Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 38, Pages 12138-12145Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c003581e
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Funding
- U. S. Department of Energy [DE-AC04-94AL85000]
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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(2)O splitting proceeds more rapidly than H(2) oxidation, while on Pt, H(2) oxidation proceeds more rapidly than H(2)O splitting.
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