Gelatin hole forming method for gas diffusion electrodes

A gas diffusion electrode, gelatin technology, applied in the direction of electrode shape/type, etc., can solve the problems of damage to electrode performance and life, long time consumption, low decomposition temperature of ammonium salt, etc. Uniform and stable electrode structure

Active Publication Date: 2012-06-27
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned pore-forming agents still have certain defects in the pore-forming process of the electrode. For example, the decomposition temperature of the ammonium salt is low, and most of it will decompose and volatilize during the early drying process of the electrode, and cannot continue to form after the electrode is cold-pressed. Pores, resulting in insufficient porosity of the electrode
For inorganic salts that are difficult to decompose by heating, the extraction method of heating and boiling distilled water to reflux to dissolve inorganic salts is generally used. This method is complex and time-consuming, and high-temperature distilled water will destroy the internal structure of the gas diffusion electrode during the extraction process, thereby damaging the electrode. performance and longevity

Method used

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  • Gelatin hole forming method for gas diffusion electrodes
  • Gelatin hole forming method for gas diffusion electrodes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add gelatin preparation process, wherein the mass ratio of gelatin and carbon black in the electrode component is 1%:

[0023] (1) Preparation of the diffusion layer: Add 20 mL of triton aqueous solution with a mass concentration of 4%, 1 mL of a gelatin aqueous solution with a mass fraction of 2%, 20 mL of isopropanol, and 2 g of hydrophobic carbon black in a beaker, and ultrasonically disperse the three to mix evenly , then add 2mL of 60% PTFE emulsion, use a homogenizer to shear and disperse for 0.5h, and then use a cell pulverizer to disperse ultrasonically for 10min to form a uniform slurry, coat the obtained slurry on the nickel foam and bake it at 60-80°C Cold pressing after 0.5 hours to obtain a diffusion layer;

[0024] (2) Preparation of catalytic layer: first add 10mL 4% triton aqueous solution, 0.5mL mass fraction 2% gelatin aqueous solution, 20mL isopropanol in the container successively, ultrasonic dispersion makes the three mix uniformly, then add 1g prop...

Embodiment 2

[0027] Add gelatin preparation process, wherein in the electrode component, the mass ratio of gelatin and carbon black is 2%:

[0028] (1) Preparation of the diffusion layer: Add 20 mL of triton aqueous solution with a mass concentration of 4%, 2 mL of a gelatin aqueous solution with a mass fraction of 1%, 20 mL of isopropanol, and 2 g of hydrophobic carbon black in a beaker, and ultrasonically disperse the three to mix evenly , then add 2mL of 60% PTFE emulsion, use a homogenizer to shear and disperse for 0.5h, and then use a cell pulverizer to disperse ultrasonically for 10min to form a uniform slurry, coat the obtained slurry on the nickel foam and bake it at 60-80°C Cold pressing after 0.5 hours to obtain a diffusion layer;

[0029] (2) Preparation of catalytic layer: First add 10mL 4% triton aqueous solution, 1mL mass fraction 1% gelatin aqueous solution, 20mL isopropanol in the container, and ultrasonically disperse the three to mix evenly, then add 1g hydrophilic Carbo...

Embodiment 3

[0032] Add gelatin preparation process, wherein in the electrode component, the mass ratio of gelatin and carbon black is 3%:

[0033](1) Preparation of the diffusion layer: Add 20 mL of triton aqueous solution with a mass concentration of 4%, 3 mL of a gelatin aqueous solution with a mass fraction of 2%, 20 mL of isopropanol, and 2 g of hydrophobic carbon black in a beaker, and ultrasonically disperse the three to mix evenly , then add 2mL of 60% PTFE emulsion, use a homogenizer to shear and disperse for 0.5h, and then use a cell pulverizer to disperse ultrasonically for 10min to form a uniform slurry, coat the resulting slurry on the nickel foam and bake it at 60-80°C Cold pressing after 0.5 hours to obtain a diffusion layer;

[0034] (2) Preparation of catalytic layer: first add 10mL 4% triton aqueous solution, 1.5mL mass fraction 2% gelatin aqueous solution, 20mL isopropanol in the container successively, ultrasonic dispersion makes the three mix uniformly, then add 1g pro...

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Abstract

A gelatin hole forming method for gas diffusion electrodes belongs to the field of energy. The gelatin hole forming method includes steps of firstly coating Triton water solution with concentration of 4%, isopropanol, hydrophobic carbon black, 1% to 2% of gelatin water solution and 60% of PTFE (poly tetra fluoro ethylene) emulsion to foaming nickel so as to prepare a diffusion layer; coating 4% of Triton water solution, the isopropanol, 1% to 2% of gelatin water solution, 60% of PTFE emulsion, hydrophilic carbon black and silver / carbon catalyst onto the diffusion layer to form a catalyzing layer; heating gelatin to be carbonized and decomposed to form holes after one-hour heat treatment at the temperature ranging from 200 DEG C to 300 DEG C, and finally forming the electrodes in a hot pressing manner at the temperature of 360 DEG C. Electrode holes formed by the method are uniform in structural distribution and high in hole rate, the average radius of the electrode holes ranges from 20nm to 30nm, the electrodes are stable in structures and performance thereof is improved evidently.

Description

technical field [0001] The invention relates to a method for forming pores in a gas diffusion electrode through thermal decomposition of gelatin, which belongs to the field of energy. Background technique [0002] With the development of the economy, energy problems are becoming more and more prominent, so it is particularly important to improve the efficiency of energy utilization. Among them, the oxygen cathode is a gas diffusion electrode with oxygen as the cathode active material, which is an electrode that reduces oxygen to generate water or hydroxide in the electrode catalytic reaction layer. Compared with the hydrogen evolution cathode used in the traditional chlor-alkali electrolysis industry, since the oxygen reduction potential is more positive than the hydrogen evolution potential, if the oxygen cathode replaces the traditional hydrogen evolution electrode, the cell voltage can be reduced to save electricity. [0003] At present, in the preparation process of thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03
Inventor 王峰徐承宗刘景军黄雅钦王建军张良虎覃事永
Owner BEIJING UNIV OF CHEM TECH
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