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Electrode for electrochemical reduction of CO2 and preparation of formic acid and preparation method and application thereof

A CO2, electrochemical technology, applied in the field of electrochemistry, can solve the problem of less catalytic active points on the surface of the metal sheet electrode, and achieve the effects of increased current density, stable structure, and high specific surface area.

Active Publication Date: 2015-08-19
日照新睿招商发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem of few catalytic active points on the surface of the metal sheet electrode used in the existing research, and provides a copper foam with a high specific surface as the substrate, and then electroplates a layer of low-melting-point metal catalyst on its surface. thereby electrochemically reducing CO 2 In the process of formic acid production, high Faraday efficiency can be obtained while the reaction rate can be increased

Method used

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  • Electrode for electrochemical reduction of CO2 and preparation of formic acid and preparation method and application thereof
  • Electrode for electrochemical reduction of CO2 and preparation of formic acid and preparation method and application thereof
  • Electrode for electrochemical reduction of CO2 and preparation of formic acid and preparation method and application thereof

Examples

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Embodiment 1

[0031] Example 1: The electroplating solution is an aqueous electroplating solution, sodium citrate is added to deionized water to make 0.009 mol L -1 aqueous solution, and stirred at room temperature to dissolve it, and then added 0.003 mol L -1 of stannous chloride, stirred for 10 h. The copper foam was then placed in this electroplating solution at 1 mA cm -2 After constant current electroplating under high temperature for 15 min, it was ultrasonically rinsed with ethanol and deionized water, and dried to obtain a Sn / Cu electrode. figure 1 , 2 and image 3 , 4 SEM images of copper foam and Sn / Cu electrodes, respectively, can confirm that tin particles have been successfully loaded on the surface of copper foam (see image 3 , 4 ). At the same time by Figure 5 It can be seen from the linear voltammogram shown that the reduction current density of the Sn / Cu electrode is significantly higher than that of the Sn sheet electrode, which indicates that the Sn / Cu electrode...

Embodiment 2

[0032] Embodiment 2: The electroplating solution is an aqueous electroplating solution, and sodium citrate is added into deionized water to make 0.02 mol L -1 Aqueous solution, and stirred at room temperature to dissolve, then add 0.005 mol L -1 indium sulfate, stirred for 12 h. The copper foam was then placed in the electroplating solution at 3 mA cm -2 After constant current electroplating under high temperature for 30 min, it was ultrasonically rinsed with ethanol and deionized water, and dried to obtain an In / Cu electrode. With the In / Cu electrode as the working electrode (cathode), the graphite electrode as the auxiliary electrode (anode), and the silver-silver chloride electrode as the reference electrode, the electrolyte solution is filled into the electrolytic cell, and CO 2 to saturation, and then continue to feed CO 2 Electrolytic reduction is carried out to produce formic acid under optimal conditions, and a high Faradaic efficiency of more than 85% can be obtain...

Embodiment 3

[0033] Example 3: The electroplating solution is an aqueous electroplating solution, and sodium citrate is added to deionized water to make 0.06 mol L -1 Aqueous solution, and stirred at room temperature to dissolve, then add 0.015 mol L -1 bismuth nitrate, stirred for 16 h. Then place copper foam in this electroplating solution at 5 mA·cm -2 After constant current electroplating under high temperature for 60 min, it was ultrasonically rinsed with ethanol and deionized water, and dried to prepare a Bi / Cu electrode. With Bi / Cu electrode as working electrode (cathode), IrO 2 ·RuO 2 The coated titanium electrode is the auxiliary electrode (anode), the silver silver chloride electrode is the reference electrode, the electrolyte solution is filled into the electrolytic cell, and CO 2 to saturation, and then continue to feed CO 2 Electrolytic reduction is carried out to produce formic acid under optimal conditions, and a high Faradaic efficiency of more than 85% can be obtained...

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Abstract

The invention relates to an electrode for electrochemical reduction of CO2 and preparation of formic acid and a preparation method and an application thereof, and belongs to the field of a carbon dioxide resource technology. A traditional metal electrode has smooth surface and few catalytic active sites, which are not beneficial to rapid reaction. According to the invention, foamy copper with high specific surface is used as a substrate, and a layer of a low-melting-point metal catalyst is electroplated on the surface of the foamy copper so as to effectively raise reaction rate. The foamy copper can undergo surface electroplating in different formulations of electroplate liquids. The electroplated electrode still maintains a porous structure of foamy copper. The low-melting-point metal coating on the surface can efficiently electro-catalyze carbon dioxide to prepare formic acid. By the method, insufficiency of low surface catalytic active point of a traditional metal electrode can be improved. High Faradic efficiency of electrochemical reduction of CO2 and preparation of formic acid is guaranteed, and generation speed of formic acid also can be accelerated. The method is expected to be applied in the industrial process.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to an electrode for producing formic acid by electrochemically reducing carbon dioxide with high efficiency, a preparation method and application thereof. Background technique [0002] The rapid development of modern industry has brought human beings' thirst for energy substances. Currently widely used energy substances are fossil energy, which produce a large amount of CO when they are burned 2 , CO 2 Emissions are faster than green plants absorb CO through photosynthesis 2 rate, resulting in CO 2 enrichment in the atmosphere. To reduce CO 2 The future power supply will gradually reduce its dependence on fossil energy, and more use of renewable energy such as solar energy, wind energy, and tidal energy. Most renewable energy sources are intermittent, and this discontinuous power generation poses a challenge to maintaining the balance of the grid. Therefore, it is ...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/06C25D7/04C25B3/04C25B3/25
Inventor 吕伟欣周静王伟闫格胥莹莹
Owner 日照新睿招商发展有限公司
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