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Nano platinum-rare earth alloy as well as preparation method and application thereof

A nano-platinum and nano-technology, applied in the field of electrochemistry, can solve the problems of fixed reduction ability and difficult co-reduction, etc., and achieve the effect of good catalytic activity and stability, uniform size and good crystallinity.

Pending Publication Date: 2022-02-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to use high-temperature molten salt as the medium to prepare low-nanometer-scale platinum-rare earth (Pt-RE) alloy materials by molten salt electro-deoxidation method, which solves the problems in the prior art: firstly, the Pt-RE alloy is solved The problem of co-reduction is difficult due to too large potential difference; secondly, the reduction ability can be adjusted by changing the applied voltage, which solves the problem of fixed reduction ability, so that the composition of the obtained product can be adjusted; third, high dispersion, low Nanoscale Pt-RE alloys; fourth, by increasing the molar ratio of rare earth elements to platinum elements in rare earth oxides and synergistically controlling the electrolysis voltage, the aggregation and growth of platinum rare earth alloy particles can be prevented; fifth, gram-level , kilograms, hundreds of kilograms and other scale products; sixth, environmentally friendly, no pollutants or toxic substances produced

Method used

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  • Nano platinum-rare earth alloy as well as preparation method and application thereof
  • Nano platinum-rare earth alloy as well as preparation method and application thereof
  • Nano platinum-rare earth alloy as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: Pt 5 Preparation of Nd / C Nanoalloy

[0052] (1) Preparation of nano-precursor: Weigh carbon black (Vulcan XC-72R) with a mass of 145 mg, 4 The solution (73 mg) was ultrasonically mixed and magnetically stirred for 30 min each. Then Nd(NO 3 ) 3 ·6H 2 O (845mg) and 0.0193mol L -1 H 2 PtCl 6 ·6H 2 O solution 10ml, stirred vigorously for 1h. Ammonia water was added to ensure the pH of the solution was 10, and magnetic stirring was continued for 1 h. Filtrate and wash until the last filtrate is neutral, dry it in vacuum at 80°C, grind it into powder carefully and put it under N 2 Calcined at 700°C for 2 hours in the atmosphere;

[0053] (2) cathode sheet preparation: under 15Mpa pressure, nano-Pt-Nd 2 o 3 / C The powder precursor is pressed into a sheet and connected to a conductor as a cathode;

[0054] (3) Preparation of the electrolysis experiment: The experiment uses a two-electrode system. The distance between electrodes was controlled to be con...

Embodiment 2

[0058] Example 2: Pt 2 Preparation of Nd / C Nanoalloy

[0059] (1) Preparation of nano-precursor: Weigh 145 mg of carbon black (Ketjen EC 300J) in 100 mL of ethylene glycol (C 2 h 6 o 2 ) in the solution by ultrasonic mixing and magnetic stirring for 30 min each. Then add NdCl to the well mixed slurry 3 (966mg) and 0.0193mol L -1 H 2 PtCl 6 ·6H 2 O solution 10ml, the homogeneously mixed slurry was incubated at 130°C for 3h. Aqueous ammonia was added dropwise to adjust the pH of the slurry to 11, and the stirring was continued for 1 h. Filtrate and wash until the last filtrate is neutral, dry it in vacuum at 90°C, grind it into powder carefully and put it under N 2 Calcined at 500°C for 4h in the atmosphere;

[0060] (2) cathode sheet preparation: under 10Mpa pressure, nano-Pt-Nd 2 o 3 The / C powder precursor is pressed into a cylindrical sheet and connected to a conductor as a cathode;

[0061] (3) Preparation of the electrolysis experiment: The experiment uses a ...

Embodiment 3

[0065] Example 3: Pt 3 Preparation of Dy / C Nanoalloy

[0066] (1) Preparation of nano-precursor: Weigh ordered mesoporous carbon (CMK-5) with a mass of 192 mg, 4 The solution (37 mg) was ultrasonically mixed and magnetically stirred for 30 min each. Then Dy(NO 3 ) 3 ·6H 2 O (88.1mg) and 0.0193mol L -1 H 2 PtCl 6 ·6H 2 O solution 10ml, stirred vigorously for 1h. Ammonia water was added to ensure the pH of the solution was 9, and magnetic stirring was continued for 1 h. Filtrate and wash until the last filtrate is neutral, dry it in vacuum at 80°C, grind it into powder carefully and put it under N 2 Calcination at 900°C for 1h in air;

[0067] (2) Preparation of cathode sheet: Pt-Dy under 20Mpa pressure 2 o 3 / C The powder precursor is pressed into a sheet and connected to a conductor as a cathode;

[0068] (3) Preparation of the electrolysis experiment: The experiment uses a two-electrode system. The distance between electrodes was controlled to be consistent in ...

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Abstract

The invention discloses a nano platinum-rare earth alloy catalyst as well as a preparation method and application thereof. The nano platinum-rare earth alloy catalyst is prepared through high-temperature molten salt electrochemical deoxidation. The preparation method comprises the following steps: A) preparing a nano precursor (Pt-RExOy / C); b) preparation of a cathode sheet (Pt-RExOy / C); c) preparation of a nano platinum-rare earth (Pt-RE) alloy material; and D) product treatment. The method is suitable for large-scale synthesis, low in energy consumption and free of pollution; and the prepared platinum-rare earth (Pt-RE) alloy material is ordered in structure, uniform in nanometer size, high in dispersion and good in catalytic stability and can be used as a proton exchange membrane fuel cell ORR catalyst.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for preparing a platinum-rare earth alloy by an electrochemical method. Background technique [0002] As a kind of fuel cell, proton exchange membrane fuel cell (PEMFC) has the advantages of safety and high efficiency, wide range of fuel sources and no pollution, and has been gradually applied in various energy fields. When hydrogen is used as fuel, the proton exchange membrane fuel cell realizes the conversion of chemical energy to electrical energy through the oxidation reaction of hydrogen at the anode and the reduction reaction of oxygen at the cathode. Both the anode and cathode reactions require the assistance of nano-platinum (Pt) catalysts Finish. At present, commercial nano-Pt / C catalysts are used for cathodic oxygen reduction reaction (ORR), and their activity and long-term stability are poor, resulting in the quality of platinum catalyst required for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92H01M4/90B82Y30/00
CPCH01M4/8825H01M4/921H01M4/926H01M4/9041H01M4/9083B82Y30/00H01M2004/8689Y02E60/50
Inventor 李冰范晨铭古京九
Owner EAST CHINA UNIV OF SCI & TECH
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