Simultaneous Hetero- and Isovalent Doping as the Strategy for Improving Transport Properties of Proton Conductors Based on BaLaInO4

Nataliia Tarasova; Anzhelika Galisheva; Irina Animitsa; Ksenia Belova

doi:10.3390/ma14216240

Simultaneous Hetero- and Isovalent Doping as the Strategy for Improving Transport Properties of Proton Conductors Based on BaLaInO₄

Materials (Basel). 2021 Oct 20;14(21):6240. doi: 10.3390/ma14216240.

Authors

Nataliia Tarasova¹, Anzhelika Galisheva¹, Irina Animitsa¹, Ksenia Belova¹

Affiliation

¹ The Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, 620066 Ekaterinburg, Russia.

Abstract

This work focused on the novel electrochemical energy material with significantly improved electrical properties. The novel complex oxide Ba_1.1La_0.9In_0.5Y_0.5O_3.95 with layered perovskite structure was obtained for the first time. It was proven that the simultaneous introduction of barium and yttrium ions in the structure of BaLaInO₄ leads to the increase in the unit cell volume of up to 4% and water uptake by about three times. The increase in the proton conductivity values was both due to an increase in the proton concentration and their mobility. The sample Ba_1.1La_0.9In_0.5Y_0.5O_3.95 was a nearly pure proton conductor below 400 °C. The co-doping strategy allowed us to increase the protonic conductivity values up to two orders of magnitude and it is the successful method for the design of novel protonic conductors based on the layered perovskites.

Keywords: BaLaInO4; Ruddlesden-Popper structure; layered perovskite; oxygen-ion conductivity; protonic conductivity; water uptake.