Solubility of Nickel Oxide in (62＋38mol％)(Li＋K） CO<sub>3</sub>　Containing Alkaline Earth Carbonates

Recently a molten carbonate fuel cell(MCFC) has been widely researched and developed from the viewpoint of the high efficiency and low level air pollution for electric power generation One of the most important problems to be solved in the MCFC RD is the nickel oxi(ie cathode dissolution which causes the niclel metal deposition in electrolyte and results in a short circuit in the MCFC Therefore the solubility of NiO in carbonate is signi f icantly impor tant The solubility of nickel oxide in alkali carbonates has been measured by Ota et al12)Baumgartner3 5)and Shresetal6)Theyreprtedthatthe dissolution mechanism of nickel oxide at high carbon dioxide pressure P(CO2)001 atm is so called the acidic dissolution as shown below 2 2 NiO CO2