It has been confirmed that and O 2− are the cathode products and and O 2 the anode products of electrolyzing at 550°C. In the presence of oxide, is oxidized at platinum to by a 6−electron process involving the substrate metal. Ag + /Ag is a satisfactory reference electrode for the concentration range . Formal potentials of other systems on a molal scale are: , , , , . Several other metals corrode or are noble. Ag is corroded by mixtures to a saturation concentration of . On cooling solutions of Ag + in , a black precipitate of metal is obtained. The bearing of these observations on the corrosion of carbonate fuel cell cathodes is discussed.
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Bartlett et al. (1967) studied this question.
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