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D. Chen, S. Bishop, and H. L. Tuller, Advanced Functional Materials , online, 2012

Non-stoichiometry of N anoscaled Oxide Thin Films Harry L. Tuller, Massachusetts Institute of Technology, DMR 0908627.

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D. Chen, S. Bishop, and H. L. Tuller, Advanced Functional Materials , online, 2012

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  1. Non-stoichiometry of Nanoscaled Oxide Thin Films Harry L. Tuller, Massachusetts Institute of Technology, DMR 0908627 • Background: While the properties of functional oxide thin films (fuel cell electrodes, sensors, memristors) depend strongly on oxygen stoichio- metry, there have been few ways to extract this information reliably and in-situ. • Experimental results:The oxygen non-stoichiometry of dense Pr0.1Ce0.9O2-δ thin films was derived from an analysis of chemical capacitance obtained by impedance spectroscopy enabling extraction of thermodynamic constants defining defect generation. • Impact: Demonstrated ability to measure oxygen non-stoichiometry of thin oxide films with high sensitivity and resolution. Allowed for investigation of nano-dimensions on defect generation Non-stoichiometry of thin film and bulk PCO derived from Cchem (filled symbols) and TGA (empty symbols), respectively with solid and dashed lines representing non-stoichiometry for thin films and bulk, respectively, calculated from the defect model. D. Chen, S. Bishop, and H. L. Tuller, Advanced Functional Materials, online, 2012

  2. Novel Cathode for Solid Oxide Fuel Cells (SOFCs)Harry L. Tuller, Massachusetts Institute of Technology, DMR 0908627 • Background: The cathodein Solid Oxide Fuel Cells (SOFC), at which oxygen is incorporated into the solid electrolyte, presently limits efficient operation at reduced temperatures. Besides rapid oxygen reduction kin- etics, chemical and thermo-mechan- ical stability are essential. • Results: Praseodymium doped cerium oxide (PCO), a fluorite structured oxide, compatible with the best fluorite electrolyte (Gd doped ceria) was found to display surface exchange kinetics comparable to other highly regarded cathode materials. • Impact: PCO is demonstrated to be a potential SOFC cathode material with enhanced compatibility. Temperature dependence of RS (area specific resistance) of PCO compared with other dense thin-film electrodes. D. Chen, S. R. Bishop, and H. L. Tuller, Journal of Electroceramics, 28, 62, 2012.

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