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Characterization of a 100 cm2 Class Molten Carbonate Fuel Cell with Current Interruption
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1998
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Relaxation ProcessEngineeringEnergy ConversionPotential RelaxationGasificationFuel ScienceChemistryPower CellChemical EngineeringPulse PowerAlternative FuelMaterials ScienceElectrical EngineeringBattery Electrode MaterialsEnergy StorageEnergy EngineeringEnergyElectrochemical ProcessElectrochemical CellCurrent InterruptionElectrochemistryFuel CellsBatteriesChemical Kinetics
A current‐interrupter method has been employed to measure the potential relaxation from output to open‐circuit voltage (OCV). The relaxation process represents the voltage losses of molten‐carbonate fuel cells which are composed of ohmic loss (ηIR), reaction overpotential (ηRe), and Nernst loss (ΔEloss). The responses of current interruption for a 100 cm2 class Li‐Na carbonate fuel cell were measured as functions of temperature, gas utilization, and oxidant gas composition . The single cell showed three different relaxation patterns of time regions during potential decay to OCV; the shortest time region (less than 20 μs) is due to ηIR, an intermittent time region (20 μs to 150 ms) is due to ηRe, and the residual time region is due to ΔEloss. The further analysis of ηRe data is consistent with the argument that the oxygen reduction reaction in the single cell is controlled by a mixed diffusion process of superoxide ion and .