Six La1-xSrxCoO3- (x= 0, 0.05, 0.15, 0.25, 0.35, 0.50) perovskites were synthesised and characterised by powder XRD and cyclic voltammetry on cone-shaped electrodes in either air or nitric oxide in argon at 200, 300 and 400oC. At 200oC the current densities in air was highest for the strontium free cobaltite, whereas the current densities was highest for La0.95Sr0.05CoO3- in the nitric oxide containing atmosphere. This was also the compound with the highest INO/IO2 current ratio at 200oC. At higher temperatures a limiting cathodic current was observed for all of the cobaltite’s, except La0.50Sr0.50CoO3-, in both air and the nitric oxide containing atmosphere. This was attributed to a rate limiting chemical step (i.e. dissociation of oxygen or nitric oxide) in the reaction sequence.
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