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Catalyst based on varisized platinum-zinc nanoparticles loaded on zinc-containing monatomic carbon-nitrogen carrier, preparation method and application thereof

A platinum nanoparticle and nanoparticle technology is applied to catalysts based on platinum and zinc nanoparticles of different sizes supported on zinc-containing single-atom carbon-nitrogen carrier catalysts and their preparation and application fields, which can solve the problems of short life and high catalyst toxicity, and achieve low Platinum loading, high catalytic activity, effect of reducing commercial cost

Pending Publication Date: 2020-09-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, the primary restrictive factors for the development of ozone production by electrolysis of water are the problems of high catalyst toxicity and short service life.

Method used

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  • Catalyst based on varisized platinum-zinc nanoparticles loaded on zinc-containing monatomic carbon-nitrogen carrier, preparation method and application thereof
  • Catalyst based on varisized platinum-zinc nanoparticles loaded on zinc-containing monatomic carbon-nitrogen carrier, preparation method and application thereof
  • Catalyst based on varisized platinum-zinc nanoparticles loaded on zinc-containing monatomic carbon-nitrogen carrier, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]The preparation of a catalyst based on 2.2 nm platinum-zinc nanoparticles supported on a zinc-containing single-atom carbon-nitrogen carrier comprises the following steps:

[0033] 1) Add 3.25 mL of ethylene glycol solution containing NaOH (the mass of NaOH is 62.5 mg) to 3 mL containing H 2 PtCl 6 ·6H 2 O(H 2 PtCl 6 ·6H 2 O mass is 0.0625 g) in ethylene glycol solution. Under nitrogen blowing conditions, the mixture was heated to 160 °C and stirred at constant temperature for 3 h. After cooling at room temperature, 1 mL of 2 M HCl solution was added to obtain platinum nanoparticles, and the precipitate was obtained by centrifugation and dispersed in 20 mL of methanol solution containing 3 mg of PVP (Mw = 24000, the same below), and finally the platinum-containing Methanol suspension of nanoparticles (platinum nanoparticles solubility is approximately 1.17 mg / mL).

[0034] 2) Take 20 mL of the suspension containing platinum nanoparticles obtained in step 1), add i...

Embodiment 2

[0041] The preparation of a catalyst based on 3.7 nm platinum-zinc nanoparticles loaded on a zinc-containing single-atom carbon-nitrogen carrier comprises the following steps:

[0042] 1) Dilute 20 mL H 2 PtCl 6 ·6H 2 O (concentration of 6.0 mM) aqueous solution was added to 180 mL of methanol solution containing 533 mg of PVP, and the mixture was heated to 100 °C under a nitrogen atmosphere and kept stirring at constant temperature for 3 h. Finally, the resulting mixture was cooled to room temperature, and the volume of the mixture was evaporated to 10 mL by rotary evaporation. The evaporation residue was added to excess acetone to obtain a precipitate, and finally the precipitate was dispersed in 20 mL of methanol to obtain a methanol suspension containing platinum nanoparticles (the solubility of platinum nanoparticles was about 1.17 mg / mL).

[0043] 2) Take 20 mL of the suspension containing platinum nanoparticles obtained in step 1), add it to 20 mL of methanol solutio...

Embodiment 3

[0051] The preparation of a catalyst based on 4.5 nm platinum-zinc nanoparticles supported on a zinc-containing single-atom carbon-nitrogen carrier comprises the following steps:

[0052] 1) Take 20 mL of the suspension containing platinum nanoparticles freshly prepared in step 1 of Example 2, add to 170 mL methanol solution and 10 mL H 2 PtCl 6 ·6H 2 O (concentration: 6.0 mM) aqueous solution, the mixture was heated to 100 °C under nitrogen atmosphere and kept stirring at constant temperature for 3 h. Finally the resulting mixture was cooled to room temperature and the volume of the mixture was evaporated to 10 mL by rotary evaporation. The evaporation residue was added to excess acetone to obtain a precipitate, which was finally dispersed in methanol to obtain a suspension containing platinum nanoparticles (the solubility of platinum nanoparticles was about 1.17 mg / mL).

[0053] 2) Take 20 mL of the suspension containing platinum nanoparticles obtained in step 1), add it ...

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Abstract

The invention discloses a catalyst based on varisized platinum-zinc nanoparticles loaded on a zinc-containing monatomic carbon-nitrogen carrier, a preparation method and application thereof. The preparation method of the catalyst comprises the following steps of: preparing platinum nanoparticles with different sizes by using an alcohol reduction method, then encapsulating the prepared platinum nanoparticles in a metal organic framework, modifying the metal organic framework by using a surfactant, and then performing calcining at high temperature. At a certain temperature, the influence of thenanoparticle size on the reaction is explored, and at 600-900DEG C, the influence of the calcination temperature on the monatomic content and on the nanoparticle reaction is explored. The catalyst provided by the invention is low in preparation cost, has excellent electrocatalytic activity, super-strong stability and methanol resistance in an electrochemical oxygen reduction reaction, and obviously improves the electrochemical oxygen reduction activity and stability.

Description

technical field [0001] The invention relates to a zinc-containing single-atom carbon-nitrogen carrier catalyst based on platinum-zinc nanoparticles of different sizes, and a preparation method and application thereof. Background technique [0002] In recent years, more and more researchers have begun to pay attention to and study the topic of electrochemical oxygen reduction. O=O bond breaking needs to be overcome during cathodic reduction, which requires a high reaction energy barrier. At present, there are mainly catalysts such as platinum and platinum alloys with good electrochemical oxygen reduction catalysts. However, such catalysts have problems such as high cost, low stability, and weak toxicity resistance. In addition to noble metal platinum and its alloy catalysts, some transition metals (Fe, Co, Zn, Ni) also show good oxygen reduction performance, but their catalytic activity and durability need to be further optimized. At present, transition metal single-atom c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/60C25B1/13C25B11/06
CPCB01J27/24B01J23/60C25B1/13B01J35/393B01J35/23B01J35/33
Inventor 钟兴袁博文王建国
Owner ZHEJIANG UNIV OF TECH
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