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Chapter 5. Aspects of Metal-YSZ Electrode Kinetics 122 Figure 5-7. SEM micrographs showing the matching topographical patterns within the metal-YSZ interface on (a) the metal surface (Ni wire in this case), and (b) the YSZ surface. Strictly speaking, if any morphological changes happen at the TPB during a test, this method may not accurately estimate the TPB length for those times in the test. For example, both of the extreme conditions of oxidation and strong cathodic polarization (section 5.3.5) seem to change the TPB length either by inducing the formation of a finer microstructure (perhaps temporarily) or freeing the TPB from segregated impurities that were blocking it. Therefore, the normalized data from after those events most likely underestimates the TPB length, but since the contact area did not change and a zoomed-out view of the TPB most likely looks the same, it is still useful as an indication of the degree of activation that occurred as a result of those phenomena. Note that the contact area has a different meaning than the nominal area usually discussed in regards to three-dimensional porous electrodes. For porous electrodes, the TPB length cannot be accurately determined, so the nominal geometric area of the porous structure is used for normalization, keeping in mind that only a small fraction of this area comprises the active reaction sites. For the point-contact cell geometry, while the contact area is clearly not useful for normalizing the polarization resistance, it is still useful for normalizing the capacitance across the metal-YSZ contact [6].PDF Image | Electrolysis of CO2 and H2O
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