Abstract
Dissolution of metal oxides in molten carbonates relates directly to the stability of materials for electrodes and construction of molten carbonate fuel cells. In the present work the solubilities of PbO, NiO, , and in molten Li/K carbonates have been measured at 650°C under carbon dioxide atmosphere. It is found that the solubilities of NiO and PbO decrease while those of and remain approximately constant as the lithium mole fraction increases from 0.43 to 0.62 in the melt. At a fixed composition of the melt, NiO and PbO display both acidic and basic dissolution as the partial pressure of carbon dioxide varies. By combination of solubility and electromotive force measurements, a model is constructed assuming the dissolution involves complex formation. The possible species for lead are proposed to be and/or . A similar complex chemistry for nickel oxide dissolution might be expected. © 1999 The Electrochemical Society. All rights reserved.
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