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Promotion of Oxygen Surface Reaction at the Hetero-Interface of (La,Sr)CoO3 / (La,Sr)2CoO4
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2007
Year
EngineeringSolid-state ChemistryOxygen Surface ReactionOxygen IsotopeDeoxygenationChemistryOxygen Isotope ExchangeCalcium AluminateOxide HeterostructuresMaterials ScienceInorganic ChemistryIsotope Exchange ExperimentLayered FilmsCatalysisCrystallographyElectrochemistryOxygen Reduction ReactionSurface ChemistryHeterogeneous CatalysisFunctional MaterialsSurface Reactivity
The preferential site for oxygen isotope exchange was investigated on layered films of (La2-xSrx)CoO4 (x = 0.5, 1.0) / (La0.6Sr0.4)CoO3 prepared by PLD on a polycrystalline Ce0.9Gd0.1O1.95. An isotope exchange experiment was performed at 723 K in 18O enriched oxygen of 0.2 ×105 Pa. Three- dimensional imaging of Secondary Ion Mass Spectrometry (SIMS) was carried out to visualize the isotope distribution. The SIMS image suggested that there are fast oxygen-incorporation paths along the triple phase boundary of (La2-xSrx)CoO4/(La0.6Sr0.4) CoO3/oxygen. The results have reproduced our former results with (La2-xSrx)CoO4/(La0.6Sr0.4)CoO3 composite polycrystals.