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CH5715 Energy Conversion and Storage energy-conversion-and-storage-john-irvine/

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Presentation on theme: "CH5715 Energy Conversion and Storage energy-conversion-and-storage-john-irvine/"— Presentation transcript:

1 CH5715 Energy Conversion and Storage energy-conversion-and-storage-john-irvine/

2 Impedance Spectroscopy Introduction to EIS and process speciation

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4 Questions

5 Solid Oxide Fuel Cells: Cathode Materials and Interfacial Reactions

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7 Nature of Three Phase Boundary

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14 Investigation of role of microstructure in fuel oxidation performance Patrick Muhl Introduction ACC Anode Electrolyte Cathode CCC airH20H20 N2N2 H2H2

15 Patrick Muhl Approach Why do we care about diffusion/ concentration/ utilization - “losses” at the anode? 1. Even though they are mostly small, they are losses! 2. These losses are suspected to increase when using CH 4 ! 3. Vital in the anode supported FC design!

16 Patrick Muhl Approach RsRs R p1 R p2 R total

17 Patrick Muhl Approach constant FU)

18 t acc >> t anode, t electrolyte Patrick Muhl Introduction fuel H20H20 Total current ≠ 0 H 2 0 (CO, CO 2 ) enriched reaction zone Competition of H 2 “getting in”, versus H 2 0 (CO 2 ) “getting out” Material properties - Thickness (diffusion length) - Porosity - Tortuosity - Density - Grain size Gas properties - Diffusion coefficient - Binary or multiple molecules Operation setup - Mass flows (i.e. m H 2 ) - Temperature - Current density. Problems - Electrochemically active diffusion layer - Gas pathway (measurement setup) - Set of variables (matrix) - Clean correlation of measurements to material properties

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23 kHz Charge transfer Hz Diffusion

24 Resume of impedance – process relations CC Electrode O R Electrolyte Mass transport Warburg types

25 Questions

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