Universita′ Degli Studi Di Milano

Euteco, S.p.a.

Fondazione Cassa Di Resparmio Delle Province Lombarde

Leonardo Formaro

Luciano Cavalli

Artemio Gellera

Pierluca Messina

Mariangela Longhi

Ivano Galbiati

Marco Fraschini

The invention concerns new catalysts for the reduction of oxygen suitable for PEM fuel cells, the process for their preparation and their use in other electrolytic processes.

Catalysts free from noble metals suitable for the electrochemical reduction of oxygen

The concentration of sodium metal in a flow of mercury-sodium amalgam is measured by flowing an aqueous solution of sodium chloride through a conduit of electrically insulating material terminating with a porous septum or a capillary immersed in the flow of mercury-sodium amalgam, at a rate of at least 4 ml per hour and per cm.sup.2 of surface area of contact between the surface of the porous septum or the section of the capillary opening and the amalgam, and monitoring the electromotive force generated between said amalgam and a calomel or silver-silver chloride reference electrode located within said conduit and in contact with said solution.

Method for measuring the concentration of sodium in a flow of

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Milan, Italy

Leonardo Formaro