Abstract: The invention disclosed is a catalyst composition for an air cathode for use in an electrochemical cell, in particular in alkaline electrolyte metal-air e.g. zinc-air, fuel cells. The catalyst composition comprises an active material CoTMMP and silver, supported on carbon wherein the ratio of silver to CoTMPP is 1:1 to 2.4:1. Optional ingredients include a hydrophobic and a hydrophobic bonding agent, MnO2, WC/Co or both. The catalyst composition is supported on microporous support layer and nickel foam or mesh to form an air cathode.

Abstract: The invention disclosed is a catalyst composition for an air cathode for use in an electrochemical cell, in particular in alkaline electrolyte metal-air e.g. zinc-air, fuel cells. The catalyst composition comprises an active material CoTMMP and silver, supported on carbon wherein the ratio of silver to CoTMPP is 1:1 to 2.4:1. Optional ingredients include a hydrophobic and a hydrophobic bonding agent, MnO2, WC/Co or both. The catalyst composition is supported on microporous support layer and nickel foam or mesh to form an air cathode.

Abstract: An electrode for electrolysis of solutions of electrolytes comprising a support of passivated film forming metal or alloy thereof, having a composite coating consisting essentially of oxides of metals selected from the group consisting of iridium, ruthenium, titanium and tantalum having the molecular ratios (IrO.sub.2 +RuO.sub.2):TiO.sub.2 +Ta.sub.2 O.sub.5) is (1-19):(3-1) wherein IrO.sub.2 :RuO.sub.2 is (24-4):1, and TiO.sub.2 :Ta.sub.2 O.sub.5 is 1:(0-0.05). The electrodes are of particular use as anodes in the production of chlorine and alkali, electrosynthesis of chlorates and hypochlorites, electrolysis of sea and waste water and cathodic protection. The electrodes have improved corrosive resistant to alkaline solutions and have improved interface stability to oxidation and blocking.