Carbon-coated metal nanocube material and its preparation method

A metal nano-cube technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve problems affecting the thickness and regularity of thin carbon layers, etc. Achieve the effect of controllable shell thickness, simple and easy method, and enhanced stability

Active Publication Date: 2017-12-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to obtain a thinner carbon layer, the solidification step can be omitted and sintered directly, but the sintering temperature will affect the thickness and regularity of the thin carbon layer

Method used

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  • Carbon-coated metal nanocube material and its preparation method
  • Carbon-coated metal nanocube material and its preparation method
  • Carbon-coated metal nanocube material and its preparation method

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[0033] The present invention also provides a method for preparing the above-mentioned carbon-coated metal nanocube material, comprising:

[0034] S1) mixing metal nanocubes and organosilicate in an alcohol solvent, then mixing and reacting with an alkaline solution, adding phenolic compounds and aldehyde compounds, mixing and reacting, and calcining to obtain carbon spheres;

[0035] S2) Corroding the carbon spheres with HF solution or hot lye to obtain carbon-coated metal nanocube materials.

[0036] The present invention coats silicon dioxide and phenolic resin on the surface of metal nanocubes in a solution in one step, and then calcines to obtain metal nanocubes coated with silicon dioxide and carbon layers, and finally uses an acid solution to remove the carbon dioxide inside the carbon layer. Silicon oxide is etched and removed to obtain a carbon-coated metal nanocube material. This method is simple and easy, and the thickness of the hollow carbon sphere shell is control...

Embodiment 1

[0052] 1.1 Synthesis of PtPd cubes. 1ml of K with a concentration of 20mmol / l 2 PtCl 4 solution and 1ml of Na at a concentration of 20mmol / l 2 PdCl 4 The solution was added to a 25ml polytetrafluoroethylene liner, followed by a solution of 0.075g NaI, 0.16g polyvinylpyrrolidone (PVP) and 10ml dimethylformamide (DMF). The mixed solution was ultrasonicated for half an hour, and the liner was added into the reaction kettle to react at 130°C for 5 hours. After cooling to room temperature, the sample was centrifuged at 10,000 rpm (acetone was used as a precipitating agent), washed and dispersed in a mixed solution of 1 ml of water and ethanol (1:1) for use.

[0053] 1.2 Synthesis of carbon-coated metal nanocube materials. Add 0.5ml of PtPd solution into 7.5ml of ethanol solution, and ultrasonicate for 10min. Add 0.1ml tetraethyl orthosilicate (TEOS) into the above solution and sonicate for 10min. Add the mixed solution into a 50ml round bottom flask containing 5ml ethanol, 1...

Embodiment 2

[0062] 2.1 Synthesis of PtPd cubes. 1ml of K with a concentration of 20mmol / l 2 PtCl 4 solution and 1ml of Na at a concentration of 20mmol / l 2 PdCl 4 The solution was added to a 25ml polytetrafluoroethylene liner, followed by 0.075g NaI, 0.16g PVP and 10ml dimethylformamide (DMF) solution. The mixed solution was ultrasonicated for half an hour, and the liner was added into the reaction kettle to react at 130°C for 5 hours. After cooling to room temperature, the sample was centrifuged at 10,000 rpm (acetone was used as a precipitating agent), washed and dispersed in a mixed solution of 1 ml of water and ethanol (1:1) for use.

[0063] 2.2 Synthesis of carbon-coated metal nanocube materials. Add 0.5ml of PtPd solution into 7.5ml of ethanol solution, and ultrasonicate for 10min. Add 0.1ml TEOS to the above solution and sonicate for 10min. Add the mixed solution into a 50ml round bottom flask containing 5ml ethanol, 1.5ml water and 0.5ml ammonia water, and stir at room temp...

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Abstract

The invention provides a carbon-coated metal nanocube material and a preparation method thereof. The preparation method comprises the following steps: S1) mixing a metal nanocube and organosilicate in an alcohol solvent, then subjecting the obtained mixture and an alkaline solution to a mixing reaction, adding a phenol compound and an aldehyde compound, carrying out a mixing reaction and then carrying out calcining so as to obtain a carbon sphere; and S2) subjecting the carbon sphere to corrosion with a HF solution or a hot alkaline solution to obtain the carbon-coated metal nanocube material. Compared with the prior art, the method provided by the invention has the following advantages: the surface of the metal nanocube is coated with silica and phenolic resin in a solution via a one-step process, then the metal nanocube coated by silica and a carbon layer is prepared through calcining, and silica in the carbon layer is removed through corrosion in an acid solution, so the method is simple and easily practicable, the thickness of the shell of the hollow carbon sphere is controllable, and the obtained carbon-coated metal nanocube material has abundant mesoporous structures, can provide fast electron conduction and inhibit the aggregation of metal nanocubes and is enhanced in stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a carbon-coated metal nano-cube material and a preparation method thereof. Background technique [0002] Compared with other alloys, platinum-palladium alloy has unique advantages. First of all, platinum-palladium alloy has strong corrosion resistance and higher stability than other alloys. Second, the lattice constants of platinum and palladium are very similar (0.77% mismatch), both of which are face-centered cubic structures. During the formation of platinum-palladium alloy, palladium will affect the electronic structure of platinum to form a platinum-palladium bond, which will increase the adsorption amount of oxygen on the surface of platinum and improve the oxygen reduction performance. Thirdly, the synergistic effect between platinum and palladium will make the catalytic effect of the alloy show better performance than that of single metal. [0003] With t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
CPCB01J21/18B01J23/44B01J35/006
Inventor 陈卫张春媚
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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