Dendritic nanowire catalyst carrier with metal oxide/carbon core-sheath structure and preparation method of supported catalyst

A catalyst carrier, metal nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of poor stability, high cost, poor catalyst performance, etc., to improve stability, The effect of solving poor conductivity and improving catalytic activity

Inactive Publication Date: 2015-11-11

HARBIN INST OF TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of poor catalyst performance, high cost and poor stability in existing fuel cell catalysts, and provides a dendritic na...

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Abstract

The invention discloses a dendritic nanowire catalyst carrier with metal oxide/carbon core-sheath structure and a preparation method of a supported catalyst. The catalyst carrier is dendritic nanowires with the core-sheath structure; according to the core-sheath structure, the metal oxide is adopted as an inner core; and carbon is adopted as an outer sheath. The preparation method comprises the following steps: (1), preparing a uniform and transparent reactant solution; (2), carrying out solvothermal reaction; (3), centrifugally washing and drying the obtained product; and (4), coating the obtained product with a carbon sheath. The dendritic nanowire catalyst carrier with the metal oxide/carbon the core-sheath structure and the preparation method of supported metal nanoparticles disclosed by the invention are simple to operate and easy to control; a template is not needed in the preparation process; ordinary precursors such as chlorate and nitrate can be utilized; a metal organic compound required for preparation of the catalyst with a special structure is avoided; and the cost is further reduced.

Application Domain

Material nanotechnologyCell electrodes

Technology Topic

ChemistryNanometre +10

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Examples

Experimental program(11)
Effect test(1)

Example Embodiment

[0028] Specific embodiment 1: The metal oxide/carbon dendritic nanowire with a core-sheath structure provided in this embodiment is a dendritic nanowire catalyst carrier with a metal oxide/carbon core-sheath structure with a uniform diameter, and the nanowire The diameter is 3-200nm, and the thickness of the carbon sheath is 0.5-20nm.

[0029] The dendritic nanowire catalyst carrier of the metal oxide/carbon core sheath structure described in this embodiment has a unique nanowire structure, and this special shape has a relatively high active area, and the diameter of the nanowire and the thickness of the carbon sheath can be effectively adjusted. regulation, its TEM image is shown in Figure 2-3 shown.

Example Embodiment

[0030] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the metal oxide can be an oxide or a metal-doped oxide, and the doped metal is Pt, Pd, Ru, Os , Rh, Ir, Ag, Au, Re, Cr, Fe, Mn, Co, Ni, Cu, Zn, In, Sn and Sb or one or more of them, the doping ratio is 0.1~40wt.%; metal Oxide is Al 2 o 3 , Ga 2 o 3 , SiO 2 、GeO 2 、TiO 2 , ZrO 2 , V 2 o 5 、Cr 2 o 3 , MnO 2 , Fe 2 o 3 , Fe 3 o 4 、Co 2 o 3 , NiO, CuO, ZnO, Nb 2 o 5 、MoO 3 , RuO 2 、In 2 o 3 , SnO 2 , Sb 2 o 3 , Sb 2 o 5 , Tl 2 o 3 , PbO, Bi 2 o 3 , La 2 o 3 、 Ta 2 o 5 、WO 2 、WO 3 、 Bi 2 o 3 and CeO 2 One of.

Example Embodiment

[0031] Specific embodiment three: This embodiment provides a method for preparing a dendritic nanowire catalyst carrier with a metal oxide/carbon core sheath structure, which is specifically completed in the following steps:

[0032]1. Prepare a uniform and transparent reactant solution: stir the oxide precursor (or the mixed solution of the oxide precursor and the metal dopant precursor) and the acid solution at a stirring speed of 100~1000rpm for 10~120min and disperse in the multi-component In the alcohol, the molar ratio of the metal dopant precursor and the oxide precursor in the mixed solution is controlled to be 0.001-0.3, the concentration of the metal precursor is 10-100mmoL/L, and the acid concentration is 0.01-1moL/L.

[0033] 2. Solvothermal reaction: put the mixed solution in a high-pressure reactor for reaction, control the reaction temperature at 120~300°C, and the reaction time is 0.5~15h. After the reaction is completed, it is naturally cooled to room temperature.

[0034] 3. Centrifugal washing and drying: Centrifuge at a speed of 2000~15000rpm for 10~30min to obtain a solid product, and use a mixed solution of ethanol and deionized water to centrifugally wash the product for 3~10 times at a temperature of 50~120°C Dry under vacuum for 3-12 hours to obtain oxide or metal-doped oxide nanowires with a dendrite structure.

[0035] 4. Coated carbon sheath:

[0036] (1) Carbon encapsulation by hydrothermal method: Mix metal oxide nanowires with dendritic structure and organic solution at a mass ratio of 10-30:100, and stir at a stirring speed of 100-1000rpm for 10-120min to obtain well-dispersed Suspension; transfer the dispersed suspension to the reaction kettle, and react at 120-300°C for 3-10 hours; after the reaction, cool the material to room temperature and filter, and rinse with water and ethanol successively; wash the Dry the materials at 80-120°C for 3-6 hours under vacuum or inert environment;

[0037] (2) Carbon-encapsulated by chemical vapor deposition: heat up the metal oxide nanowires with a dendritic structure to 400-900°C, and continuously feed organic compound gas at a flow rate of 0.2-10L/min to carry out chemical vapor deposition-coated carbon for 10~ After 120 minutes, a dendritic nanowire catalyst carrier with a metal oxide/carbon core-sheath structure covered by chemical vapor deposition was obtained.

[0038] The molar ratio of polyol to acid in step 1 is (200-4000):1.

[0039] The ratio of the amount of the polyol to the oxide precursor described in step 1 is (800-1200):1.

[0040] The volume ratio of the mixed solution of ethanol and deionized water in step 3 is (1-3):1.

[0041] In the dendritic nanowire catalyst support with a metal oxide/carbon core-sheath structure described in this embodiment, the metal doping therein can change the electronic structure and geometric structure of the oxide.

[0042] The winding nanowire-shaped metal composite oxide nanocatalyst described in this embodiment has a unique metal composite oxide winding nanowire structure. This special shape has a high active area, and the diameter of the nanowire and the thickness of the carbon sheath can be effectively adjusted. regulation.

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PUM

Property	Measurement	Unit
Diameter	3.0 ~ 200.0	nm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Dendritic nanowire catalyst carrier with metal oxide/carbon core-sheath structure and preparation method of supported catalyst

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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