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Oxygen-containing silicon nanosheet supported noble metal catalyst as well as preparation method and application thereof

A technology of noble metal catalysts and silicon nanosheets, which is applied in the direction of electrochemical generators, fuel cells, electrical components, etc., can solve the problems of noble metal active site masking and difficulty in accurately controlling the content, so as to improve the utilization rate and electrocatalytic efficiency, The preparation process is simple and the effect of simplifying the preparation reaction conditions

Inactive Publication Date: 2021-08-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the doping types of N heteroatoms have different effects on the electrocatalytic performance of supported noble metal catalysts, and it is difficult to precisely control the content of different doping types of N.
In addition, in the traditional liquid-phase synthesis of noble metal catalysts, reducing agents or surfactants are often added, which can easily cause the problem of noble metal active sites being masked.

Method used

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  • Oxygen-containing silicon nanosheet supported noble metal catalyst as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0032] A preparation method of oxygen-containing silicon nanosheet supported noble metal platinum catalyst, comprising the following steps:

[0033] (1) Preparation of oxygen-containing silicon nanosheets: under vigorous stirring and a constant temperature of 25°C, 2g of calcium silicide powder was added to 200mL of concentrated hydrochloric acid for etching reaction, and then the resulting precipitate was washed and purified with acetone and ultrapure water , then centrifuged, freeze-dried, and collected to obtain oxygen-containing silicon nanosheet powder.

[0034] (2) Dissolve chloroplatinic acid in 30 mL of ultrapure water to form a chloroplatinic acid solution with a concentration of 2.0 mmol / L. Subsequently, the solid product oxygen-containing silicon nanosheets prepared in step (1) was added to the solution, and a uniform dispersion (3.0 mg / mL) was formed by ultrasonic treatment. Then, the mixed solution was transferred to an autoclave, and reacted for 12 hours at a te...

Embodiment 2

[0036] A preparation method of oxygen-containing silicon nanosheet supported noble metal palladium catalyst, comprising the following steps:

[0037](1) Preparation of oxygen-containing silicon nanosheets: under vigorous stirring and ice bath conditions, 2 g of calcium silicide powder was added to 200 mL of concentrated hydrochloric acid for etching reaction, and then the obtained precipitate was washed and purified with acetone and ultrapure water, Further, centrifugal separation and freeze-drying are carried out to obtain oxygen-containing silicon nanosheet powder.

[0038] (2) Potassium chloropalladate was dissolved in 30 mL of ultrapure water to form a potassium chloropalladate solution with a concentration of 1.5 mmol / L. Subsequently, the solid product oxygen-containing silicon nanosheets prepared in step (1) was added to the solution, and a uniform dispersion (2.0 mg / mL) was formed by ultrasonic treatment. Then, the mixed solution was transferred to an autoclave, and re...

Embodiment 3

[0040] A preparation method of oxygen-containing silicon nanosheet supported noble metal iridium catalyst, comprising the following steps:

[0041] (1) Preparation of oxygen-containing silicon nanosheets: under vigorous stirring and ice bath conditions, 2 g of calcium silicide powder was added to 200 mL of concentrated hydrochloric acid for etching reaction, and then the obtained precipitate was washed and purified with acetone and ultrapure water, Further, centrifugal separation and freeze-drying are carried out to obtain oxygen-containing silicon nanosheet powder.

[0042] (2) Dissolve chloroiridic acid in 30 mL of ultrapure water to form a chloroiridic acid solution with a concentration of 1.2 mmol / L. Subsequently, the solid product oxygen-containing silicon nanosheets prepared in step (1) was added to the solution, and a uniform dispersion (2.0 mg / mL) was formed by ultrasonic treatment. Then, the mixed solution was transferred to an autoclave, and reacted for 12 hours at ...

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Abstract

The invention discloses an oxygen-containing silicon nanosheet (SiOx NSs) supported noble metal catalyst as well as a preparation method and application thereof. The unique group of SiOx NSs is utilized to realize high-dispersion loading of noble metal on the surface of SiOx NSs, and the problem that active sites are masked due to the use of a reducing agent or a surfactant in a traditional liquid-phase synthesis method is avoided. The preparation method comprises the following steps of firstly, adding calcium silicide into concentrated hydrochloric acid for etching, so that calcium ions are deintercalated to form oxygen-containing silicon nanosheets with Si-H and Si-OH groups and a layered structure, and uniformly dispersing SiOx NSs in a noble metal inorganic compound aqueous solution, and carrying out a hydrothermal reaction to obtain the noble metal / oxygen-containing silicon nanosheet composite material. The SiOx NSs supported noble metal catalyst prepared by the invention has excellent electrocatalytic activity and stability on methanol oxidation reaction and hydrogen evolution reaction, and has a good application prospect in the technical field of sustainable energy conversion. The invention provides a universal preparation strategy of a novel noble metal catalyst, the synthesis process is simple, and the utilization rate of noble metal is improved.

Description

technical field [0001] The invention belongs to the technical field of material science and electrochemical energy conversion, and specifically relates to an oxygen-containing silicon nanosheet-supported noble metal catalyst, a preparation method thereof, and an application in electrocatalytic methanol oxidation reaction and hydrogen evolution reaction. Background technique [0002] With the increasing energy crisis and environmental pollution caused by the current use of fossil energy, the development of sustainable energy conversion technology is imminent for human survival and social development. Methanol and other alcohol small molecule liquid fuels have become an ideal fuel for fuel cells due to their wide range of sources, high theoretical energy density, and easy storage and transportation. At the same time, hydrogen stands out among many new energy sources due to its abundant sources, high combustion calorific value, and no pollution, and is an ideal energy carrier. ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88H01M4/92H01M8/1011
CPCH01M4/9075H01M4/9041H01M4/925H01M4/8825H01M8/1011Y02E60/50
Inventor 杜翠翠陈金华张小华戴琪
Owner HUNAN UNIV
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