Oxygen Reduction Mechanism in Molten Carbonates by Current Double Pulse Method

Abstract

Oxygen reduction mechanism on Au meniscus electrode in molten Li-Na carbonate at 650°C has been studied by analyzing the electrode reaction resistance measured with current double pulse method. The meniscus electrode composed of Au gauze were adhered onto the molten carbonates electrolyte tyle and sprayed CO₂-O₂-N₂ mixed reactant gases at the flow rate of 100cm³/min, Investigating the dependencies of the electrode reaction resistances on CO₂, O₂ partial pressure and the i-V relations for O₂ reduction, it was assumed to be atomic O formed by dissociation of O₂ molecules at the electrode interface as the electrochemical reduction species.