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Synthesis method of sub-five nanometer truncated octahedron PtCu nanocrystal

A technology of nanocrystals and synthesis methods, applied in the field of synthesis of PtCu nanocrystals, can solve the problems of new alloy crystal structure, low quality activity and high cost, and achieve the effects of novel crystal structure, excellent catalytic performance and high yield.

Inactive Publication Date: 2017-03-15
GUIZHOU UNIV
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a kind of synthetic method of the PtCu nanocrystal of sub-5 nanometer truncated octahedron, utilize a kind of synthetic method of the PtCu nanocrystal of sub-5 nanometer truncated octahedron to solve the traditional fuel cell generally adopt The most important is commercial carbon-supported platinum black, due to its high cost, low mass activity, low catalyst efficiency, and the problem that the crystal structure of this alloy is not new

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  • Synthesis method of sub-five nanometer truncated octahedron PtCu nanocrystal
  • Synthesis method of sub-five nanometer truncated octahedron PtCu nanocrystal
  • Synthesis method of sub-five nanometer truncated octahedron PtCu nanocrystal

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preparation example Construction

[0027] Such as Figure 1~4 Shown, a kind of synthetic method of the PtCu nanocrystal of sub-5 nanometer truncated octahedron comprises the steps:

[0028] In the first step, add PVP and NaI into the organic solvent DMF together, and stir at room temperature for 5-8 minutes;

[0029] The second step, adding 0.01 to 0.1 mol of metal platinum salt precursor solution and copper salt precursor solution to the mixed solution obtained in step (1), stirring at room temperature for 3 to 10 minutes;

[0030] The third step, adding hydroxylamine hydrochloride to the mixed solution obtained in step (2), stirring at room temperature for 1 to 10 minutes;

[0031] The fourth step is to transfer the mixed solution obtained in step (3) to an autoclave for a reaction time of 2 to 12 hours, and the temperature of the autoclave is controlled at 100 to 150°C;

[0032] The fifth step is cooling the product obtained in step (4), washing it, and centrifuging to obtain sub-5 nm truncated octahedral ...

Embodiment 1

[0038] A kind of synthetic method of the PtCu nano crystal of sub-5 nanometer truncated octahedron, comprises the steps:

[0039] (1) Add PVP and NaI to the organic solvent DMF together, stir at room temperature for 5-8 minutes, the mass ratio of PVP to NaI is 1:3; the amount of organic solvent DMF added needs to completely dissolve PVP and NaI;

[0040] (2) Add metal platinum salt and copper salt precursor solution to the mixed solution obtained in step (1), the amount of metal salt precursor is 0.01-0.1mol; stir at room temperature for 3-10 minutes, the platinum salt precursor and copper salt The molar ratio of the precursor is 1:1;

[0041] (3) Add hydroxylamine hydrochloride to the mixed solution obtained in step (2), stir at room temperature for 1 to 10 minutes, and the mass ratio of hydroxylamine hydrochloride to PVP is 3:1;

[0042] (4) Transfer the mixed solution obtained in step (3) to an autoclave for reaction for 8 hours, and control the temperature at 130°C;

[0...

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Abstract

The invention discloses a synthesis method of a sub-five nanometer truncated octahedron PtCu nanocrystal. The synthesis method comprises the steps of adding PVP and NaI into an organic solvent DMF, and performing stirring in a room temperature; adding a metal platinum salt precursor solution and a copper salt precursor solution into a mixed solution, and performing stirring in the room temperature, wherein the mole ratio of a metal platinum salt precursor to a copper salt precursor is (1:1)-(1:5); adding hydroxylamine chloride into the obtained mixed solution, and performing stirring in the room temperature, wherein the mass ratio of the hydroxylamine chloride to the PVP is (1:1)-(3:1); transferring the obtained mixed solution to a high-pressure reaction kettle for reaction for 2-12 hours, wherein the temperature is controlled to be 100-150 DEG C; and washing the obtained product after cooling, and performing centrifugal separation to obtain the sub-five nanometer truncated octahedron PtCu nanocrystal. The sub-five nanometer truncated octahedron PtCu nanoalloy has excellent catalytic performance on ethanol oxidation and oxygen reduction in an alkaline medium, and can substitute a current commercial carbon-supported platinum black catalyst.

Description

technical field [0001] The invention relates to a method for synthesizing PtCu nanocrystals with sub-5 nanometer truncated octahedrons, in particular to a method for synthesizing PtCu nanocrystals with sub-5 nanometers truncated octahedra and their application in fuel cells, belonging to the field of energy nanomaterials . Background technique [0002] Metal Pt and Cu have irreplaceable roles in alcohol oxidation, oxygen reduction, nitrogen fixation, biomass fuel and liquid fuel cell. The intrinsic link between structure and performance determines the importance of controlling the size and shape of metal nanocrystals. There is no case for the synthesis method and shape control technology of sub-5nm truncated octahedral PtCu nanocrystals synthesized in the liquid phase. Moreover, the addition of Cu to form an alloy can not only enhance the catalytic performance of the catalyst, but also greatly reduce the cost of the catalyst. Therefore, the controllable synthesis of sub-5...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92H01M8/00
CPCH01M4/8825H01M4/921H01M8/00Y02E60/50
Inventor 袁强刘太阳
Owner GUIZHOU UNIV
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