Thermoelectric behavior of BaZr0.9Y0.1O3−d proton conducting electrolyte
| Autor: | Dmitry Malyshkin, Vladimir V. Sereda, Dmitry S. Tsvetkov, Andrey Yu. Zuev, I.L. Ivanov |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
PROTON CONDUCTORS
Materials science PROTON CONDUCTOR BaZr0.9Y0.1O2.95 seebeck coefficient Filtration and Separation 02 engineering and technology Activation energy Conductivity 010402 general chemistry Polaron lcsh:Chemical technology 01 natural sciences OXYGEN THERMOELECTRICITY SEEBECK COEFFICIENT BARIUM COMPOUNDS Seebeck coefficient Thermoelectric effect Chemical Engineering (miscellaneous) lcsh:TP1-1185 PROTON-CONDUCTING ELECTROLYTE lcsh:Chemical engineering BAZR0.9Y0.1O2.95 COMBINED MEASUREMENTS CONDUCTIVITY Proton conductor Condensed matter physics ELECTROLYTES Process Chemistry and Technology HYDRATION lcsh:TP155-156 OXIDATIVE CONDITIONS ACTIVATION ENERGY DEFECTS 021001 nanoscience & nanotechnology Thermal conduction TRANSFERENCE NUMBER PROTON CONDUCTING MATERIALS 0104 chemical sciences ELECTRICAL CONDUCTIVITY ELECTRIC CONDUCTIVITY Charge carrier conductivity ZIRCONIUM COMPOUNDS 0210 nano-technology proton conductor hydration |
| Zdroj: | Membranes Membranes, Vol 9, Iss 9, p 120 (2019) Volume 9 Issue 9 |
| Popis: | BaZr0.9Y0.1O3-&delta (BZY10), a promising proton conducting material, exhibits p-type conduction under oxidative conditions. Holes in BZY10 are of the small polaron type. However, there is no clear understanding at which places in the lattice they are localized. The main objectives of this work were, therefore, to discuss the nature of electronic defects in BZY10 on the basis of the combined measurements of the thermo-EMF and conductivity. Total electrical conductivity and Seebeck coefficient of BZY10 were simultaneously studied depending on partial pressures of oxygen (pO2), water (pH2O) and temperature (T). The model equation for total conductivity and Seebeck coefficient derived on the basis of the proposed defect chemical approach was successfully fitted to the experimental data. Transference numbers of all the charge carriers in BZY10 were calculated. The heat of transport of oxide ions was found to be about one half the activation energy of their mobility, while that of protons was almost equal to the activation energy of their mobility. The results of the Seebeck coefficient modeling indicate that cation impurities, rather than oxygen sites, should be considered as a place of hole localization. |
| Databáze: | OpenAIRE |
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