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Applications of ultrathin palladium sheets in promotion of carbon dioxide electroreduction

A carbon dioxide, ultra-thin technology, used in metal/metal oxide/metal hydroxide catalysts, electrodes, electrolysis processes, etc., can solve limited problems, achieve simple operation, reduce initial potential, and reduce overpotential effects.

Active Publication Date: 2019-11-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies on palladium-catalyzed carbon monoxide production are currently limited.

Method used

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  • Applications of ultrathin palladium sheets in promotion of carbon dioxide electroreduction
  • Applications of ultrathin palladium sheets in promotion of carbon dioxide electroreduction
  • Applications of ultrathin palladium sheets in promotion of carbon dioxide electroreduction

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1. Palladium acetylacetonate, polyvinylpyrrolidone, sodium bromide, N,N-dimethylformamide and water were mixed, refined for 10 hours, and the obtained homogeneous solution was transferred to a glass container. Introduce carbon monoxide to an atmospheric pressure, heat at 100 degrees Celsius, and cool to room temperature. The ethanol-acetone mixed solution was centrifuged to obtain palladium sheets (S.Tang, M.Chen, N.Zheng, Small 2014, 10, 3139-3144) with a side length of 5.1 nm, as follows:

[0026] (1) Mix 10 mg of palladium acetylacetonate, 32 mg of polyvinylpyrrolidone, 30.6 mg of sodium bromide with 2 mL of N,N-dimethylformamide and 4 mL of water, let stand for 10 hours, and transfer the resulting homogeneous solution to a glass container. Introduce carbon monoxide to atmospheric pressure, heat at 100°C for 1 hour, then cool to room temperature.

[0027] (2) Add 2 mL of acetone to the obtained product, and centrifuge at 10000 rpm for 10 minutes. The solid ...

Embodiment 2

[0030]Example 2. Palladium acetylacetonate, citric acid, hexadecylmethyltrimethylammonium bromide, polyvinylpyrrolidone, and N,N-dimethylformamide were mixed and allowed to stand for 1 hour. The resulting homogeneous solution was transferred to a flask, added tungsten hexacarbonyl, and reacted under an argon atmosphere. React at 80 degrees Celsius for half an hour. After cooling to room temperature, centrifuge to obtain palladium sheets with a side length of 9.6 nanometers (Y.Li, W.Wang, K.Xia, W.Zhang, Y.Jiang, Y.Zeng, H.Zhang, C.Jin, Z.Zhang , D.Yang, Small2015,11,4745-4752)—Adopt the method of Example 1 to react, the difference is only that the reaction reagent of step (1) is replaced by: 16mg palladium acetylacetonate, 140mg citric acid, 60mg hexadecyl Trimethylammonium bromide, 30mg polyvinylpyrrolidone, 100mg tungsten hexacarbonyl, 10mL N,N-dimethylformamide.

Embodiment 3

[0031] Example 3. Palladium acetylacetonate, citric acid, hexadecylmethyltrimethylammonium bromide, polyvinylpyrrolidone, and N,N-dimethylformamide were mixed and allowed to stand for 1 hour. The resulting homogeneous solution was transferred to a flask, added tungsten hexacarbonyl, and reacted under an argon atmosphere. React for one hour at 80°C. After cooling to room temperature, centrifuge to obtain palladium flakes with a side length of 15.9 nanometers (Y.Li, W.Wang, K.Xia, W.Zhang, Y.Jiang, Y.Zeng, H.Zhang, C.Jin, Z.Zhang , D.Yang, Small 2015,11,4745-4752)—Adopt the method of Example 1 to react, the difference is only that the reaction reagent of step (1) is replaced by: 16mg palladium acetylacetonate, 90mg citric acid, 60mg hexadecane Trimethylammonium bromide, 30mg polyvinylpyrrolidone, 100mg tungsten hexacarbonyl, 10mL N,N-dimethylformamide.

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Abstract

The invention discloses applications of ultrathin palladium sheets in promotion of carbon dioxide electroreduction. According to the invention, solution thermal method is adopted, reducing agent and surfactant kind, using amount, and reaction time are regulated, so that synthesis of regular hexagonal palladium sheets is realized, the ratio of different sites is calculated, experiment and density functional theory calculation are combined, and study on activity increasing site sources is carried out. The growth method of the hexagonal ultrathin palladium sheets is simple in operation; reactionconditions are mild; the preparation process is controllable; the repeatability is high; no large equipment is needed; economical benefit is excellent; the prepared material is excellent in carbon dioxide reduction performance; and certain industrial value is achieved.

Description

technical field [0001] The invention relates to the field of carbon dioxide electroreduction cathodes, more specifically, the application and mechanism exploration of highly efficient catalytic carbon dioxide to carbon monoxide by using the edge sites of ultra-thin palladium sheets. Background technique [0002] Carbon dioxide, the main gas that produces the greenhouse effect, has caused serious climate and energy problems. Carbon dioxide electroreduction is an effective method to effectively suppress carbon dioxide emissions and produce high value-added products (C.Costentin, M.Robert, J.M.Saveant, Chem.Soc.Rev.2013,42,2423-2436). However, due to the slow kinetic rate of carbon dioxide reduction and intense competition from the hydrogen evolution reaction, carbon dioxide conversion has been plagued by high onset potential and low product selectivity (J. Qiao, Y. Liu, F. Hong, J. Zhang, Chem. Soc. Rev. 2014, 43, 631-675). Metal catalysts have received extensive attention a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/02C25B3/04C25B11/08C25B3/25
CPCB01J23/44C25B11/04C25B3/25B01J35/50B01J35/33
Inventor 巩金龙朱文锦张雷杨漂萍赵志坚
Owner TIANJIN UNIV
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