Oxygen defects and diffusion pathways in n=2,3 Ruddlesden-Popper phases for solid oxide water electrolysis application
The perovskite-derived Ruddlesden-Popper (RP) series Lnn+1NinO3n+1ąż (Ln = La, Nd, Pr), are considered as oxygen electrode materials of substantial interest for solid oxide fuel and electrolysis cell application. The oxygen transport properties and performances of the materials are highly dependent on the oxygen stoichiometry, the degree of octahedral tilting and the anionic interstitial site occupancy. Although these structure-properties relationships have been established in details for perovskite and n=1 RP phases, they remain to be unraveled for higher n members of the RP series. We wish to tackle this problematic through a high-resolution powder neutron diffraction study at room temperature and at temperatures close to the operating conditions of devices, where oxygen starts to diffuse, on n=2 La3Ni2O7ąż, and n=3 Pr4Ni3O10ąż. Rietveld refinements will allow to get accurate information on the position, occupancy and displacement parameters of the multiple oxygen sites at high T. Visualization of diffusion pathways will be attempted by the reconstruction of the nuclear density using the Maximum Entropy Method (MEM), an analysis that has yet never been done on n=2,3 RP members.
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Jacinthe Gamon; BASSAT Jean Marc; DEMOURGUES Alain; FRUGIER Romuald; HERNANDEZ Olivier and RITTER Clemens. (2023). Oxygen defects and diffusion pathways in n=2,3 Ruddlesden-Popper phases for solid oxide water electrolysis application. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-22-810
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