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Open AccessArticle

Thermoelectric Behavior of BaZr0.9Y0.1O3−d Proton Conducting Electrolyte

1
Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
2
Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg 620000, Russia
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(9), 120; https://doi.org/10.3390/membranes9090120
Received: 13 August 2019 / Revised: 4 September 2019 / Accepted: 11 September 2019 / Published: 13 September 2019
(This article belongs to the Special Issue Ceramic Membranes for Fuel Cell Applications and Hydrogen Production )
BaZr0.9Y0.1O3-δ (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. View Full-Text
Keywords: proton conductor; BaZr0.9Y0.1O2.95; seebeck coefficient; conductivity; hydration proton conductor; BaZr0.9Y0.1O2.95; seebeck coefficient; conductivity; hydration
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MDPI and ACS Style

Tsvetkov, D.; Ivanov, I.; Malyshkin, D.; Sereda, V.; Zuev, A. Thermoelectric Behavior of BaZr0.9Y0.1O3−d Proton Conducting Electrolyte. Membranes 2019, 9, 120.

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