytic activity of carbon-supported Pt nanocatalysts will continue to decrease with the operation of the fuel cell. The main reasons are as follows: first, the corrosion of the carbon support leads to the loss of Pt nanoparticles; Twadel ripening leads to agglomeration of Pt nanoparticles; third, migration of Pt nanocrystals leads to particle growth
These problems lead to a severe reduction in the stability of PEMFCs

Method used

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  • Preparation method of poly-allylamine oriented tri-dimensional (3D) platinum nano spear self-assembly body
  • Preparation method of poly-allylamine oriented tri-dimensional (3D) platinum nano spear self-assembly body

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Effect test

Embodiment 1

[0024] A preparation method of polyallylamine-oriented 3D platinum nano-spear self-assembly includes the following steps:

[0025] (1) Pipette 1.0 ml 0.5 M polyallylamine hydrochloride (PAH, molecular weight 150,000) solution (Note: the concentration value is calculated based on the monomer concentration) and 2.0 ml 0.025 M K 2 PtCl 4 Mix the solution with ultrasonic, adjust the pH to 0.5 with 0.1M HCl solution under stirring, and let stand for half an hour to obtain clear PAH-Pt II Complex solution.

[0026] (2) To PAH-Pt II 0.5ml HCHO (40% wt aqueous solution, the same below) was added to the complex solution, and then put into the hydrothermal reactor; the reactor was placed in a drying box at 140℃ to make PAH-Pt II The complex reacts completely with the reducing agent, metal Pt II The target product is obtained after ion reduction.

[0027] (3) After centrifugal separation and washing, the product is placed in a vacuum drying oven to dry, to obtain the platinum nano-spear self...

Embodiment 2

[0029] A preparation method of polyallylamine-oriented 3D platinum nano-spear self-assembly includes the following steps:

[0030] (1) Pipette 1.0 ml 0.5 M polyallylamine hydrochloride (PAH, molecular weight 150,000) solution (Note: the concentration value is calculated based on the monomer concentration) and 2.0 ml 0.025 M K 2 PtCl 4 Mix the solution with ultrasonic, adjust the pH to 0.2 with 0.1M HCl solution under stirring, and let it stand for half an hour to obtain clear PAH-Pt II Complex solution.

[0031] (2) To PAH-Pt II Add 0.5ml HCHO (40%) to the complex solution, and then put it into the hydrothermal reaction kettle; place the reaction kettle in the 140℃ dry box to make PAH-Pt II The complex reacts completely with the reducing agent, metal Pt II The target product is obtained after ion reduction.

[0032] (3) After centrifugal separation and washing, the product is placed in a vacuum drying oven to dry, to obtain the platinum nano-spear self-assembly.

Embodiment 3

[0034] A preparation method of polyallylamine-oriented 3D platinum nano-spear self-assembly includes the following steps:

[0035] (1) Pipette 2.0 ml 0.5 M polyallylamine hydrochloride (PAH, molecular weight 150,000) solution (Note: the concentration value is calculated based on the monomer concentration) and 2.0 ml 0.025 M K 2 PtCl 4 Mix the solution with ultrasonic, adjust the pH to 0.5 with 0.1M HCl solution under stirring, and let it stand for half an hour to obtain clear PAH-Pt II Complex solution.

[0036] (2) To PAH-Pt II Add 0.5ml HCHO (40%) to the complex solution, and then put it into the hydrothermal reaction kettle; place the reaction kettle in the 140℃ dry box to make PAH-Pt II The complex reacts completely with the reducing agent, metal Pt II The target product is obtained after ion reduction.

[0037] (3) After centrifugal separation and washing, the product is placed in a vacuum drying oven to dry, to obtain the platinum nano-spear self-assembly.

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Abstract

The invention discloses a preparation method of a poly-allylamine oriented tri-dimensional (3D) platinum nano spear self-assembly body. Poly-allyamine hydrochloride (PAH) is taken as a complexing agent, a stabilizing agent and an appearance orienting agent, and HCHO (formaldehyde) is taken as a reducing agent; and with hydrothermal reduction method, K2PtCl4 is reduced into the platinum nano spear self-assembly body with a tri-dimensional structure consisting of one-dimensional (1D) nano spears in one step. The platinum nano spear self-assembly body is in a special tri-dimensional assembly structure, so that the platinum nano spear self-assembly body has high catalytic activity for electrochemical reduction reaction (ORR) of oxygen, and particularly has excellent lasting stability.

Description

technical field [0001] The present invention relates to a method for preparing platinum nanoparticles, in particular to a method for preparing polyallylamine-directed three-dimensional (3D) platinum nanospike self-assembly, which is used as a catalyst for the electrochemical reduction of oxygen ( ORR) exhibited high catalytic activity and excellent long-lasting stability. Background technique [0002] 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 catalytic activity and stability of catalysts is an important parameter for ORR, which affects the efficiency and commercialization of PEMFCs. Therefore, the development of catalysts with high catalytic activity and stability is very necessary for the improvement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28H01M4/92B22F9/24C08F126/02C08F8/04B82Y40/00
CPCY02E60/50
Inventor 陈煜付更涛唐亚文林军陆天虹
Owner NANJING NORMAL UNIVERSITY
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