Abstract
This work focused on the novel electrochemical energy material with significantly improved electrical properties. The novel complex oxide Ba1.1La0.9In0.5Y0.5O3.95 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 Ba1.1La0.9In0.5Y0.5O3.95 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.
Highlights
The proton-conducting solid oxides were revealed for the first time at the early 1980s
The method of simultaneous hetero- and isovalent doping for the purpose of improving the transport properties of layered perovskites was investigated
The co-doped complex oxide Ba1.1La0.9In0.5Y0.5O3.95 was prepared for the first time
Summary
The proton-conducting solid oxides were revealed for the first time at the early 1980s. After variously doped barium cerates and zirconates [8,9,10], classes of proton-conducting materials like hexagonal [11,12,13,14,15,16,17], oxygen-deficient [18,19,20], block-layered [21,22,23,24,25,26,27,28,29,30,31] perovskites, brownmillerites [32,33,34], pyrochlores [35,36,37,38], apatites [39], monazites [40,41,42], gallium-based oxides [43,44,45], materials with fluorite- [46,47,48], fergusonite- [49,50,51], and weberite-types [52,53] of structures were described.
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