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Preparation method of gas diffusion electrode for producing formic acid by electrochemical reduction of CO2

A gas diffusion electrode, electrochemical technology, applied in the direction of electrode, electrode shape/type, electrolysis process, etc., can solve the problems of low solubility, mass transfer rate inhibiting electrochemical reduction efficiency, and restricting the development and application of electrochemical reduction.

Inactive Publication Date: 2014-04-23
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CO 2 The solubility in water-soluble electrolyte is very low (0.33mol / L, standard state), the limited mass transfer rate and concentration polarization phenomenon seriously inhibit the efficiency of electrochemical reduction, which limits the electrochemical reduction of CO 2 Further development and application of formic acid production

Method used

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  • Preparation method of gas diffusion electrode for producing formic acid by electrochemical reduction of CO2
  • Preparation method of gas diffusion electrode for producing formic acid by electrochemical reduction of CO2
  • Preparation method of gas diffusion electrode for producing formic acid by electrochemical reduction of CO2

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Effect test

Embodiment 1

[0026] An electrochemical reduction of CO 2 The preparation method of the gas diffusion electrode of formic acid, the steps are as follows:

[0027] 1) Add 0.9g of powdered conductive carbon black to 80mL of absolute ethanol until completely submerged and dispersed evenly. After ultrasonic stirring at room temperature for 20 minutes, add 2.1g of 60wt% polytetrafluoroethylene (PTFE) emulsion dropwise, and continue ultrasonic stirring for 20 minutes. , the resulting mixture was subjected to 80 o C water bath and stir until it forms a mass, then roll it into a film to obtain a diffusion layer film;

[0028] 2) After the 60-80 mesh copper mesh is degreased, washed with water, pickled with 10wt% dilute hydrochloric acid, and washed with water, it is put into the chemical tin plating solution. The chemical tin plating solution is a mixture of stannous sulfate, sulfuric acid and thiourea. Mixed solution, the concentrations of stannous sulfate, sulfuric acid and thiourea in the mixe...

Embodiment 2

[0035] An electrochemical reduction of CO 2 The preparation method of the gas diffusion electrode of formic acid, the steps are as follows:

[0036] 1) Add 0.9g of powdered conductive carbon black to 80mL of absolute ethanol until completely submerged and dispersed evenly. After ultrasonic stirring at room temperature for 20 minutes, add 2.1g of 60wt% polytetrafluoroethylene (PTFE) emulsion dropwise, and continue ultrasonic stirring for 20 minutes. , the resulting mixture was subjected to 80 o C water bath and stir until it forms a mass, then roll it into a film to obtain a diffusion layer film;

[0037] 2) After degreasing, washing with water, pickling with 10wt% dilute hydrochloric acid, and pretreatment with water, put the 60-80 mesh copper mesh into the electroplating tin bath, which is the mixture of stannous chloride, sodium citrate and hydrochloric acid Mixed solution, the concentrations of stannous chloride, sodium citrate and hydrochloric acid in the mixed solution ...

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Abstract

The invention relates to a preparation method of a gas diffusion electrode for producing formic acid by electrochemical reduction of CO2. The preparation method comprises the following steps: 1) adding anhydrous ethanol into powdery conductive carbon black till the powdery conductive carbon black is completely immersed, adding a polytetrafluoroethylene emulsion, performing reaction in a water bath, stirring till the formation of a lump, and then pressing by a roller to form a film, namely a diffusion layer film; 2) deoiling, acid-washing, tinning and drying a copper net to obtain a tinned copper net current collector; and 3) covering the diffusion layer film on the tinned copper net current collector, pressing by the roller, then cutting for formation, placing into a muffle furnace and calcining at the temperature of 3400 DEG C for 20-30min to prepare a target object. The preparation method provided by the invention has the advantages that according to the preparation method of the gas diffusion electrode, CO2 diffusion and mass transfer are strengthened by changing a CO2 transmission path and way of electrochemical reduction reaction of the CO2; and the preparation method has the advantages of simple process and low cost of raw materials, the prepared gas diffusion electrode has high mechanical strength, the electrochemical reduction efficiency of the CO2 is high, and the preparation method is suitable for engineering applications of electrochemical reduction of the CO2.

Description

technical field [0001] The invention relates to the technical field of applied chemistry-energy saving and emission reduction, in particular to an electrochemical reduction CO 2 A method for preparing a gas diffusion electrode for producing formic acid. Background technique [0002] Currently, CO in the atmosphere 2 The resulting greenhouse effect has become one of the most concerned environmental issues in the world. To reduce CO 2 content, through a variety of technical means to reduce CO 2 Recycling is the most efficient way. Among various treatment methods, the electrochemical reduction method consumes less energy and can react under suitable temperature and atmospheric pressure conditions. During the reaction process, the selective synthesis of products can be realized by controlling the electrodes and reaction conditions. application prospects. [0003] CO 2 There are various products of electrochemical reduction, such as carbon monoxide, formic acid, formaldeh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/04C25B3/04C25B3/25
Inventor 于宏兵汪启年董恒于晗
Owner NANKAI UNIV
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