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The stability of NiO and oxidized nickel-niobium surface alloy electrode under various molten carbonate fuel cell(MCFC) cathode conditions were investigated by determination of equilibrium solubility of nickel ions in the carbonate melt of the two electrode materials.It is found that under MCFC cathode conditions the stability of NiO electrode is improved significantly by the deposition of niobium.As far as stability is conced,oxidized nickel-niobium alloy electrode can be considered as a candidate for cathode material of MCFC.