Nanoparticle catalyst with ultrathin platinum metal layer and preparation method of of nanoparticle catalyst

A platinum group metal, nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of time-consuming, unsuitable for industrialization, and achieve high safety, easy operation and scale-up The effect of mild production and reaction conditions

Pending Publication Date: 2022-01-21
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not only time-consuming, but also unsuitable for industrialization

Method used

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  • Nanoparticle catalyst with ultrathin platinum metal layer and preparation method of of nanoparticle catalyst
  • Nanoparticle catalyst with ultrathin platinum metal layer and preparation method of of nanoparticle catalyst
  • Nanoparticle catalyst with ultrathin platinum metal layer and preparation method of of nanoparticle catalyst

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preparation example Construction

[0037] The preparation method of polyvinylpyrrolidone-modified palladium cubes: add 105mgPVP, 600mg potassium bromide and 60mg ascorbic acid into 8mL deionized water at 80°C, then add 3mL 19mg / mL sodium chloropalladate aqueous solution, react for 3 hours and collect by centrifugation Finally, polyvinylpyrrolidone-modified palladium cubes are obtained.

[0038] The preparation method of polyvinylpyrrolidone-modified palladium octahedron: add 105mgPVP to 7mL deionized water at 80°C, add 0.1mL formaldehyde and 0.34mL palladium cube obtained above in advance, and then add 3mL 10mg / mL sodium chloropalladate The aqueous solution was reacted in deionized water at 60°C for 3 hours and collected by centrifugation.

[0039] Preparation method of polyvinylpyrrolidone-modified palladium icosahedron: add 1 mL of 15.5 mg / mL sodium chloropalladate solution to 2 mL of 80 mg / mL PVP ethylene glycol solution, and react at 130° C. for 1 h. Then collected by centrifugation.

Embodiment 1

[0040] Example 1: Preparation of Nanoparticle Catalysts with Ultrathin Iridium Nanolayers

[0041]1. Disperse polyvinylpyrrolidone-modified palladium octahedra with a particle size of 12nm in ethylene glycol to prepare a 1.8mg / mL solution, take 0.3mL of the solution, 50mg PVP, and 50mg KBr and disperse them in 7mL triethylene diethylene glycol Alcohol, ultrasonically mixed thoroughly. The solution was heated to 180°C and kept stirring for 30 min.

[0042] 2. Dissolve iridium chloride in ethylene glycol solution and prepare a solution with a concentration of 4mg / mL, take 0.123mL of the solution and add it to the above solution at 180°C, and react for 4h.

[0043] 3. After the reaction time ends, wash 3 times with ultrapure water and acetone, and dry to obtain the nanoparticle catalyst of the ultrathin iridium nano-layer after being centrifuged at 17500 rpm.

Embodiment 2

[0044] Example 2: Preparation of Nanoparticle Catalysts with Ultrathin Iridium Nanolayers

[0045] 1. Disperse polyvinylpyrrolidone-modified palladium cubes with a particle size of 53nm in diethylene glycol to prepare a 2.4mg / mL solution, take 0.2mL of the solution, 150mg PVP, and 100mg KBr and disperse them in 7mL tetraethylene glycol Alcohol, ultrasonically mixed thoroughly. The solution was heated to 190°C and kept stirring for 30 min.

[0046] 2. Dissolve sodium hexachloroiridate in ethylene glycol solution and make a solution with a concentration of 4mg / mL, take 0.221mL of the solution and add it to the above solution at 190°C, and react for 7h.

[0047] 3. After the reaction time ends, wash 3 times with ultrapure water and acetone, and dry to obtain the nanoparticle catalyst of the ultrathin iridium nano-layer after being centrifuged at 17500 rpm.

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Abstract

The invention discloses a nanoparticle catalyst with an ultrathin platinum metal layer and a preparation method of the nanoparticle catalyst, and belongs to the technical field of nano material preparation. The invention particularly relates to a simple, rapid and one-step synthesis method of ultrathin platinum metal layer nanoparticles with efficient catalytic performance. According to the invention, polyvinylpyrrolidone is used as an end-capping reagent, organic solvents such as triethylene glycol and tetraethylene glycol are used as a solvent and a reducing agent, and potassium bromide or iodine bromide is used as a synthesis blocking agent for platinum metal layer nanoparticles with efficient catalytic activity. The nanometer material with the platinum metal layer and high catalytic activity is synthesized in a green, simple, convenient and rapid hydrothermal synthesis mode, the catalytic activity of the nanometer material is remarkably higher than that of a commercial catalyst, the stability is good, and the catalytic effect is not remarkably changed after the nanometer material is placed for 9 months or above.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a nanoparticle catalyst with an ultrathin platinum group metal layer and a preparation method thereof. Background technique [0002] Proton exchange membrane electrolyzers offer an efficient route for clean and sustainable energy conversion and storage, but the slow kinetics of the oxygen evolution reaction and the highly corrosive environment associated with such devices have greatly hindered the commercialization of this technology. Therefore, highly efficient and long-lived oxygen evolution reaction electrocatalysts are expected to address these issues. Iridium, an extremely rare element in the earth's crust, is considered a key component of the most effective oxygen evolution reaction electrocatalysts due to its optimal balance of activity and stability in acidic media. Since the scarcity of iridium greatly increases its cost as an electrocatalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCH01M4/8825H01M4/921B82Y30/00Y02E60/50
Inventor 朱佳伟蒋逸鸣李禹锡陈明法
Owner JIANGNAN UNIV
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