Layered Perovskites BaM 2 In 2 O 7 (M = La, Nd): From the Structure to the Ionic (O 2- , H + ) Conductivity

• Published in: Materials Vol. 15; no. 10
• Main Authors: Tarasova, Nataliia, Galisheva, Anzhelika, Animitsa, Irina, Belova, Ksenia, Egorova, Anastasia, Abakumova, Ekaterina, Medvedev, Dmitry
• Format: Journal Article
• Language: English
• Published: Switzerland 12.05.2022
• Subjects: layered perovskite; protonic conductivity; BaNd2In2O7; BaLa2In2O7; water uptake; Ruddlesden–Popper structure; oxygen-ion conductivity
• ISSN: 1996-1944; 1996-1944

The design of new oxide compounds that can be used as oxygen- or proton-conducting electrolytes for solid oxide fuel cells is actively in progress. Despite the intensive research activities regarding electrolytes with perovskite/fluorite structures, the search for other structural alternatives is of paramount importance. In this study we focus on a novel material with significantly improved properties for the electrochemical purposes. The two-layered BaNd In O perovskite with a Ruddlesden-Popper structure was investigated as a protonic conductor for the first time. In detail, its local structure, water uptake, and the ionic (O , H ) conductivity were comprehensively studied. The nature of rare-earth elements (M = La, Nd) in the structure of BaM In O on the structural and transport properties was revealed. The presented analysis showed that the composition of BaNd In O is nearly pure proton conductor below 350 °C. This work opens up a new way in the design of protonic conductors with double-layered perovskite structure.