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Amorphous Pt nano-catalyst as well as preparation method and application thereof

A nano-catalyst and amorphous technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of harsh preparation methods of amorphous Pt, harsh experimental conditions, and high requirements for instruments, and achieve HER activity is high, stability is good, and the method is simple and easy to implement

Inactive Publication Date: 2020-03-27
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0003] However, the preparation method of amorphous Pt is relatively harsh. Traditionally, rapid solidification technology or near-rapid solidification technology is used to prepare amorphous materials. This type of method needs to first melt the metal or metal precursor material at high temperature and then rapidly cool it to make the metal atoms appear liquid. state, it is too late to arrange and present a chaotic state, forming an amorphous structure
This preparation method has high requirements on instruments and harsh experimental conditions.

Method used

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  • Amorphous Pt nano-catalyst as well as preparation method and application thereof
  • Amorphous Pt nano-catalyst as well as preparation method and application thereof
  • Amorphous Pt nano-catalyst as well as preparation method and application thereof

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preparation example Construction

[0029] As a preparation scheme of an amorphous Pt nanocatalyst, the steps are as follows:

[0030] (1) At room temperature, the H 2 PtCl 6 ·6H 2 O is dissolved in water, stirred magnetically, and prepared into a Pt precursor solution with a mass concentration of 1 to 5 wt %;

[0031] (2) Take 1-10ml of Pt precursor solution and dissolve it in 20-80ml of water, and dilute it into a light yellow transparent solution or sol of Pt;

[0032] (3) In the light yellow Pt transparent solution or sol in step (2), slowly drop the complexing agent (that is, containing Carbon organic matter, selected from pyrrole, polypyrrole, etc.), magnetically stirred to form a uniform mixed solution;

[0033] (4) Slowly react the mixed solution prepared in step (3) with magnetic stirring at 25-40° C. for 10-16 hours;

[0034] (5) The suspension obtained in step 4) was centrifuged several times, and then dried in a freeze dryer to obtain an amorphous Pt nanomaterial. The characteristics of the amo...

Embodiment 1

[0037]According to the above technical scheme and process flow of the present invention, first prepare the precursor solution of Pt, take 1g of chloroplatinic acid and dissolve it in 50 milliliters of water at room temperature, prepare a chloroplatinic acid aqueous solution with a mass concentration of 2wt%, magnetically stir evenly, and form yellow Clear solution. Then, 2ml of the Pt precursor solution was taken and dissolved in 30ml of water to be diluted into a light yellow transparent Pt precursor solution. Take 0.02ml of pyrrole (3.8 times the molar weight of the Pt ion precursor), slowly add it dropwise to the above-mentioned Pt transparent precursor solution under magnetic stirring, and continue magnetic stirring at room temperature (25°C) (rotating speed is 300 rpm / min), slowly reacted for 12 hours to form a sol suspension. The suspension is centrifuged and washed several times, and then dried in a freeze dryer to obtain a Pt nanomaterial with an amorphous structure;...

Embodiment 2

[0040] According to the process described in Example 1, take 0.02ml of pyrrole and slowly add it dropwise to the transparent Pt precursor solution, continue magnetic stirring (rotating at 200 rpm) at room temperature (25°C), and slowly react for 10 hours to form a sol Suspension liquid, other operating conditions are with embodiment 1, obtain the Pt nanometer material with amorphous structure, and phase appearance is the flake (as image 3 shown in B), and no crystallization streaks and crystallization grains were found (such as image 3 Middle and high resolution TEM picture E is shown).

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Abstract

The invention relates to an amorphous Pt nano-catalyst as well as a preparation method and application thereof. The preparation method of the amorphous Pt nano-catalyst comprises the following steps of adding a carbon-containing organic matter into a Pt ion precursor aqueous solution, and reacting at 25-40 DEG C for 10-16 hours to form an amorphous structure while Pt ions in a Pt ion precursor arereduced, therefore, obtaining the amorphous Pt nano-catalyst, wherein the carbon-containing organic matter is selected from at least one of pyrrole and polypyrrole.

Description

technical field [0001] The invention relates to an amorphous Pt nano-catalyst and its preparation method and application, belonging to the technical field of inorganic nano-materials. Background technique [0002] The noble metal Pt exhibits superior catalytic activity in reactions such as electrolysis of water for hydrogen production (HER) and fuel cell electrode catalysis. However, its high price and limited reserves make it difficult to popularize and apply it. How to effectively use Pt catalysts and give full play to its catalytic activity The activity advantage is particularly important. Amorphous Pt is a metastable structure material. The lattice presents the characteristics of short-range order and long-range disorder. ), a substance that still retains its morphology and composition. Amorphous Pt materials are characterized by the presence of many coordinatively highly unsaturated atoms on their surface with a high density of surface active centers; in particular, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J35/00B01J35/02B01J37/16C25B1/04C25B11/06
CPCB01J23/42B01J37/16C25B1/04C25B11/081B01J35/393B01J35/50B01J35/33B01J35/23B01J35/40Y02E60/36
Inventor 崔香枝施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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