Electrochemical cell with gas diffusion electrodes

Details Electrochemical cell with gas diffusion electrodes Electrochemical cell with gas diffusion electrodes

C - Chemistry, Metallurgy

25

B

C25B 9/08 (2006.01) C25B 15/08 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2466498

A membrane electrolysis cell comprising an anodic compartment and a cathodic compartment is described, wherein at least one of the two compartments contains an electrode fed with gas and a porous planar element is interposed between the membrane and the gas-fed electrode. A flow of chemically aggressive electrolyte crosses the porous planar element downwards under the effect of the gravity force. The planar element consists in a plastic element withstanding the aggressive operative conditions: The use of perfluorinated plastics such as ECTFE, PTEFE, FEP, PFA is preferred, even though they are strongly hydrophobic. When the gas-fed electrode is a cathode and the gas contains oxygen, the gas crosses the cathodic compartment upwardly so as to minimise the risk of hydrogen build up. The cell equipped with the oxygen cathode is particularly advantageous for the sodium chloride electrolysis.

L'invention porte sur une cellule électrolytique à membrane comprenant un compartiment anode et un compartiment cathode, au moins l'un des deux compartiments contenant une électrode alimentée en gaz et un élément plat poreux placé entre la membrane et l'électrode alimentée en gaz. Un flux d'électrolyte agressé chimiquement traverse de haut en bas l'élément plat poreux sous l'effet de la force de gravité. L'élément plat est constitué d'un élément en plastique résistant aux conditions de fonctionnement agressives, à savoir l'utilisation préférée de plastiques perfluorés tels que ECTFE, PTEFE, FEP, PFA, même si ces plastiques sont fortement hydrophobes. Lorsque l'électrode alimentée en gaz est une cathode et que le gaz renferme de l'oxygène, le gaz traverse de bas en haut le compartiment cathodique de façon à minimiser le risque de formation d'hydrogène. La cellule équipée de la cathode d'oxygène est notamment avantageuse pour l'électrolyse du chlorure de sodium.

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