Preparation method and application of a nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size

A nitrogen-doped carbon, nanoparticle technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problem of using environmentally unfriendly surfactants or chemical reagents, nitrogen-doped porous carbon Problems such as complex synthesis steps and unfavorable large-scale production

Active Publication Date: 2021-09-14
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, more toxic chemical reagents are used in the synthesis of low-order phenolic resin, which is harmful to the environment (patent application number: 201910361025.7)
Zhang Chengwei et al. used discarded cigarette butt filters as carbon and nitrogen sources to generate nitrogen-doped porous carbon materials in one step; then impregnated platinum salts and nickel salts, and gas-phase reduction to obtain high-performance nitrogen-doped porous carbon-supported PtNi alloy particles methanol fuel cell catalysts , but the synthesis steps of nitrogen-doped porous carbon are complicated, which is not conducive to large-scale production (patent application number: 201811001681.8)
[0005] In summary, the synthesis methods of alkaline hydroxide electrocatalysts in reported articles or nitrogen-doped carbon-supported nano-metal catalysts in reported patents often require the use of environmentally unfriendly surfactants or chemical reagents; the synthesis steps are complex Or the utilization rate of noble metal spherical nanoparticles is not high

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  • Preparation method and application of a nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size
  • Preparation method and application of a nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size
  • Preparation method and application of a nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size

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Experimental program
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Effect test

Embodiment 1

[0034]Platinum acetylacetonate (0.08mmol), ruthenium chloride (0.16mmol), 4,4'-dipyridine (80mg) were dispersed in ethanol (10ml), and a homogeneous solution was obtained by ultrasonication for 30min; the homogeneous solution was placed in a water bath, and the At 80°C, stirring promotes the Pt 2+ 、Ru 3+ Coordinate with 4,4'-bipyridine; then, add activated carbon (180mg) dispersed in ethanol (10ml) and ultrasonicate for 30min; stir and evaporate ethanol to dryness at 85°C to obtain a black mixture; after vacuum drying, After grinding, carbonize in an Ar atmosphere at 700 °C for 1 h; then switch the inert gas to ammonia to remove the precipitates attached to the surface of the metal particles, and finally obtain PtRu with uniform particle size of nitrogen-doped carbon 2 Metal spherical nanoparticle electrocatalysts;

[0035] Such as figure 1 , TEM results show that the obtained product is PtRu with uniform particle size supported by nitrogen-doped carbon 2 Nanospherical par...

Embodiment 2

[0040] Disperse platinum acetylacetonate (0.08mmol), ruthenium acetylacetonate (0.24mmol) and o-phenanthroline (150mg) in ethanol (8ml), and sonicate for 20min to obtain a homogeneous solution; Next, stirring prompts Pt 2+ 、Ru 3+ Coordinate with o-phenanthroline; then, add activated carbon (160mg) dispersed in ethanol (10ml), ultrasonic 30min; under the condition of 85°C, stir and evaporate the ethanol to obtain a black mixture; after vacuum drying and grinding, in N 2 Carbonization in the atmosphere at 600°C for 1.5h; then switch the inert gas to ammonia to remove the precipitates attached to the surface of the metal particles, and finally obtain PtRu with uniform particle size of nitrogen-doped carbon 3 Metal spherical nanoparticle electrocatalysts;

[0041] Such as Figure 5 , TEM results show that the obtained product is PtRu with uniform particle size supported by nitrogen-doped carbon 3 Spherical Nanoparticle Electrocatalysts.

[0042] Such as Figure 6 , accordin...

Embodiment 3

[0047] Platinum acetylacetonate (0.08mmol), nickel acetylacetonate (0.24mmol), and 2,2'-bipyridyl (300mg) were dispersed in ethanol (12ml), and a homogeneous solution was obtained by ultrasonication for 40min; the homogeneous solution was placed in a water bath, and the At 90°C, stirring promotes the Pt 2+ 、Ni 2+ Coordinate with 2,2'-bipyridine; then, add activated carbon (120mg) dispersed in ethanol (10ml), ultrasonicate for 30min; stir and evaporate ethanol to dryness at 90°C to obtain a black mixture; after vacuum drying, After grinding, at N 2 Carbonization in the atmosphere at 900°C for 20 minutes; then switch the inert gas to hydrogen to remove the precipitates attached to the surface of the metal particles, and finally obtain PtNi with uniform particle size supported by nitrogen-doped carbon 3 Metal spherical nanoparticle electrocatalysts;

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Abstract

The invention belongs to the technical field of metal electrocatalysts, and relates to a preparation method and application of a low-platinum metal spherical nanoparticle electrocatalyst with uniform nitrogen-doped carbon loading particle size. In the method, platinum metal salt, M metal salt, and nitrogen-containing ligand are dispersed in a solvent, and a homogeneous solution is obtained by ultrasonication; the homogeneous solution is placed in a water bath and stirred at 20-90°C; carbon carriers dispersed in the solvent are added, After ultrasonication, stir and evaporate the solvent at 20-120°C to obtain a black mixture; after drying and grinding, carbonize in an inert atmosphere at 200-1100°C for 0.1-3 hours; replace the inert gas with a reducing gas, etch and adhere The precipitate on the surface of the metal particles is obtained. The preparation method of the present invention does not need to use a surfactant, and the prepared nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size has high electrocatalytic activity, and is suitable for anode hydrogen in hydroxide exchange membrane fuel cells oxidation reaction.

Description

technical field [0001] The invention belongs to the technical field of metal electrocatalysts, and relates to a preparation method and application of a low-platinum metal spherical nanoparticle electrocatalyst with uniform nitrogen-doped carbon loading particle size. Background technique [0002] for H 2 -O 2 type hydroxide exchange membrane fuel cell, the cathode carries out the oxygen reduction reaction (1 / 2O 2 +H 2 O+2e - →2OH - ), the resulting OH - Passed through the hydroxide exchange membrane to the anode side. On the anode side fuel H 2 Complete the hydrogen oxidation reaction (H 2 +2OH - →2H 2 O+2e - ), making the fuel H 2 Convert chemical energy into electrical energy. In recent years, with the development of high-performance hydroxide exchange membranes and cathode ORR electrocatalysts, hydroxide exchange membrane fuel cells are expected to replace proton exchange membrane fuel cells and become the next generation of high-efficiency and low-cost energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92H01M8/083B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/921H01M4/926H01M8/083H01M2004/8684Y02E60/50Y02P70/50
Inventor 宋玉江丛媛媛柴春晓
Owner DALIAN UNIV OF TECH
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