Diffusion of Oxygen at Ceramic Interfaces for High-Temperature Solid Oxide Fuel Cells

Teruhisa Horita; Haruo Kishimoto; Katsuhiko Yamaji; Natsuko Sakai; Yue Ping Xiong; Manuel E. Brito; Harumi Yokokawa

doi:10.4028/www.scientific.net/DDF.242-244.129

Paper Titles

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Elucidation of Ionic Conduction in Oxide Electrolytes by AC Method (Dielectric Relaxation Processes in La_1-xSr_xGa_1-x+0.1Ti_x-0.1O_3-δ)
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Diffusion of Oxygen at Ceramic Interfaces for High-Temperature Solid Oxide Fuel Cells
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Structural Defect Formation in Inorganic Sol-Gel Derived Oxides
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Cation Transport in Stabilised Zirconias
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Diffusion of Oxygen at Ceramic Interfaces for High-Temperature Solid Oxide Fuel Cells

Abstract:

Oxygen diffusion was measured at oxygen/cathode/electrolyte interfaces and at oxide scales/alloy interconnects in Solid Oxide Fuel Cells (SOFCs). A stable isotope oxygen exchange technique (16O/18O exchange) was adopted to label the diffusion profiles in the oxides, and secondary ion mass spectrometry (SIMS) depth profiles were examined to determine the diffusion coefficients in the oxide ceramic materials. Diffusivity of oxygen in LaMnO3 cathode was measured under polarized condition (that is, considering the electrochemical process and diffusion). Also, oxygen diffusion in the oxide scales formed on the alloy was measured to clarify the formation mechanism of oxide scale.