Transport properties of Ba(Zr0.8Y0.2)O3−δ perovskite

Nomura, Katsuhiro; Kageyama, Hiroyuki

doi:10.1016/j.ssi.2007.02.010

Cited by 153 publications

(103 citation statements)

References 13 publications

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“…As observed for the measurements in the wet environment (Fig. 2d), the conductivity values measured in dry Ar and dry O 2 are also about two orders of magnitude larger than the conductivity values measured in the same environments for BZY sintered pellets 43 . Figure 4b and c show the complex impedance-plane plots for the BZY film deposited on MgO measured at 500…”

Section: R Educing the Sofc Operating Temperature In The Intermediatesupporting

confidence: 63%

High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition

et al. 2010

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Reducing the operating temperature in the 500-750 • C, is one of the major targets in present SOFC research 1,2 , and it is also a requisite for the development of miniaturized SOFCs for portable power supply 3,4 . Improving the electrolyte performance for intermediate-temperature operation can be achieved by reducing the electrolyte thickness 5,6 , and by using alternative materials to yttria-stabilized zirconia with a larger ionic conductivity in the intermediate temperature range 7 . With respect to the oxygen-ion conductors conventionally used in SOFCs, electrolytes based on high-temperature proton conductors (HTPCs) take advantage of their lower activation energy for charge transport 8 and of water formation at the cathode side 9,10 , thereby resulting in suitable conductivity in the intermediate temperature range and avoiding fuel dilution with water.Among HTPCs, Y-doped barium cerate (BCY) electrolytes have shown rather high protonic conductivity (10 −2 S cm −1 at 600 • C; ref. 11), although BCY strongly reacts with CO 2 (ref. 12) and water vapour 13 , hindering technological applications. On the other hand, despite a very good chemical stability of Y-doped barium zirconate (BZY) under fuel-cell operating environments, the total proton conductivity of BZY sintered pellets is generally significantly lower (about 10 −3 S cm −1 at 600 ; refs 14,15). This is due to the poor sinterability of BZY (ref. 16), together with the poor conducting properties of BZY grain boundary regions 17 . Scattered conductivity values for BZY samples are reported in the literature, and mostly depend on the processing parameters (see Supplementary Fig. S1).However, about a decade ago electrochemical impedance spectroscopy (EIS) measurements at temperatures below 200• C, that is, in the temperature range where impedance spectra allowed separation of the bulk and the grain boundary contribution,

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Section: R Educing the Sofc Operating Temperature In The Intermediatesupporting

confidence: 63%

High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition

et al. 2010

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“…(S6) and the following for completeness 2 . However, because holes are only important at relatively high temperatures 16 (higher than those explored in the present work), these defects have little impact and are largely treated as negligible. Conservation of proton and yttrium species in the system imply, respectively,…”

Section: S13-1 Defect Chemistry Of Proton-dopant Associationmentioning

confidence: 80%

Proton trapping in yttrium-doped barium zirconate

et al. 2013

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“…However, at high temperatures the behavior deviates substantially from linearity, displaying a strongly change in slope, at approximately 450 °C [53,54] . This behavior may be related to certain physical-chemistry phenomena, such as the temperature dependences of the entropies and enthalpies of water incorporation, beyond the influences of hole and oxygen concentrations at high temperatures seem to be more eligible 38,[55][56][57] . Thereby, as a consequence of a physical artifact, ΔH H 2 O and ΔS H 2 O extracted from the curve may present inconsistent values in a wide temperature range.…”

Section: Incorporation and Proton Transport Mechanismsmentioning

confidence: 99%

Properties and applications of perovskite proton conductors

2010

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A brief overview is given of the main types and principles of solid-state proton conductors with perovskite structure. Their properties are summarized in terms of the defect chemistry, proton transport and chemical stability. A good understanding of these subjects allows the manufacturing of compounds with the desired electrical properties, for application in renewable and sustainable energy devices. A few trends and highlights of the scientific advances are given for some classes of protonic conductors. Recent results and future prospect about these compounds are also evaluated. The high proton conductivity of barium cerate and zirconate based electrolytes lately reported in the literature has taken these compounds to a highlight position among the most studied conductor ceramic materials.

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Transport properties of Ba(Zr0.8Y0.2)O3−δ perovskite

Cited by 153 publications

References 13 publications

High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition

High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition

Proton trapping in yttrium-doped barium zirconate

Properties and applications of perovskite proton conductors

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