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Monoatomic/diatomic catalyst as well as controllable synthesis method and application thereof

A catalyst and two-atom technology, applied in the field of single/dual-atom catalysts and their controllable synthesis, can solve problems such as the exploration of the universality of limiting elements, high overpotential, selective decay, etc., and achieve low preparation cost and catalytic stability The effect of good performance and good application prospect

Active Publication Date: 2021-10-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the faradaic efficiency of the catalyst synthesized using this strategy drops sharply at high voltage, indicating that the selectivity to CO has been significantly attenuated.
At the same time, only heterogeneous DACs can be synthesized using this strategy, but DACs of the same metal cannot be synthesized, which also limits its wide application and the exploration of the universality of elements. At the same time, the catalyst synthesized using this synthesis strategy has a high Overpotential, not conducive to practical industrial applications

Method used

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  • Monoatomic/diatomic catalyst as well as controllable synthesis method and application thereof
  • Monoatomic/diatomic catalyst as well as controllable synthesis method and application thereof
  • Monoatomic/diatomic catalyst as well as controllable synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Dry a certain amount of sodium citrate tetrahydrate in an oven at 150 degrees Celsius for 48 hours;

[0046] The dried sodium citrate is transferred to a tube furnace at 800 degrees centigrade and calcined under an argon atmosphere for 1 hour to obtain a black product; then the obtained black product is ground into a black powder with a mortar;

[0047] Add the black powder to a sulfuric acid solution with a concentration of 3mol / L, and heat at 80°C for 12 hours;

[0048] The sulfuric acid solution dispersed with black powder is suction filtered, then washed to neutrality with ultrapure water and ethanol to obtain the black powder after suction filtration;

[0049] The black powder after suction filtration was placed in an oven at 75 degrees Celsius and dried for 12 hours to obtain porous carbon nanosheets.

[0050] Such as figure 2 , image 3 Shown, are respectively the spherical aberration correction annular dark field phase scanning transmission electron microscope...

Embodiment 2

[0052] Measure 2 ml of absolute ethanol into a 10 ml glass bottle, and stir magnetically; add 12.8 mg of nickel acetate tetrahydrate into the above glass bottle, and continue stirring until completely dissolved; add 50 microliters of ammonia water into the glass bottle; Then weigh 30 mg of citric acid and add it to the above-mentioned glass bottle, and continue to stir for one hour; after the stirring is completed, take 100 mg of the porous carbon nanosheets prepared in Example 1 and add it to the above-mentioned glass bottle, and continue to stir for 12 hours; The homogeneous slurry obtained after stirring was placed in an oven at 75 degrees Celsius and dried for 12 hours to obtain a black solid; weighed 1 gram of dicyandiamide and the black solid for grinding, and after grinding evenly, placed it in a tube furnace at 800 degrees Celsius for calcination under an argon atmosphere The sample was obtained in 2 hours; the calcined sample was washed several times with a hydrochlori...

Embodiment 3

[0054] Measure 2 ml of absolute ethanol and add it to a 10 ml glass bottle, and stir it magnetically; add 12.8 mg of nickel acetate tetrahydrate into the above glass bottle, and continue stirring until it is completely dissolved; then weigh 30 mg of citric acid and add it to the above In the glass bottle, continue to stir for one hour; after the stirring is completed, take 100 mg of the porous carbon nanosheets prepared in Example 1 and add it to the above glass bottle, and continue to stir for 12 hours; place the homogeneous slurry obtained after stirring in a 75 Dry in an oven for 12 hours at Celsius to obtain a black solid; weigh 1 gram of dicyandiamide and grind the black solid, grind evenly and place it in an 800-degree Celsius tube furnace for calcination for 2 hours under an argon atmosphere to obtain a sample; the calcined sample is used The hydrochloric acid solution with a concentration of 3 mol / L was washed several times, followed by ultrapure water and absolute etha...

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Abstract

The invention discloses a monoatomic / diatomic catalyst and a controllable synthesis method and application thereof. According to the method, firstly, a porous carbon nanosheet is prepared, precise regulation and control of an atomic-scale structure are achieved through simple synthesis conditions, and a catalytic mechanism can be deeply understood through clearer active centers and active sites; and the monoatomic / diatomic catalyst is applied to electrocatalytic reduction of carbon dioxide and shows excellent catalytic activity, and meanwhile, the monoatomic / diatomic catalyst is good in catalytic stability and low in preparation cost, has very good practical applicability, and has excellent application prospects in the field of electrocatalytic reduction of carbon dioxide.

Description

technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to a single / dual atom catalyst and its controllable synthesis method and application. Background technique [0002] Excessive carbon dioxide emissions from the continued consumption of fossil fuels have raised serious environmental concerns. Electrocatalytic CO2 reduction has attracted extensive attention due to its ability to convert CO2 into high-value-added chemicals and fuels while closing the carbon cycle and ultimately addressing environmental and energy crises driven by renewable energy. In order to achieve high CO2 conversion efficiency in practical applications, powerful and highly active catalysts are essential. In recent years, single-atom catalysts (SACs) have attracted much attention in the field of catalysis due to their 100% atom utilization and outstanding catalytic performance in heterogeneous catalytic reactions such as water oxidation, oxygen reduction, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/031C25B11/061C25B11/075C25B1/23C01B32/15
CPCC25B11/031C25B11/061C25B11/075C25B1/23C01B32/15Y02P20/133
Inventor 鄢俊敏郝琦钟海霞刘开华刘冬雪
Owner JILIN UNIV
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