Gas diffusion electrodes, electrochemical cells and methods exhi

Details Gas diffusion electrodes, electrochemical cells and methods exhi Gas diffusion electrodes, electrochemical cells and methods exhi

1987-05-11

1988-11-29

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204130, 204294, 429 40, 429 43, C25B 1100

Patent

active

047879645

ABSTRACT:
Gas diffusion electrodes, gas generating or consuming electrochemical cells utilizing such electrodes, and a method of preparing such electrodes are disclosed. The electrode comprises an electronically conductive porous body defining respective gas and electrolyte contacting surfaces. The electrode is prepared by forming the porous body, disposing the electrolyte contacting surface in contact with an electrolyte, and contacting the gas contacting surface with a gaseous atmosphere. Current is passed through the porous body at a degree of electrode polarization much higher than normal whereby modification of the electrode material is effected. If desired, a catalyst may be incorporated in the electrode and is subjected to pretreatment as well. The inventive electrodes exhibit superior voltage performance under oxygen polarization conditions.

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