Direct Observation of Oxide Ion Conduction
Oxide ion conductors are key components in a number of technologically important applications, including solid oxide fuel cells (SOFCs), where they act as electrolytes transporting O2- to react with a fuel in the direct conversion of chemical to electrical energy. Better understanding of how the structures of such materials lead to high oxide ion conductivity will lead to more efficient fuel cells with lower operating temperatures. This would have significant technological and environmental impact. Using IN16b we have successfully investigated oxygen diffusion in La2Mo2O9 and have measured a QENS signal indicating oxygen dynamics in bismuth vanadate. In this proposal we request beam time on IN16b to complete our study of bismuth vanadate as well as investigate three new materials which are good candidates for intermediate temperature oxide ion conduction. IN16b is required to directly observe oxygen dynamics on the nanosecond timescales which are associated with long range diffusion and can be confronted with macroscopic, conductivity measurements. Ab initio molecular dynamics simulations are being performed on these materials to give detailed insight into diffusion mechanisms.
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Joseph R. Peet; EVANS Ivana; Bernhard Frick; JOHNSON Mark Robert and SEYDEL Tilo. (2016). Direct Observation of Oxide Ion Conduction. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-03-151
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