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A kind of single/dual atom catalyst and its controllable synthesis method and application

A catalyst and diatomic technology, applied in the field of single/dualatom catalysts and their controllable synthesis, can solve problems such as the exploration of the universality of limiting elements, high overpotential, selective attenuation, etc., and achieve low preparation cost and stable catalytic performance. The effect of good performance and good application prospects

Active Publication Date: 2022-07-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of single/dual atom catalyst and its controllable synthesis method and application
  • A kind of single/dual atom catalyst and its controllable synthesis method and application
  • A kind of single/dual atom catalyst and its controllable synthesis method and application

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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 was transferred to a tube furnace at 800 degrees Celsius and calcined under an argon atmosphere for 1 hour to obtain a black product; then the obtained black product was ground into black powder with a mortar;

[0047] The black powder was added to a sulfuric acid solution with a concentration of 3 mol / L, and heated at 80 degrees Celsius for 12 hours;

[0048] The sulfuric acid solution dispersed with the black powder is subjected to suction filtration, and 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 dried in an oven at 75 degrees Celsius for 12 hours to obtain porous carbon nanosheets.

[0050] like figure 2 , image 3 shown, respectively, the spherical aberration corrected annular dark field phase scanning transmi...

Embodiment 2

[0052] Measure 2 ml of absolute ethanol and add it to a 10ml glass bottle, and perform magnetic stirring; take 12.8 mg of nickel acetate tetrahydrate and add it to the above glass bottle, continue stirring until it is completely dissolved; add 50 microliters of ammonia water to the glass bottle; Subsequently, 30 mg of citric acid was weighed and added to the above-mentioned glass bottle, and the stirring was continued for one hour; after the stirring was completed, 100 mg of the porous carbon nanosheets obtained in Example 1 were weighed and added to the above-mentioned glass bottle, and the stirring was continued for 12 hours; The uniform slurry obtained after stirring was placed in an oven at 75 degrees Celsius to dry for 12 hours to obtain a black solid; 1 gram of dicyandiamide was weighed and the black solid was ground, and then placed in a tube furnace at 800 degrees Celsius for calcination under an argon atmosphere. The sample was obtained in 2 hours; the calcined sample ...

Embodiment 3

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

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Abstract

The invention discloses a single / dual-atom catalyst and a controllable synthesis method and application thereof. Firstly, porous carbon nanosheets are prepared. Through simple synthesis conditions, precise control of atomic-level structure is realized, and active centers and active sites are more clearly defined. It is conducive to a deeper understanding of the catalytic mechanism, and at the same time, it is applied to electrocatalytic carbon dioxide reduction, showing excellent catalytic activity, good catalytic stability, low preparation cost, and strong practical applicability, which can be used in The field of electrocatalytic carbon dioxide reduction has excellent application prospects.

Description

technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to a single / dual-atom catalyst and a controllable synthesis method and application thereof. Background technique [0002] Excessive carbon dioxide emissions from the continuous consumption of fossil fuels have caused serious environmental problems. Electrocatalytic CO2 reduction has received extensive attention because it is powered by renewable energy, converts CO2 into high value-added chemicals and fuels while closing the carbon cycle and ultimately solving the environmental and energy crises. In order to achieve high carbon dioxide 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% atomic utilization and their outstanding catalytic performance in heterogeneous catalytic reactions such as water oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(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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