Oxygen surface exchange kinetics of erbia-stabilized bismuth oxide

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Abstract

The surface oxygen exchange kinetics of bismuth oxide stabilized with 25 mol% erbia (BE25) has been studied in the temperature and pO2 ranges 773–1,023 K and 0.1– 0.95 atm, respectively, using pulse-response 18O–16O isotope exchange measurements. The results indicate that BE25 exhibits a comparatively high exchange rate, which is rate determined by the dissociative adsorption of oxygen. Defect chemical considerations and the observed pO2 1=2 dependence of the rate of dissociative oxygen adsorption suggest electron transfer to intermediate superoxide ions as the rate determining step in surface oxygen exchange on BE25
Original languageEnglish
Pages (from-to)231-236
JournalJournal of solid state electrochemistry
Volume15
Issue number2
DOIs
Publication statusPublished - 2011

Keywords

  • METIS-273804
  • IR-76492

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