Publication date: 10th April 2024
Oxide ion conductors are an important class of materials with key technological applications for sensors and electrochemical energy systems. Current technology is based on Frenkel oxygen transport mechanisms in defective metal oxides, which require high activation energies ( > 0.8 eV) and, thus, high temperatures (> 600 °C). Here, we report the transport properties and electrochemical performances of superior hexagonal perovskite oxide, Ba7Nb4MoO20, as electrolyte bulk material in a symmetric electrode/electrolyte configuration with several electrodic materials. The oxygen transport mechanisms in Ba7Nb4MoO20 are interstitial, leading to fast ionic conduction at low temperatures with low activation energy. Our findings show that the material's ionic mechanisms are faster than previously reported and simulated. The electrode/electrolyte charge transfer mechanisms affect the overall conductivity, which depends on the electrode materials and We identify and giving a new set of enhanced ionic conduction ranges from 10-3 S/cm at 350 °C and leads to low activation energies at intermediate temperature.
We would like to acknowledge Independent Research Fund (Danmarks Frie Forskningsfon ) for supporting the project.
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