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Experimental Investigation of the Effect of Operating Pressure on the Performance of SOFC and SOEC
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2013
Year
Chemical EngineeringElectrical EngineeringEngineeringExperimental InvestigationElectrode-electrolyte InterfaceElectrolyzer CellMechanical EngineeringFundamental ElectrochemistryPressure VesselEnergy StorageGas Conversion ImpedanceElectrochemical CellLow Frequency Semi-circleElectrochemical ProcessOperating PressureElectrochemistrySorption Cooling
The effect of operating pressure on the performance of SOFC and SOEC was investigated electrochemically under pressurized and depressurized conditions (0.01-1.0 MPa) using practical size single cells. It was found that the diameter of low frequency semi-circle appears in impedance spectra was not so much affected by operating pressure with electrolyte supported cell as was expected theoretically for gas conversion impedance. On the other hand, the diameter significantly depends on the operating pressure with anode supported cell especially when the operating pressure becomes low, indicating the contribution of diffusion to the semi-circle. Numerical simulation in which diffusion processes in electrodes were considered was proposed to explain the observed behavior.