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The decay rate of the MCFC stacks was analyzed with the decay rate of the single cells operated over more than 10,000 hours. Out of 4-5mV/1000hours of the decay rate of standard stacks, 0.4mV was estimated as the contribution of the interfacial resistance because of the corrosion of cathode current collectors. Moreover, 0.8 to 1.6mV/1000hours was attributed to the performance decay due to the dissolution of the NiO cathodes. The rest of the decay rate about 3mV/ 1000hours was assumed as the effect of the electrolyte loss. Therefore, the reduction of the electrolyte loss was thought to be the most important counter measure to reduce the decay rate. 60% of the standard electrolyte loss was assumed to be the target to achieve the decay rate of 2mV/1000hours. Moreover, using the Li/Na carbonate which has lower solubility of Ni and higher ionic conductivity, the target was expected to be 70% of the electrolyte loss of the standard stacks.

Analysis of the Factors of the Performance Decay Rate of Molten Carbonate Fuel Cells