Ambient pressure X-ray photoelectron spectroscopy (XPS) was used to measure local overpotentials and potential gradients across all components of a CeO2-x/YSZ/Pt solid oxide electrochemical cell operating at 700 �C.  XPS photoelectron kinetic energy shifts were measured at various applied biases and are proportional to the local electric potentials (VL).  We used the mixed ionic / electronic conductor (MIEC) CeO2-x as the working electrode to spatially resolve the active electrochemical regions of the cells by monitoring the Ce3+/Ce4+ oxidation state changes of the active ceria surfaces.

In situ X-ray photoelectron spectroscopy for direct measurement of local overpotentials and active electrochemical regions in solid oxide electrochemical cells

239th National Meeting (2010)

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