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Solid Oxide Electrochemical Technologies Fuel-electrode Supported Solid-Oxide Devices: SOFC & SOEC specializing in cell/stack materials R&D 1. Nickel+zirconia-based fuel-electrode supports: ~700 μm 5 o mechanical strength; redox-tolerance; low concentration oxygen electrode current collector oxygen electrode functional layer Electrolyte fuel electrode functional layer polarization losses; costs 2. Graded, fuel-electrode functional layer: ~ 15 μm o sulfur-tolerance; redox-tolerance 3. Thin film electrolyte: ~ 8 μm o enhanced conductivity 4. Graded, O2-electrode functional layers: ~ 20 μm o Low sheet resistance; extended three phase boundary length; improved bonding 5. O2-electrode current collector layer: ~ 50 μm o low ohmic/contact resistance 6. Metallic interconnect o low oxidation rate; low cost 7. Sealing gasket o Compliant/rigid seals; thermal expansion match; easy fabrication/assembly 4 3 2 1 50 1000 45 900 40 800 35 700 30 600 25 500 20 400 15 300 10 200 5 100 00 0 5 10 15 20 25 30 35 Stack Current, A Stack dimension 6”x6”x5” 930 W @ 30.4 A 0.764 V/cell 40-Z100 Stack (4"x4", 100 cm2) 50%H2/N2 @ 40% utilization air @ 40% utilization 800oC Materials and Systems Research, Inc. 8 Stack voltage, V Stack power, WPDF Image | Reversible Fuel Cells Workshop Summary Report
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