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- W3002110523 endingPage "1909254" @default.
- W3002110523 startingPage "1909254" @default.
- W3002110523 abstract "Pure ionic conductors as solid-state electrolytes are of high interest in electrochemical energy storage and conversion devices. They systematically involve only one ion as the charge carrier. The association of two mobile ionic species, one positively and the other negatively charged, in a specific network should strongly influence the total ion conduction. Nb5+- (4d0) and Ti4+-based (3d0) derived-perovskite frameworks containing Na+ and O2− as mobile species are investigated as mixed ion conductors by electrochemical impedance spectroscopy. The design of Na+ blocking layers via sandwiched pellet sintered by spark plasma sintering at high temperatures leads to quantified transport number of both ionic charge carriers tNa+ and tO2−. In the 350–700 °C temperature range, ionic conductivity can be tuned from major Na+ contribution (tNa+ = 88%) for NaNbO3 to pure O2− transport in NaNb0.9Ti0.1O2.95 phase. Such a Ti-substitution is accompanied with a ≈100-fold increase in the oxygen conductivity, approaching the best values for pure oxygen conductors in this temperature range. Besides the demonstration of tunable mixed ion conduction with quantifiable cationic and anionic contributions in a single solid-state structure, a strategy is established from structural analysis to develop other architectures with improved mixed ionic conductivity." @default.
- W3002110523 created "2020-01-30" @default.
- W3002110523 creator A5009136562 @default.
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- W3002110523 creator A5088339511 @default.
- W3002110523 date "2020-01-23" @default.
- W3002110523 modified "2023-10-14" @default.
- W3002110523 title "Associating and Tuning Sodium and Oxygen Mixed‐Ion Conduction in Niobium‐Based Perovskites" @default.
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