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Standard SOFC materials set for SOEC application 77%/1000 hrs 9.8%/1000 hrs 50%/1000 hrs Cell voltage Current density 0-460 hr 240-460 hr 0-240 hr 1.2 1 0.8 0.6 0.4 0.2 0 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1.5 1.0 0.5 0.0 0 100 200 300 Time, hr 1.5 1.0 0.5 0.0 400 500 10 hrs: ASR=0.27Wcm2 2180 hrs: ASR=0.28Wcm2 3553 hrs: ASR=0.29Wcm2 4076 hrs: ASR=0.30Wcm2 • • • Being tested more than 4500 hrs No degradation in first 2500 hrs Less than 1.5%/1000 hrs afterward 0 0.5 1 1.5 2 2.5 Current density (A/cm2) 10 2180 3553 4076 Time (hr) 10 hrs 2180 hrs 3553 hrs 4076 hrs • Very stable cathode material • Scheduled IR measurement Cell ASR Ohmic ASR Act ASR p_Max p_@0.7V SOFC vs. SOEC Operation – (button cells) Long-term test results comparison between two button cells tested in SOFC and SOEC modes o SOFC test (0.7 A/cm2) was interrupted on schedule to measure the ohmic losses via current-interruption o SOEC test (1 A/cm2) was frequently interrupted for refilling the water tank SOFC mode (power generation): SOEC mode (hydrogen production): no degradation in 2500 hrs, and ~ 1.5%/1000 hrs afterward Projected degradation rate ~ 50%/1000 hrs Materials and Systems Research, Inc. 12 Current density, A/cm2 Cell voltage (V) ASR (Wcm2), power density (W/cm2) Cell voltage, VPDF Image | Reversible Fuel Cells Workshop Summary Report
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