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CuZn double-monatomic electrochemical catalysis CO2 reduction material and preparation method thereof

An electrochemical and atomic technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to solve problems such as inability to obtain catalytic performance

Active Publication Date: 2020-10-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the best of the existing methods is to improve the catalytic activity independently based on a single electron atom, but this type of method still cannot obtain better catalytic performance. Therefore, it is necessary to explore a better electrochemical catalytic CO 2 There is an urgent need to restore raw materials

Method used

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  • CuZn double-monatomic electrochemical catalysis CO2 reduction material and preparation method thereof
  • CuZn double-monatomic electrochemical catalysis CO2 reduction material and preparation method thereof
  • CuZn double-monatomic electrochemical catalysis CO2 reduction material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take 5g melamine, 5g glutamic acid, 0.5gCuCl 2 , 0.5gZnCl 2 Add it into 10 g of deionized water, stir evenly with a magnetic force, and dry the solution in an oven at 150°C. The dried powder product was placed in a tube furnace for calcination, and the temperature was raised to 800° C. at a rate of 5° C. / min under an inert gas atmosphere, and kept for 3 hours. After the heat preservation is over, it is also naturally cooled down to room temperature under an inert gas atmosphere to obtain CuZn SAs electrochemically catalyzed CO 2 Reduction of raw materials.

[0046] The micro-morphological characteristics of CuZn SAs electrocatalyst materials were studied by transmission electron microscopy and spherical aberration electron microscopy. figure 1 (a) is the transmission electron microscope image of CuZn SAs, composed of figure 1 (a) Two-dimensional carbon nanosheets with smooth and flat surfaces can be observed. figure 1 (b) is the spherical aberration electron micros...

Embodiment 2

[0050] Embodiment 2: the impact of metal salt dosage ratio on catalyst catalytic performance

[0051] Referring to Example 1, the CuCl 2 , ZnCl 2 The mass ratio is replaced by 1:2 (0.5gCuCl 2 , 1gZnCl 2 ) and 2:1 (1gCuCl 2 , 0.5gZnCl 2 ), other conditions remain unchanged, Cu 1 Zn 2 SAs, Cu 2 Zn 1 SAs electrochemically catalyze CO 2 Reduction of raw materials.

[0052] Test Cu according to the method in embodiment 1 1 Zn 2 SAs, Cu 2 Zn 1 SAs electrochemically catalyze CO 2 Electrochemical carbon dioxide reduction performance of reducing materials.

[0053] Cu was calculated using the relevant formula 1 Zn 2 SAs, Cu 2 Zn 1 The faradaic efficiency (FE) of SAs catalytic materials at different overpotentials is as follows: Figure 4 shown. Figure 4 (a) is Cu 1 Zn 2 SAs electrochemically catalyze CO 2 Faradaic efficiency plot of the products of reduced materials. Cu 1 Zn 2 SAs electrochemically catalyze CO 2 Products of reduced materials include...

Embodiment 3

[0054] Embodiment 3: the influence of metal salt concentration on catalyst catalytic performance

[0055] Referring to Example 1, the mass of each metal salt was replaced by 0.25g and 1g respectively, and other conditions were unchanged, and CuZn-0.25SAs and CuZn-1 SAs electrochemically catalyzed CO 2 Reduction of raw materials.

[0056] Test CuZn-0.25SAs and CuZn-1 SAs electrochemically catalyzed CO according to the method in Example 1 2 Electrochemical carbon dioxide reduction performance of reducing materials.

[0057] The faradaic efficiency values ​​(FE) of CuZn-0.25SAs and CuZn-1 SAs catalytic materials at different overpotentials were calculated by using relevant formulas as follows: Figure 5 shown. Figure 5 (a) CuZn-0.25SAs electrochemically catalyzes CO 2 Faradaic efficiency plot of the products of reduced materials. CuZn-0.25SAs electrochemically catalyzes CO 2 Products of reduced materials include hydrogen, carbon monoxide, ethanol. And, compared with the C...

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Abstract

The invention discloses a CuZn double-monatomic electrochemical catalysis CO2 reduction material and a preparation method thereof, and belongs to the field of composite material preparation. The electrochemical catalysis CO2 reduction material is composed of a reaction active matter and a carrier, CuZn double-monatoms are used as the reaction active matter, and nitrogen-doped carbon nanosheets areused as the carrier; the metals Cu and Zn exist in the form of single atoms and have the maximum atom utilization efficiency, so that the electrocatalytic material has relatively excellent catalyticactivity and selectivity, and the Faraday efficiency of a product ethanol is close to 50% within a relatively wide voltage test range (-0.8 to -1.3 V vs.RHE).

Description

technical field [0001] The invention relates to a CuZn double single-atom electrochemical catalysis CO 2 The reduction material and its preparation method technology belong to the technical field of composite material preparation. Background technique [0002] The shortage of fossil fuels and environmental pollution are major problems facing society today. carbon dioxide (CO 2 ) is the most widely distributed and abundant "carbon" resource on the earth, and CO 2 Converted into high value-added hydrocarbons and alcohols, not only can reduce CO 2 direct emissions, and realize a real carbon cycle, helping to solve the global energy shortage problem. Electrochemically convert CO 2 The reaction conditions for conversion to hydrocarbons are mild, the operation is simple, and it has very good research and application prospects. [0003] CO 2 Electrochemical reduction reaction (CO 2 RR) is a complex multi-step and multi-electron reaction process that occurs at the three-phas...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B3/04C25B11/06
CPCB01J27/24B01J35/33
Inventor 孙舒慧朱罕杜明亮李会林张颂歌
Owner JIANGNAN UNIV
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