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Materials 2017, 10(4), 368; doi:10.3390/ma10040368

Controlling Oxygen Mobility in Ruddlesden–Popper Oxides

Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Author to whom correspondence should be addressed.
Academic Editor: Christian Jooss
Received: 1 March 2017 / Revised: 27 March 2017 / Accepted: 28 March 2017 / Published: 31 March 2017
(This article belongs to the Special Issue (Photo)Electrochemistry of Perovskites)
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Abstract

Discovering new energy materials is a key step toward satisfying the needs for next-generation energy conversion and storage devices. Among the various types of oxides, Ruddlesden–Popper (RP) oxides (A2BO4) are promising candidates for electrochemical energy devices, such as solid oxide fuel cells, owing to their attractive physicochemical properties, including the anisotropic nature of oxygen migration and controllable stoichiometry from oxygen excess to oxygen deficiency. Thus, understanding and controlling the kinetics of oxygen transport are essential for designing optimized materials to use in electrochemical energy devices. In this review, we first discuss the basic mechanisms of oxygen migration in RP oxides depending on oxygen nonstoichiometry. We then focus on the effect of changes in the defect concentration, crystallographic orientation, and strain on the oxygen migration in RP oxides. We also briefly review their thermal and chemical stability. Finally, we conclude with a perspective on potential research directions for future investigation to facilitate controlling oxygen ion migration in RP oxides. View Full-Text
Keywords: ruddlesden-popper oxides; perovskite oxides; layered perovskite oxides; mixed ionic and electronic conductors; oxygen ion migration; oxygen diffusion; anisotropy; solid oxide fuel cells; thermal expansion coefficients; chemical expansion ruddlesden-popper oxides; perovskite oxides; layered perovskite oxides; mixed ionic and electronic conductors; oxygen ion migration; oxygen diffusion; anisotropy; solid oxide fuel cells; thermal expansion coefficients; chemical expansion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, D.; Lee, H.N. Controlling Oxygen Mobility in Ruddlesden–Popper Oxides. Materials 2017, 10, 368.

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