Different conduction behaviors of grain boundaries in SiO2-containing 8YSZ and CGO20 electrolytes

Zhang, T.S.; Ma, Jan; Chen, Y.Z.; Luo, Linghong; Kong, Ling Bing; Chan, Siew Hwa

doi:10.1016/j.ssi.2006.05.006

Cited by 60 publications

(33 citation statements)

References 25 publications

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“…Recently, Guo and Waser [37] gave a comprehensive interpretation on effect of grain boundary based on space-charge model and Schottky barrier model, and pointed out that there were intrinsic and extrinsic source of the grain boundary blocking effect with regard to ionic transport. In contrast, Zhang et al [35] observed that the grain boundary conductivities for micronsized YSZ and GDC samples with moderate SiO 2 impurity level were rather than that of grain interior, suggesting the existence of "clean" grain contact resulting from decreased grain boundary coverage of thin silica film could serve as fast ion transport path. The large discrepancy between experimental reports and theoretical viewpoints so far reflects the character of grain boundary conduction may depend upon the solid solution system, purity and preparation method of the precursor powders as well as thermal treatment of For low-temperature application there is a tendency for grain boundary to exert a greater influence on the total conductivity.…”

Section: Electrical Behavior For Grain Boundarymentioning

confidence: 88%

“…The dispute over the role of grain boundary on the ionic conductivity of ceramics has lasted over decades [13,[32][33][34][35][36], and this often led to contradiction and confusion on the interpretation of specific research findings in this field. Early study performed by Tien [13] on Ca-doped ZrO 2 has attributed the high-ionic conductivity for sample with smaller grain size to the relatively low grain boundary resistance compared with that of bulk grains, which was regarded to intrinsically coming from the enhanced ionic diffusion at the grain interface due to high defect concentration and disordered grain boundary structure.…”

Section: Electrical Behavior For Grain Boundarymentioning

confidence: 99%

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Electrical properties of samaria-doped ceria electrolytes from highly active powders

Ding

Liu

Gong

et al. 2010

Electrochimica Acta

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Section: Electrical Behavior For Grain Boundarymentioning

confidence: 88%

Section: Electrical Behavior For Grain Boundarymentioning

confidence: 99%

Electrical properties of samaria-doped ceria electrolytes from highly active powders

Ding

Liu

Gong

et al. 2010

Electrochimica Acta

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“…The impedance spectrum of an ionic conductor contains contributions from the grain interior (the first arc), the grain boundary (the second arcs), and the electrode-electrolyte interface, which can be simplified by three arcs. Depending on the nature of the sample and conditions of the experiment, all of these arcs cannot be observed [13,14]. The complex impedance spectra plots, which were constructed for operating temperatures of 300…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Samaria-Doped Ceria Prepared by Pechini Method

Arabacı

Serin

2015

Acta Phys. Pol. A

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CeO2 ceramics doped with 20 mol.% samarium were prepared through the Pechini process. The samples were calcined at 400, 700 and 1000• C. The sintering behavior of the calcined SDC-20 powders was also investigated at 1400• C for 6 h. Microstructural and physical properties of SDC-20 samples were characterized with X-ray diffraction, scanning electron microscopy, thermogravimetry and impedance analysis methods. The results of the thermogravimetry/differential thermal analysis and X-ray diffraction indicated that a single-phase fluorite structure formed at a relatively low calcination temperature of 400• C. It is understood from the measured ionic conductivity values that the pellet formed from the SDC-20 samples calcined at 1000• C had lower resistance of grain-boundary than those of the pellets formed from the SDC-20 samples calcined at 400 and 700• C. The maximum ionic conductivity was measured as 1.95 × 10 −2 S cm −1 at 800

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“…Highly resistive impurities commonly segregate in the grain boundary regions, leading to transport limitations. In the solid electrolyte materials such as doped zirconia and ceria, silica and alumina are the most common impurities detected along with the grain boundaries; these components are often introduced during the preparation and calcination steps [105][106][107][108][109].…”

Section: Microstructural Phenomena In Perovskite-type Membranesmentioning

confidence: 99%

Interfacial Phenomena in Mixed Conducting Membranes: Surface Oxygen Exchange‐ and Microstructure‐Related Factors

Zhu

Yang

2011

Solid State Electrochemistry II

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The transport behavior of ions, such as O 2À anions or protons, driven by chemical potential gradient across dense mixed conducting membranes is governed by many factors. In this chapter, the effects of surface exchange and ceramic microstructure are addressed. The surface-related aspects are discussed involving selected theoretical approaches and modeling. Relevant experimental methods are briefly described. The influence of microstructure on the gas permeation processes is analyzed for several types of mixed conducting membranes. The relationships between the membranes stability and their microstructure and surface exchange kinetics are considered on the basis of existing experimental data. IntroductionSolid-state nonmetallic conducting materials have been extensively developed and applied for various solid electrochemical devices during the last century. A large number of works reveal the great interest of researchers in energy storage and conversion devices, sensors, gas separation membranes, and other electrochemical applications of solid-state conducting materials [1-3]. The charge carriers may include electrons (or holes), protons, nonmetallic anions (such as O 2À , Cl À , etc.), and metal cations (such as Li þ , Na þ , etc.). The major groups of ion-conducting materials are discussed in the first volume of this handbook. Mixed conductors are the materials that have more than one type of mobile charge carriers (see Chapter 3 of the first volume). The high-temperature electrochemical applications of mixed conductors are, in particular, electrodes for solid oxide fuel cells (SOFCs) and other electrochemical devices, and ceramic membranes for oxygen, hydrogen, and carbon dioxide separation. For these types of applications, the solid should have high values of both the ionic/protonic and electronic conductivities. The electrode applications have been reviewed by many researchers [4][5][6][7], including Chapter 12 of the first volume and Chapters 5, 6 and 9 of this book, and are thus outside the scope of this chapter focused on selected aspects of mixed conducting membranes for gas separation.Solid State Electrochemistry II: Electrodes, Interfaces and Ceramic Membranes. Edited by Vladislav V. Kharton.

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Different conduction behaviors of grain boundaries in SiO2-containing 8YSZ and CGO20 electrolytes

Cited by 60 publications

References 25 publications

Electrical properties of samaria-doped ceria electrolytes from highly active powders

Electrical properties of samaria-doped ceria electrolytes from highly active powders

Characteristics of Samaria-Doped Ceria Prepared by Pechini Method

Interfacial Phenomena in Mixed Conducting Membranes: Surface Oxygen Exchange‐ and Microstructure‐Related Factors

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