Unraveling the defect chemistry and proton uptake of yttrium-doped barium zirconate
نویسندگان
چکیده
A review of the experimental literature documenting water uptake in yttrium-doped barium zirconate in combination with new results obtained here show that much of the observed scatter can be explained in terms of barium deficiency, which furthermore induces a lowering in cell volume. In addition, through a comparison of weight changes under regular and heavy water vapor pressure, strong evidence is found for bulk oxidation of the oxide by water simultaneous with hydration. 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
منابع مشابه
Proton trapping in yttrium-doped barium zirconate.
The environmental benefits of fuel cells have been increasingly appreciated in recent years. Among candidate electrolytes for solid-oxide fuel cells, yttrium-doped barium zirconate has garnered attention because of its high proton conductivity, particularly in the intermediate-temperature region targeted for cost-effective solid-oxide fuel cell operation, and its excellent chemical stability. H...
متن کاملStability and Electric Conductivity of Barium Cerate Perovskites Co-Doped with Praseodymium
Co-doping of yttrium doped mixed barium cerate/zirconate perovskite (BCZY) with small amounts of Pr (BCZYP) substantially increases electrical conductivity while retaining structural and chemical stability. BCZYP is predominantly a proton conductor at temperatures up to 600-650 ̊C, whereas it is a mixed proton/oxide ion/electron conductor at higher temperatures. The co-doped BCZYP perovskite can...
متن کاملAtomic Resolution Distortion Analysis of Yttrium-Doped Barium Zirconate
Ionic transport dynamics underpins the functionality of most energy storage and conversion technologies. Yttrium-doped barium zirconate (Y-BZO) has attracted attention as a promising electrolyte for proton-conducting solid oxide fuel cells (PC-SOFCs), which stems from its high proton conductivity and excellent chemical stability at intermediate temperatures (400-700°C) [1]. The Grotthuss mechan...
متن کاملDemonstrating the potential of yttrium-doped barium zirconate electrolyte for high-performance fuel cells
In reducing the high operating temperatures (≥800 °C) of solid-oxide fuel cells, use of protonic ceramics as an alternative electrolyte material is attractive due to their high conductivity and low activation energy in a low-temperature regime (≤600 °C). Among many protonic ceramics, yttrium-doped barium zirconate has attracted attention due to its excellent chemical stability, which is the mai...
متن کاملCation non-stoichiometry in yttrium-doped barium zirconate: phase behavior, microstructure, and proton conductivity
Recent literature indicates that cation non-stoichiometry in proton-conducting perovskite oxides (ABO3) can strongly influence their transport properties. Here we have investigated A-site nonstoichiometry in Ba1 xZr0.8Y0.2O3 d, a candidate electrolyte material for fuel cell and other electrochemical applications. Synthesis is performed using a chemical solution approach in which the barium defi...
متن کامل