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2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 Cyclic SOFC/SOEC degradation • ~70mV/1000hourSOECdegradation • ~90mV/1000hourSOFCdegradation • ~4xworsethanstraightSOFC SOEC Degradation rate = 70mV/1000hrs Electrolysis OCP Fuel cell Operational Conditions SOFC SOEC 0.5 0.5 A/cm2 Current Temperature 750 750 °C SOFC Degradation rate = 90mV/1000hrs Pressure Active area H2 flow N2 flow H2O flow utilization 89 89 kPa 81 81 cm2 0.608 0 slpm 0.608 0.608 slpm 0 0.580 slpm 50% 52% GLOB 101659 - SOFC-SOEC Cycles TSC-2 Cell 0 20 40 60 80 100 120 Time (days) Compare to 91 mV/khr steady state EL degradation for material system -> Cyclic operation does not appear to be driving degradation -> EL degradation is showing up on FC portion of cycle Early TSC2 Cyclic Testing Cell Voltage (V) Copyright © 2011 Versa Power Systems – All Rights ReservedPDF Image | Reversible Fuel Cells Workshop Summary Report
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