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Preparation method for carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst by chemical reduction method

A network structure, carbon nanotube technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as low stability and easy agglomeration of catalysts, achieve catalytic performance improvement, synthesis Simple method and low equipment requirements

Active Publication Date: 2017-04-26
KUNMING UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

[0003] The present invention aims at the existing problems and deficiencies of existing fuel cell catalysts such as easy aggregation and low stability. The present invention provides a carbon nanotube-supported PtPd network structure nanowire catalyst (hereinafter referred to as "carbon nanowire catalyst") prepared by chemical reduction method. Nanotube-supported PtPd NWs catalyst") method

Method used

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  • Preparation method for carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst by chemical reduction method
  • Preparation method for carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst by chemical reduction method
  • Preparation method for carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst by chemical reduction method

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Embodiment 1

[0034] The use of chemical reduction method to prepare carbon nanotubes loaded with Pt 1 PD 1 The method for network structure nanowire catalyst, its specific steps are as follows:

[0035] (1) First soak 100mgMWCNTs in 20ml acetone for 3h, suction filter and wash with deionized water; then soak in alkaline solution (1.0mol / LKOH), ultrasonicate for 20min, stir for 5h, wash with deionized water, and finally add inorganic salts Solution (1.0mol / LNH 4 F solution) was stirred for 6 hours, washed with deionized water, filtered, vacuum-dried at constant temperature at 60°C for 24 hours, and naturally cooled to room temperature to obtain functionalized MWCNTs;

[0036] (2) Pt 1 PD 1 Synthesis of nanowires with network structure: Mix polyethylene glycol (24ml), chloropalladium acid solution (0.325mg / ml), and potassium chloroplatinate solution (2.34mg / ml) according to the volume ratio of 4:1:0.25. Then add the structure directing agent KBr solution (the concentration of KBr soluti...

Embodiment 2

[0042] The use of chemical reduction method to prepare carbon nanotubes loaded with Pt 2 PD 1 The method for network structure nanowire catalyst, its specific steps are as follows:

[0043] (1) First soak 100mgMWCNTs in 20ml acetone for 3h, suction filter and wash with deionized water; then soak in alkaline solution (1.0mol / LKOH), ultrasonicate for 20min, stir for 5h, wash with deionized water, and finally add inorganic salts Solution (1.0mol / LNH 4 F solution) was stirred for 6 hours, washed with deionized water, filtered, vacuum-dried at constant temperature at 60°C for 24 hours, and naturally cooled to room temperature to obtain functionalized MWCNTs;

[0044] (2) Pt 2 PD 1 Synthesis of nanowires with network structure: Mix polyethylene glycol (24ml), chloropalladium acid solution (0.325mg / ml), and potassium chloroplatinate solution (2.34mg / ml) according to the volume ratio of 4:1:0.5. Then add KBr solution (the concentration of KBr solution is 0.1mol / L, and the additio...

Embodiment 3

[0048] The use of chemical reduction method to prepare carbon nanotubes loaded with Pt 1 PD 2 The method for network structure nanowire catalyst, its specific steps are as follows:

[0049] (1) Firstly soak 100mgMWCNTs in 20ml acetone for 3 hours, suction filter and wash with deionized water; then soak in alkaline solution (1.0mol / LKOH), sonicate for 20min, stir for 5h, wash with deionized water, and finally add to inorganic Salt solution (1.0mol / LNH 4 F solution) was stirred for 6 hours, washed with deionized water, filtered, vacuum-dried at constant temperature at 60°C for 24 hours, and naturally cooled to room temperature to obtain functionalized MWCNTs;

[0050] (2) Pt 1 PD 2 Synthesis of nanowires with network structure: Mix polyethylene glycol (24ml), chloropalladium acid solution (0.325mg / ml), and potassium chloroplatinate solution (2.34mg / ml) according to the volume ratio of 4:2:0.25. Then add KBr solution (the concentration of KBr solution is 0.1mol / L, the additi...

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Abstract

The invention relates to a preparation method for a carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst by a chemical reduction method, and belongs to the preparation technical field of a catalyst. The preparation method comprises the steps of performing functionlization processing on carbon nanotubes (MWCNTs); uniformly mixing polyethylene glycol, a chloropalladic acid and a potassium chloroplatinate solution, adding a KBr solution to be used as a structural guiding agent, stirring uniformly, and adding a sodium borohydride solution to the mixed solution to react for 15-50min to obtain net-shape-structured PtPd nanowires; and performing preparation of the carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst: mixing the functionalized MWCNTs and the prepared PtPd net-shape-structured nanowires, then adding ethyl alcohol, performing ultrasonic processing in an ultrasonic condition for 10-30min, next, continuously stirring, vacuum filtering, washing by deionized water, vacuum drying, and naturally cooling to room temperature to obtain the carbon nanotube-loaded PtPd net-shape-structured nanowire catalyst. The dual-metal catalyst prepared by the method has the special one-dimensional net-shaped structure, so that the catalysis activity and stability are improved.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube-loaded PtPd network structure nanowire catalyst by using a chemical reduction method, and belongs to the technical field of catalyst preparation. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy of fuel into electrical energy. It is not limited by the Carnot cycle during use, so its energy conversion efficiency is high. Due to the advantages of simple structure, low working temperature, high energy conversion efficiency, low noise and almost zero pollution, low-temperature fuel cells have attracted great attention and developed rapidly. So far, Pt is still the fuel cell anode catalyst with the best catalytic activity. However, Pt is expensive and easily produces intermediates such as CO in the catalytic process, causing catalyst poisoning, which greatly reduces the catalytic activity and stability of Pt-based catalysts. ...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCH01M4/921H01M4/926B82Y30/00B82Y40/00Y02E60/50
Inventor 徐明丽靳振华张英杰董鹏吉金梅杨喜昆
Owner KUNMING UNIV OF SCI & TECH
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