Abstract
A novel oxygen negative ion source named solid oxide ion source (SOIS) is proposed. To demonstrate its concept, thermionic emission of oxygen negative ions, from a bare surface of yttria-stabilized zirconia (YSZ) was studied with a mass spectrometer capable of detecting negative ions. The emission current was investigated at the temperature range 750 to 950°C under pressures of about to ions proved to be emitted into a vacuum from the bare YSZ surface at elevated temperatures. The emission current increased with temperature and applied voltage. From Richardson-Dushman plots, activation energy of the thermionic emission was estimated to be about 2 eV. In continuous operation, the emission current decreased with time, finally approaching zero; however, after intervals, the current recovered. On the basis of the results, a model for explaining the emission mechanism of ions is proposed. The model is based on three key processes occurring on the surface of electrolytes: (1) formation of ions on the surface by electron capture of oxygen atoms provided by the migration of oxide ions across electrolytes, (2) accumulation of ions on the surface, and (3) emission of ions from the surface. © 2003 The Electrochemical Society. All rights reserved.
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