Method of manufacturing gas diffusion electrodes

一种气体扩散电极、导电载体的技术，应用在电极制造、电极、电池电极等方向

Active Publication Date: 2006-12-20
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention also enables the production of both single-layer and multi-layer gas diffusion electrodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The preparation of the powder mixture according to (a) is effected by mixing powdered catalyst and binder and optionally further components. It is preferably prepared in an apparatus with rapidly rotating mixing elements, such as a fly cutter. For mixing the components of the powder mixture, the mixing elements preferably rotate at a speed of 10-30 m / s or 4000-8000 rpm. If a catalyst such as silver(I) oxide is mixed with PTFE as binder in such a mixing device, the PTFE is drawn into a thread-like structure and thus acts as a binder for the catalyst. After mixing, the powdery mixture is preferably sieved, preferably by a sieving device equipped with a gauze or similar having a mesh size of 0.1-1.5 mm, more preferably 0.2-1.2 mm sieve.

[0018] In another embodiment of the method according to the invention, after mixing the catalyst and the binder in the mixing device, the powder mixture is compacted, for example pressed by means of rollers. The flakes formed in this w...

Embodiment

[0030] 3.5 kg of a powder mixture prepared from 7% by weight of PTFE powder, 88% by weight of silver(I) oxide and 5% by weight of silver powder type 331 from Ferro were mixed in a mixer type R02 from Eichrich at a speed of 6000 rpm, Wherein the mixer is equipped with star turbulators as mixing elements such that the temperature of the powder mixture does not exceed 55°C. This is achieved by interrupting the mixing process and allowing the powder mixture to cool. Mixing was performed in a total of three passes. After mixing, the powder mixture was compacted by means of rollers at a pressure of 0.6 kN / cm. The resulting flakes were further mixed three times using an Eichrich mixer. The mixing temperature does not exceed 55°C. After mixing, the powder mixture was passed through a sieve with a pore size of 1.0 mm. The sieved powder mixture is then applied to a conductive support. The support was a nickel gauze with a wire thickness of 0.14 mm and a pore size of 0.5 mm. This w...

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PUM

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Abstract

The invention describes a process for the manufacture of a gas diffusion electrode involving preparing a powder mixture containing at least a catalyst and a binder, applying the powder mixture to an electrically conducting support, and pressing the powder mixture with the electrically conducting support.

Description

field of invention [0001] The invention relates to a method for producing a gas diffusion electrode from an electrically conductive carrier and a powder mixture containing at least a catalyst and a binder. Gas diffusion electrodes are suitable for use in, for example, sodium chloride electrolysis or alkaline fuel cells. Background of the invention [0002] It is known from DE3710168A and EP297377A that it can be prepared by first rolling a dry powder mixture containing catalyst and binder and optionally other components to form a sheet-like material and then applying the sheet-like material to an electrically conductive support by rolling Gas Diffusion Electrodes. In addition to its mechanical function, the carrier is also used to transfer electrical current to or from the gas diffusion electrode. The mechanical support may be, for example, a wire mesh or a non-woven or woven metal fabric. The sheet-form material can be applied to the carrier by, for example, extrusion or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/00H01M4/88H01M4/90
CPCH01M4/0404H01M4/9016Y02E60/50C25B11/035H01M4/8605H01M8/083Y02P70/50Y02E60/10C25B11/031B22F3/02B22F7/004H01M4/8807
Inventor A·布兰
Owner COVESTRO DEUTSCHLAND AG
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