| Autor: |
Luebbe, Henning, Rossen, John, Diethelm, Stefan, Van Herle, Jan, Hofmann, Heinrich, Bowen, Paul, Snijkers, Frans, Betz, Thomas |
| Zdroj: |
ECS Transactions; September 2009, Vol. 25 Issue: 2 |
| Abstrakt: |
Tubes of diameter <5mm of a nickelate cathode material of composition Nd1.95NiO4 were prepared by cold-isostatic pressing (CIP) and extrusion. These tubes are intended as cathode support structure for micro-tubular SOFCs at reduced working temperatures around 700{degree sign}C. The characteristics of these tubes - porosity, pore size, geometric dimensions and surface roughness - were measured by various techniques such as mercury intrusion, SEM-Imaging and with an in-house built diffusion setup. Diffusion measurements yielded average pore sizes of 0.12 μm for CIP-ed tubes and 0.22 μm for extruded tubes. Estimation of the loss due to oxygen diffusion has shown that the wall thickness of CIP-ed tubes must be reduced prior to coating processes in order to limit oxygen concentration overpotential loss during operation. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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