Supported platinum-based catalyst as well as preparation and application thereof

A catalyst, supported technology, applied in the field of nanomaterials, can solve the problems of reduced MOR, EOR or ORR activity, increased catalyst preparation time and cost, electrocatalyst cost and technical difficulties, etc., to avoid formation, agglomeration, and production costs. Low, mild effects

Active Publication Date: 2022-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, these electrocatalyst synthesis methods require long reaction time (hours to one day), specific environmental conditions (argon or nitrogen atmosphere, high temperature and high pressure, etc.), toxic reagents, and high-temperature quenching reactions, etc., making the synthesis of electrocatalysts Facing cost and technical challenges
In particular, the widely used synthetic method based on surfactants has shown that organic macromolecules are easily adsorbed on the surface of Pt-based nanocatalyst particles, occupying the active sites required for catalytic reactions, resulting in reduced MOR, EOR or ORR activity.
Moreover, it is difficult to remove organic macromolecules by ordinary water washing, which usually requires multiple washings with special solvents or high-temperature heat treatment. The above process will not only increase the time and cost of catalyst preparation, but also cause the aggregation of PtM nanoparticles and reduce the utilization rate of precious metal Pt.

Method used

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  • Supported platinum-based catalyst as well as preparation and application thereof
  • Supported platinum-based catalyst as well as preparation and application thereof
  • Supported platinum-based catalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 PtCu / C nanocatalyst

[0034] Weigh 40 mg of XC-72 carbon carrier, disperse it in a 200 mL beaker containing 50 mL of ethanol, ultrasonicate for 30 minutes, and stir for 30 minutes to fully disperse the carbon carrier to form a slurry. Pipette 1.67mL of H 2 PtCl 6 ·6H 2 O ethanol solution (6 mg / mL) and 15 mL of Cu(acac) 3 Ethanol solution (0.05 mM) was successively added to a 200 mL beaker filled with carbon slurry, stirred at a stirring rate of 600 rpm for 1 h, and then sonicated for 3 hours. After the metal salt was uniformly impregnated, 20 mL of sodium borohydride ethanol solution (0.1 mmol / mL) was added to the above system at a drop rate of 0.2 mL / min. The reaction was stopped after 2 hours of reaction. The reacted mixture was transferred to a centrifuge test tube, centrifuged to obtain a solid product, washed twice with water and ethanol, and dried in a vacuum oven at 80°C for 18 hours to obtain a PtCu / C nanocatalyst. Thermogravimetric analysis show...

Embodiment 2

[0036] Example 2 Pt 10 Cu / C nanocatalyst

[0037] The operation process and conditions are the same as in Example 1. The difference between this example and Example 1 is that the amount of Cu precursor is changed, and the molar ratio of Pt and Cu in this example is 10:1. The Pt 10 Cu / C catalysts have catalytic activity for MOR.

Embodiment 3

[0038] Example 3 Pt 5 Cu / C nanocatalyst

[0039] The operation process and conditions are the same as in Example 1. The difference between this example and Example 1 is that the amount of Cu precursor is changed, and the molar ratio of Pt and Cu in this example is 5:1. The Pt 5 Cu / C catalyst has catalytic activity for MOR

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Abstract

According to the supported platinum-based nano catalyst, the second component metal is one or more than two of nickel, cobalt, copper, ruthenium, palladium, iridium and gold, and the molar ratio of platinum to the second component metal is 10: 1-1: 3; the total mass of the platinum and the second component metal in the catalyst accounts for 20-60% of the total mass of the catalyst. The preparation method of the catalyst comprises the following steps: dipping a prepared precursor solution, reducing, washing and drying. The catalyst is applied as a C1-C5 organic micromolecule electrochemical oxidation catalyst or an oxygen reduction reaction catalyst.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and specifically, the invention relates to a supported platinum-based single-component or multi-component nanocatalyst; the invention also relates to a preparation method and application of the above catalyst. Background technique [0002] Direct alcohol fuel cell (DAFC) is an energy conversion device that directly converts the chemical energy of alcohol fuel into electrical energy. It has the advantages of high energy conversion efficiency, high theoretical energy density, and convenient fuel storage and carrying. It has broad application prospects in military and civilian fields such as power supply for electronic products and decentralized power stations. Electrocatalyst is one of the key materials of DAFC, and its activity and stability directly affect the discharge performance and service life of the battery. Pt / C (cathode) and PtRu / C (anode) noble metal electrocatalysts are still commonly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/02B01J35/10
CPCB01J23/8926B01J35/026B01J35/1004B01J35/0033B01J35/1028B01J35/1023B01J35/1019B01J35/1014Y02E60/50
Inventor 王素力张晓明孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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