Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

摘要

Ionic conducting materials are crucial for the function of many advanced devices used in a variety of applications, such as fuel cells and gas separation membranes. Many different chemical controls, such as aliovalent doping, have been attempted to stabilize delta-Bi2O3, a material with exceptionally high oxide-ion conductivity which is unfortunately only stable over a narrow temperature range. In this study, we employ a multinuclear, variable-temperature NMR (VT-NMR) spectroscopy approach to characterize and measure oxide-ionic motion in the V- and P-substituted bismuth oxide materials Bi0.913V0.087O1.587, Bi0.852V0.148O1.648, and Bi0.852P0.148O1.648, previously shown to have excellent ionic conduction properties (Kuang et al., Chem. Mater. 2012, 24, 2162; Kuang et al., Angew. Chem., Int. Ed. 2012, 51, 690). Two main O-17 NMR resonances are distinguished for each material, corresponding to O in the Bi-O and V-O/P-O sublattices. Using VT measurements ranging from room temperature to 923 K, the ionic motion experienced by these different sites has then been characterized, with coalescence of the two environments in the V-substituted materials clearly indicating a conduction mechanism facilitated by exchange between the two sublattices. The lack of this coalescence in the P-substituted material indicates a different mechanism, confirmed by O-17 T-1 (spin-lattice relaxation) NMR experiments to be driven purely by vacancy motion in the Bi-O sublattice. V-51 and P-31 VT-NMR experiments show high rates of tetrahedral rotation even at room temperature, increasing with heating. An additional VO4 environment appears in O-17 and V-51 NMR spectra of the more highly V-substituted Bi0.852V0.148O1.648, which we ascribe to differently distorted VO4 tetrahedral units that disrupt the overall ionic motion, consistent both with line width analysis of the O-17 VT-NMR spectra and experimental results of Kuang et al., showing a lower oxide-ionic conductivity in this material compared to Bi0.913V0.087O1.587 (Chem. Mater. 2012, 24, 2162). This study shows that solid-state NMR is particularly well suited to understanding connections between local structural features and ionic mobility and can quantify the evolution of oxide-ion dynamics with increasing temperature.