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Preparation method for porous PtAg@Pt octahedral nanoparticle

A nanoparticle and octahedral technology, which is applied in the field of preparation of porous PtAgPt octahedron, can solve problems such as reduction, and achieve the effects of high catalytic activity, excellent lasting stability and simple preparation method.

Active Publication Date: 2016-06-01
常州扬鹏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formation of Pt-based alloys inevitably leads to the reduction of Pt active atoms on the surface of the catalyst. Therefore, an ideal Pt-based alloy catalyst should have a surface rich in Pt.

Method used

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  • Preparation method for porous PtAg@Pt octahedral nanoparticle
  • Preparation method for porous PtAg@Pt octahedral nanoparticle
  • Preparation method for porous PtAg@Pt octahedral nanoparticle

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A preparation method of porous PtAgPt octahedral nanoparticles, comprising the following steps:

[0038] (1) Add 0.5mL of 0.05MK to 7.5mL of water successively under the condition of continuous stirring 2 PtCl 4 , 0.5mL0.05MAgNO 3 and 1.0mL0.50M polyallylamine hydrochloride (PAH, molecular weight 150000) solution (note: the PAH concentration value is calculated by the monomer concentration), during the stirring process, the reaction in the mixed solution generates PAH-Pt II Complexes, Ag + and Cl – The reaction produces a precipitate of AgCl.

[0039] (2) To contain PAH-Pt II Add 0.5ml HCHO (40%wt aqueous solution, the same below) to the mixed solution of the complex and AgCl, and then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 180°C for 4h to make PAH-Pt II Complexes, AgCl precipitates react completely with HCHO, and after reduction, a Pt-Ag octahedral alloy is obtained. The product is centrifuged and washed to remov...

Embodiment 2

[0043] A preparation method of porous PtAgPt octahedral nanoparticles, comprising the following steps:

[0044] (1) Add 0.5mL of 0.05MK to 7.5mL of water successively under the condition of continuous stirring 2 PtCl 4 , 0.5mL0.05MAgNO 3 and 1.0mL0.50M polyallylamine hydrochloride (PAH, molecular weight 150000) solution, in the stirring process, the reaction in the mixed solution generates PAH-Pt II Complexes, Ag + and Cl – The reaction produces a precipitate of AgCl.

[0045] (2) To contain PAH-Pt II Add 0.5ml HCHO (40%wt aqueous solution, the same below) to the mixed solution of the complex and AgCl, and then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 180°C for 4h to make PAH-Pt II Complexes, AgCl precipitates react completely with HCHO, and after reduction, a Pt-Ag octahedral alloy is obtained. The product is centrifuged and washed to remove the surfactant PAH on the particle surface.

[0046] (3) Add 5mL of concentrated...

Embodiment 3

[0049] A preparation method of porous PtAgPt octahedral nanoparticles, comprising the following steps:

[0050] (1) Add 0.5mL of 0.05MK to 7.5mL of water successively under the condition of continuous stirring 2 PtCl 4 , 0.5mL0.05MAgNO 3 and 1.0mL0.50M polyallylamine hydrochloride (PAH, molecular weight 150000) solution, in the stirring process, the reaction in the mixed solution generates PAH-Pt II Complexes, Ag + and Cl – The reaction produces a precipitate of AgCl.

[0051] (2) To contain PAH-Pt II Add 0.5ml HCHO (40%wt aqueous solution, the same below) to the mixed solution of the complex and AgCl, and then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 180°C for 4h to make PAH-Pt II The complex, AgCl precipitate and HCHO react completely, and after reduction, a Pt-Ag octahedral alloy is obtained. The product is centrifuged and washed to remove the surfactant on the particle surface.

[0052] (3) Add 5 mL of concentrated ni...

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Abstract

The invention discloses a preparation method for a porous PtAg@Pt octahedral nanoparticle. Poly allyamine hydrochloride (PAH) is adopted as a complexing agent, a stabilizing agent and a morphology guide agent, and HCHO (40%) is adopted as a reducing agent; K2PtC14 and an AgNO3 precursor are jointly reduced into Pt-Ag octahedral alloy through a hydrothermal reduction method at one step; and after the obtained nanoparticle is centrifuged and washed, in the ultrasonic environment, concentrated nitric acid is added for etching, and therefore the porous PtAg@Pt octahedral nanostructure is obtained. According to the Pt-based alloy nanoparticle prepared through the method, due to the unique porous octahedral structure of PtAg@Pt, the nanoparticle shows high catalytic activity and stability on formic acid electrocatalytic oxidation (an FAOR) and can be applied to anode catalysts of fuel batteries.

Description

technical field [0001] The invention relates to a method for preparing a porous platinum-based octahedral alloy, in particular to a method for preparing a porous PtAgPt octahedron. The platinum-silver alloy nanoparticles exhibit high catalytic activity and excellent catalytic activity for formic acid oxidation (FAOR) as a catalyst. long-lasting stability. Background technique [0002] Direct formic acid fuel cells (DFAFCs) are promising energy sources for portable electronic devices and hybrid vehicles due to their high operating power density, low emissions, and low fuel permeation of polyelectrolyte membranes. It is well known that formic acid oxidation (FAOR) proceeds along two distinct pathways, including: the dehydrogenation pathway and the dehydration pathway. The dehydrogenation pathway mainly occurs at low potentials, and the main product is CO 2 And it can be easily detached from the catalyst surface, releasing more active sites for further electrocatalytic reacti...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0553B22F1/145B22F1/054
Inventor 唐亚文江娴付更涛孙冬梅徐林陈煜
Owner 常州扬鹏科技有限公司
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