Measuring individual overpotentials in an operating solid-oxide electrochemical cell

Details Measuring individual overpotentials in an operating solid-oxide electrochemical cell Measuring individual overpotentials in an operating solid-oxide electrochemical cell

2010-02-26

arxiv.org/abs/1003.0035v2

Physics

Chemical Physics

corrected; Phys. Chem. Chem. Phys., 2010

Scientific paper

10.1039/C003581E

We use photo-electrons as a non-contact probe to measure local electrical potentials in a solid-oxide electrochemical cell. We characterize the cell in operando at near-ambient pressure using spatially-resolved X-ray photoemission spectroscopy. The overpotentials at the interfaces between the Ni and Pt electrodes and the yttria-stabilized zirconia (YSZ) electrolyte are directly measured. The method is validated using electrochemical impedance spectroscopy. Using the overpotentials, which characterize the cell's inefficiencies, we compare without ambiguity the electro-catalytic efficiencies of Ni and Pt, finding that on Ni H_2O splitting proceeds more rapidly than H2 oxidation, while on Pt, H2 oxidation proceeds more rapidly than H2O splitting.

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