Novel proton-conducting layered perovskite based on BaLaInO4 with two different cations in B-sublattice: Synthesis, hydration, ionic (O2−, H+) conductivity

• Published in: International journal of hydrogen energy 2022-05, Vol.47 (44), p.18972-18982
• Main Authors: Tarasova, N., Galisheva, A., Animitsa, I., Korona, D., Davletbaev, K.
• Format: Article
• Language: English
• Subjects: BaLaIn0·5Y0·5O4; BaLaInO4; Oxygen-ion conductivity; Protonic conductivity; Ruddlesden-popper structure; Water uptake
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.04.112

The present study focused on the novel material with significantly improved properties for the application in the area of clean energy. The new complex oxide BaLaIn0·5Y0·5O4 with layered perovskite structure was obtained for the first time. It was proved that the introduction of Y3+ ions in the perovskite layer of BaLaInO4 leads i) to the rise of the oxygen-ionic conductivity due to the increase in mobility of oxygen ions as a result of the expand of the cell volume and ii) to the enhancement of protonic conductivity due to the increase in the proton concentration and mobility. The sample BaLaIn0·5Y0·5O4 is nearly pure proton conductor below 400 °C and has the protonic conductivity value 1.6∙10−5 S/cm at this temperature. [Display omitted] •Isovalent Y/In doping leads to increase in the protonic conductivity of BaLaInO4.•The doping increases both concentration and mobility of protons.•Isovalent doping is a promising method for improving of protonic transport in layered perovskites.