Impact of the local distortions on proton transfer in triple conducting materials for high temperature electrochemical devices.
La0.9Sr0.1ScO3-d (LSS) perovskites are promising electrolyte materials for various electrochemical devices such as gas sensors, hydrogen pumps, membrane reactors and protonic-ceramic fuel cells. By doping LSS with transition metals (Me) of variable valance into the Sc sublattice, we create perovskites of the composition La0.9Sr0.1Sc1-xMexO3-d. These triple conducting materials, capable to conduct protons, oxygen ions and electronic holes, are perfect candidates for electrode materials and hydrogen separation membranes. However, there is no understanding yet available of the impact of transition metals onto structural distortions, changes in the proton sites and dynamics. With this proposal, we want to perform neutron pair distribution function (PDF) measurements on Cobalt-doped LSS, due to its superiority of total conductivity at high oxygen partial pressures. Experiments on dried, hydrated and deuterated samples of three different Co concentrations (x = 0, 0.05 and 0.1) will allow us understand the influence of transition metals on local distortions, proton positions and dynamics in perovskite-like oxide systems.
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M. Plekhanov; CUELLO Gabriel; Henry E. Fischer; PRINZ Nils; THOMAE Sabrina and Mirijam Zobel. (2020). Impact of the local distortions on proton transfer in triple conducting materials for high temperature electrochemical devices.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-06-490
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