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Gas diffusion electrode assembly and its production

A gas diffusion electrode, diffusion electrode technology, applied in the direction of electrolysis components, electrodes, electrolysis process, etc., can solve problems such as leakage, deformation, difficult operation, etc.

Inactive Publication Date: 2005-11-30
古屋长一 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been found that the size is 1m 2 or larger electrode plates have some problems: for example, it is difficult to obtain such a large electrode in the form of a single electrode plate; due to the low mechanical strength of the gas diffusion electrode, it is difficult to handle and therefore easily deformed by its own weight; Difficult to provide sufficient charge to the gas diffusion electrode only through its periphery
[0008] The joint between the gas diffusion electrode and the electrolytic cell feeder, especially the gas diffusion electrode part with low joint strength, is prone to liquid leakage after long-term operation in high-temperature and high-concentration alkaline soda solution

Method used

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  • Gas diffusion electrode assembly and its production
  • Gas diffusion electrode assembly and its production
  • Gas diffusion electrode assembly and its production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Add 2 parts of hydrophobic carbon black in 200 parts by weight (the following parts are all expressed by weight) of 4% (weight) (the following percentages are all expressed by weight) of TRITON X-100 (surfactant) (Denka Black; average particle diameter of 390 Å, manufactured by Denki Kagaku Kogyo K.K.). The resulting mixture was stirred to disperse the carbon black. The carbon black dispersion was treated with an ultrasonic disperser (manufactured by BRANSON; 500 W) for 5 minutes and cooled with water to further disperse the carbon black. As a result, the particles in the dispersion were dispersed with an average particle diameter of 1.6 µm. To this dispersion liquid was added 10 parts of silver sol (test product produced by Tanaka Kikinzoku Kogyo K.K.; average particle diameter: 0.1 µm). The mixture was stirred to homogenize. Then, 1.5 parts of PTFE dispersion D-1 (average particle diameter: 0.3 µm; produced by Daikin Industries, Ltd.) was added and the mixture was ...

Embodiment 2

[0113] In Example 1, the gas diffusion electrode 1 was produced by hot pressing and then bonded to the silver sheet 7 (the term "silver sheet 7" is used because "silver sheet" is used here as the bordering material). However, in the present embodiment, the silver-rimmed gas diffusion electrode assembly is obtained by combining the reaction layer / gas gas layer sheet, the silver wire mesh as the collection layer 7, the silver sheet 7 and the gas gas layer sheet 3b Stacked in this order, at 350°C at 50 kg / cm 2The assembly was pressed for 60 seconds. The electrolysis of sodium chloride was performed using the electrode assembly as an oxygen cathode. As a result, at 90°C, 32% NaOH and 30A / dm 2 A cell voltage of 1.96V was obtained under the conditions.

[0114] The electrode assembly produced in this embodiment has a structure in which a border material is inserted between the air intake layer sheet 3a and the air intake layer sheet 3b.

Embodiment 3

[0116] From a 0.2mm thick rectangular silver piece of 13cm x 23cm, the interior was cut out with a size of 10cm x 20cm so that the peripheral portion of the silver piece was kept in the shape of a long and narrow strip with a width of 1.5cm to produce a silver frame. A gas diffusion electrode having a size of 11.5 cm x 21.5 cm was obtained in the same manner as in Example 1, in which the peripheral portion of the silver mesh had been bent toward the reaction layer side. Fine silver particles were applied to the surface of the curved peripheral portion of the silver mesh. The silver frame obtained above was superimposed thereon. at 100 kg / cm 2 The laminated part was hot-pressed at the area pressure of 260° C. to obtain a gas diffusion electrode with a silver frame.

[0117] The electrical resistance between the silver frame and the gas-diffusion electrodes was low, about half that of a corresponding conventional assembly without intercalated fine silver particles. The peel s...

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Abstract

A gas diffusion electrode assembly comprising: a gas diffusion electrode; and a metallic or resinous edging material bonded to a peripheral part of the electrode. The invention also relates to a gas diffusion electrode assembly comprising: a gas diffusion electrode; and a metallic terminal bonded to the electrode. The invention further relates to a gas diffusion electrode assembly comprising: a gas diffusion electrode; and a structure for connection, which comprises a combination of a thin silver sheet and a reinforcing material comprising a tough metal as a base, the structure for connection being bonded to a peripheral part of the gas diffusion electrode. Also disclosed are processes for producing these gas diffusion electrode assemblies.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of February 16, 2000, an application number of CN00102618.6, and an invention title of "Gas Diffusion Electrode Assembly and Its Production Method". technical field [0002] The present invention relates to gas diffusion electrode assemblies comprising gas diffusion electrodes and metal joints, metal trim materials, resin trim materials or connection structures bonded thereto, and methods for producing these electrode assemblies. More particularly, the present invention relates to gas diffusion electrode assemblies having attached metal joints, edging materials or connecting structures which, when used as gas diffusion electrodes for the electrolysis of sodium chloride, are readily attached to the electrode base and Easy to collect electrons. The invention also relates to a method of producing the electrode assembly and a method of incorporating silver material on the c...

Claims

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Application Information

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IPC IPC(8): C25B9/23C25B11/00
Inventor 古屋长一
Owner 古屋长一
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