Abstract
Oxygen isotope exchange and time-of-flight secondary-ion mass spectroscopy were used to visualize the oxygen pathway in a silver cathode for solid-oxide fuel cells. 18O was electrochemically transferred into the electrolyte through the silver cathode and immobilized by quenching. The three-dimensional distributions of 16O, 18O, 107Ag, 109Ag, and GaO were analyzed by secondary-ion mass spectroscopy. The oxygen pathway was determined as follows: oxygen atoms were placed uniformly on the silver cathode surface, diffused along the silver grain boundaries from the surface to the Ag/electrolyte interface, spread through the entire interface, were ionized, and transferred into the electrolyte.
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