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A gas diffusion electrode for electrochemical reduction of carbon dioxide and its preparation and application

A gas diffusion electrode and carbon dioxide technology, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of being easily decomposed and poisoned, the electrode manufacturing process is cumbersome, and the preparation method is complicated, so as to shorten the gas diffusion path and improve the effective Active area, the effect of simplifying the preparation process

Active Publication Date: 2019-07-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method is more complicated, and the performance of the electrode is lower (Faraday efficiency is less than 60%)
In addition, the above-mentioned electrodes mainly prepare Sn catalysts on tin foil and glassy carbon electrodes by various methods. In the actual application process, the prepared catalysts need to be scraped off the electrodes, and then coated on the surface of the carbon substrate with a binder. , resulting in a cumbersome electrode fabrication process, and the preparation of the catalyst due to the coating of the binder, the activity specific surface area decreases, resulting in a decrease in activity
In addition, the Sn-based catalyst is easily decomposed and poisoned during the long-term electrolysis process, which reduces the performance of the electrode.

Method used

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  • A gas diffusion electrode for electrochemical reduction of carbon dioxide and its preparation and application
  • A gas diffusion electrode for electrochemical reduction of carbon dioxide and its preparation and application

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Effect test

Embodiment 1

[0039] Treat with carbon paper in the air at 550°C, then degrease and clean in acetone;

[0040] Obtained by electrochemical tin plating on the surface of the above-mentioned substrate by a constant current method; in the process of electrochemical tin plating, the plating solution has a concentration of 30g / L sodium stannate Na 2 SnO 3 ·3H 2 O solution, 15g / LNaOH solution and 5g / L buffer solution mixture; the constant current is -60mA / cm 2 , the tinning time is 10000s; dissolve phenol in the mixed solvent of DMF and THF, and stir at a temperature of 25-50 degrees Celsius until the organic additives are completely dissolved to form a solution with a mass concentration of 10%; the mass content of THF in the mixed solvent 20%; by spraying, the above-mentioned organic additive solution is sprayed onto the surface of the obtained Sn catalyst; the electrode prepared in the above step 4) is taken out and dried at room temperature, and then dried in a vacuum oven at 80 degrees Cels...

Embodiment 2

[0042] Treat with carbon paper in the air at 550°C, then degrease and clean in acetone;

[0043] Obtained by electrochemical tin plating on the surface of the above-mentioned substrate by a constant current method; in the process of electrochemical tin plating, the plating solution has a concentration of 30g / L sodium stannate Na 2 SnO 3 ·3H 2 O solution, 15g / L KOH solution and 5g / L buffer solution mixture; the constant current is -40mA / cm 2 , the tinning time is 10000s; dissolve phenol in the mixed solvent of DMF and THF, and stir at a temperature of 25-50 degrees Celsius until the organic additives are completely dissolved to form a solution with a mass concentration of 20%; the mass content of THF in the mixed solvent 30%; Utilize the mode of spraying, the above-mentioned organic auxiliary agent solution is sprayed on the Sn catalyst surface that obtains; The electrode that above-mentioned step 4) is prepared is taken out and dried in room temperature, after drying in vacu...

Embodiment 3

[0045] Treat with carbon paper in air at 450°C, then degrease and clean in acetone;

[0046] Obtained by electrochemical tin plating on the surface of the above substrate by a constant voltage method; in the process of electrochemical tin plating, the plating solution has a concentration of 30g / L sodium stannate Na 2 SnO 3 ·3H 2 O solution, 15g / L NaOH solution and 5g / L buffer solution mixture; the constant voltage is -1.2V, and the tin plating time is 10000s; polyacrylonitrile is dissolved in DMF and THF mixed solvent, and the temperature is 25-50 Stir until the organic auxiliary agent is completely dissolved in Celsius to form a solution with a mass concentration of 10%; the mass content of THF in the mixed solvent is 20%; the above-mentioned organic auxiliary agent solution is sprayed onto the surface of the obtained Sn catalyst by spraying; The electrode prepared in the above step 4) was taken out and dried at room temperature, and then dried in a vacuum oven at 80 degree...

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Abstract

The invention relates to a gas diffusion electrode for electrochemical reduction of carbon dioxide and its preparation and application. The electrode includes a base layer, a mixed layer of Sn catalyst and organic auxiliary agent attached to the base layer, and the molar ratio of the Sn catalyst and the organic auxiliary agent. 100:1‑30:1, the loading amount of Sn catalyst in the electrode is 0.1mg / cm ‑2 -5 mg / cm ‑2 . During the electrochemical reduction of carbon dioxide, the substrate layer plays the role of support, conducts electricity, and forms liquid and gas transport channels, the Sn catalyst catalyzes the reduction of carbon dioxide, and the organic additive can stabilize the intermediate reactant CO 2 · ‑ , improve CO 2 concentration, thereby reducing the overpotential of the electrochemical reaction of carbon dioxide and increasing its current density and efficiency. In addition, the additives in the electrode also anchor the Sn catalyst on the surface of the carbon substrate, and the electrode has high stability.

Description

technical field [0001] The invention relates to an electrode for electrochemical reduction of carbon dioxide and its application, and belongs to the technical field of carbon dioxide resource utilization and energy storage. Background technique [0002] In recent years, with the rapid development of the economy, environmental problems and energy shortages have become increasingly serious. Among them, global warming has also become an urgent problem to be solved by countries all over the world, and CO 2 The large amount of emissions is one of the main causes of global warming. Therefore, how to effectively use CO 2 and reduce CO 2 emissions have aroused widespread concern. [0003] In terms of energy consumption and cost, the electrochemical reduction method has the advantages of being able to react at room temperature and pressure, low energy consumption, and high conversion efficiency. 2 One of the more feasible ways in transformation technology. ERC technology is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/62
CPCH01M4/62H01M4/8605H01M4/8657H01M4/88Y02E60/10Y02E60/50
Inventor 钟和香张华民邱艳玲邓呈维李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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