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Dendritic PdPt nanoparticle for electrocatalytic methanol oxidization and preparation method of dendritic PdPt nanoparticle

A methanol oxidation and nanoparticle technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of large particle size of precious metals, difficult process control, and particle shape damage, etc., and achieve easy Preparation, low cost, and the effect of improving catalytic performance

Active Publication Date: 2019-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The template method generally requires the preparation of the template in the early stage and the removal of the template in the later stage, and it is easy to cause damage to the particle shape during the template removal process. The process is cumbersome and the operation is complicated.
The size of noble metal particles prepared by electrodeposition is relatively large, generally in the micron or micro / nano scale, and the process is difficult to control and the repeatability is poor

Method used

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  • Dendritic PdPt nanoparticle for electrocatalytic methanol oxidization and preparation method of dendritic PdPt nanoparticle
  • Dendritic PdPt nanoparticle for electrocatalytic methanol oxidization and preparation method of dendritic PdPt nanoparticle
  • Dendritic PdPt nanoparticle for electrocatalytic methanol oxidization and preparation method of dendritic PdPt nanoparticle

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Embodiment 1

[0026] 1) Mix palladium salt (palladium chloride powder with a mass fraction of 99% (Pd% is 59%)) and hydrochloric acid (hydrogen chloride) in a molar ratio of 1:2 to obtain a palladium precursor solution with a concentration of 10 mM;

[0027] 2) Weigh 0.085g of tannic acid, drop into 1mL 10mM palladium precursor aqueous solution, 3mL 5mM chloroplatinic acid aqueous solution and 26mL deionized water in sequence, the dropping rate is 8 drops / min, and the total volume is 30mL;

[0028] 3) The mixed solution obtained in step 2) was continuously stirred at room temperature for 15 minutes, then transferred to a stainless steel autoclave, heated at 120 °C for 6 hours, cooled to room temperature in a furnace, and the cooling rate was 3 °C / min to obtain a black mixed solution ;

[0029] 4) The mixed solution obtained in step 3) is centrifuged at 18,000 rpm for 10 min by a centrifuge, and washed with a mixture of deionized water and ethanol to finally obtain dendritic Pd 52 Pt 48 na...

Embodiment 2

[0033] 1) Mix palladium salt (palladium chloride powder with a mass fraction of 99% (Pd% is 59%)) and hydrochloric acid in a molar ratio of 1:2 to obtain a palladium precursor solution with a concentration of 10mM;

[0034] 2) Weigh 0.102g of tannic acid, drop into 0.5mL 10mM palladium precursor solution, 4mL 5mM chloroplatinic acid solution and 25.5mL deionized water in sequence, the dropping rate is 5 drops / min, and the total volume is 30mL;

[0035] 3) The mixed solution obtained in step 2) was continuously stirred at room temperature for 12 minutes, then transferred to a stainless steel autoclave, heated at 150°C for 4h, and cooled to room temperature in a furnace at a cooling rate of 5°C / min to obtain a black mixed solution ;

[0036] 4) The mixed solution obtained in step 3) is centrifuged at 15,000 rpm for 12 min by a centrifuge, and washed with a mixture of deionized water and ethanol to finally obtain dendritic Pd 36 Pt 64 nanoparticles.

[0037] Figure 4 For the...

Embodiment 3

[0039] 1) Mix palladium salt (palladium chloride powder with a mass fraction of 99% (Pd% is 59%)) and hydrochloric acid in a molar ratio of 1:2 to obtain a palladium precursor solution with a concentration of 10mM;

[0040] 2) Weigh 0.077g of tannic acid, drop into 1.5mL 10mM palladium precursor solution, 2mL 5mM chloroplatinic acid solution and 26.5mL deionized water in sequence, the dropping rate is 10 drops / min, and the total volume is 30mL;

[0041] 3) The mixed solution obtained in step 2) was continuously stirred at room temperature for 18 minutes, then transferred to a stainless steel autoclave, heated at 100°C for 8h, and cooled to room temperature by furnace cooling at a cooling rate of 1°C / min to obtain a black mixed solution ;

[0042] 4) The mixed solution obtained in step 3) was centrifuged at 20,000 rpm for 8 min by a centrifuge, and washed with a mixture of deionized water and ethanol to finally obtain dendritic Pd 69 Pt 31 nanoparticles.

[0043] Figure 5 ...

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Abstract

The invention provides dendritic PdPt nanoparticle for electrocatalytic methanol oxidization and a preparation method of the dendritic PdPt nanoparticle. The preparation method comprises the steps offirstly, mixing a palladium salt and hydrochloric acid with certain concentration according to a certain proportion to obtain a palladium precursor solution; secondly, weighing a certain amount of tannic acid, dropwise adding the palladium precursor solution, a chloroplatinic acid solution and deionized water according to a sequence; and finally, continuously stirring the mixture for certain timeunder a room temperature, transferring to a stainless steel high-pressure reaction kettle, and centrifugally cleaning the product after hydrothermal reaction to obtain the dendritic PdPt nanoparticle.The preparation method has the advantages of high repeatability, constituent controllability, safety and environmental friendliness and is simple and convenient, and the prepared dendritic PdPt nanoparticle has excellent electrocatalytic methanol oxidization performance.

Description

technical field [0001] The invention relates to the field of new energy functional materials, and more specifically relates to a preparation method of an electrocatalytic methanol oxidation catalyst with simple process, easy operation and good repeatability. Background technique [0002] As the most widely used nano-precious metal platinum catalyst in fuel cells, its commercial application is greatly limited due to its lack of resources and high price. It has a wide range of applications in coupling reactions and other aspects, and as a catalyst for fuel cells, it also has very good performance, so platinum-based catalysts have become very potential, and can replace platinum or even be better than it in some catalytic reactions. Catalyst selection. Therefore, the preparation of nano-Pt-based particles with high catalytic activity is a current research hotspot. Due to the synergy between metals (geometric effect and electronic effect), the introduction of a second metal bec...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/921H01M4/928H01M8/1011Y02E60/50
Inventor 邓意达张媛胡文彬张金凤何宇钟澄韩晓鹏
Owner TIANJIN UNIV
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