Impedance spectrum of a single grain boundary in yttrium stabilized zirconia

Dragoo, A. L.; Chiang, C. K.; Franklin, A.D.; Bethin, J.

doi:10.1016/0167-2738(82)90056-x

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…AC impedance studies on YSZ supported noble metal electrodes have been mostly focused on the bulk properties of YSZ [31][32][33][34] and on the reaction kinetics of the oxygen reduction in conjunction to their application as cathodes in SOFC [35][36][37][38][39][40][41][42][43]. AC impedance studies on Rh/ YSZ systems have been scarely carried out [44,45] and those under reaction conditions at electrochemically promoted electrodes are rare too [30,46].…”

Section: Ac Impedance Spectroscopy and Electrochemical Promotionmentioning

confidence: 99%

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

2011

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The electrochemical promotion of Rh/YSZ catalysts for C 2 H 4 oxidation was investigated together with the mechanism of electrochemical promotion via the use of AC impedance spectroscopy. The impedance response consists of two distinct semicircles and provides strong support for the sacrificial promoter mechanism of electrochemical promotion. The impedance analysis of the low frequency part of all spectra show the existence of a finite length Gerischer impedance which corresponds to the effective double layer formed by the spillover of promoting anionic oxygen from the YSZ support to the rhodium/gas interface and its slow consumption there by adsorbed hydrocarbon fragments. AC impedance analysis provides values both for the rate of consumption of the promoting spillover oxygen species as well as for the stability and capacitance the catalyst/gas double layer in various gaseous environments and temperatures.

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Section: Ac Impedance Spectroscopy and Electrochemical Promotionmentioning

confidence: 99%

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

2011

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“…During unloading, the lower-frequency arc becomes larger, whereas the higher-frequency arc remains almost unchanged. Below the stress of ~5 MPa, the higher-frequency arc almost cannot be separately observed because of the large lower-frequency arc as has been reported in earlier studies (3,5); however, in those studies, mainly/only a huge lower-frequency arc was observed due to a lack of a sufficient contact stress. The higher-frequency arc can be assigned to the bulk response (YSZ1 and YSZ2), whereas the lower-frequency arc to the interfacial resistance between the two single crystals.…”

Section: Resultsmentioning

confidence: 62%

“…For polycrystalline YSZ, the oxygen-ion transport property is attributed to the oxygen ion conductivities of bulk (grain) and grain boundary, and it has been generally known that oxygen-ion conductivity in bulk is superior to that in grain boundary (1,2). The oxygen-ion transport characteristics of the grain boundary in YSZ are normally extracted from the characteristics of polycrystalline samples, whereas it has been also evaluated using bicrystal or two single crystals in previous studies (3)(4)(5). Dragoo et al evaluated the characteristics of the grain boundary by using YSZ bicrystal consisting of two single crystals and a single grain boundary and observed a large resistance of the grain boundary (3).…”

Section: Introductionmentioning

confidence: 99%

“…The oxygen-ion transport characteristics of the grain boundary in YSZ are normally extracted from the characteristics of polycrystalline samples, whereas it has been also evaluated using bicrystal or two single crystals in previous studies (3)(4)(5). Dragoo et al evaluated the characteristics of the grain boundary by using YSZ bicrystal consisting of two single crystals and a single grain boundary and observed a large resistance of the grain boundary (3). Nakagawa et al confirmed a blocking effect of the grain boundary by measuring the oxygen-diffusion behavior of YSZ bicrystal (4).…”

Section: Introductionmentioning

confidence: 99%

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Oxygen-Ion Transfer between YSZ/YSZ and YSZ/LSCF under Mechanical Contact Stress

2013

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The present study concerns oxygen-ion transfer between yttriastabilized zirconia single crystals (YSZ/YSZ) under mechanical contact stress. Two YSZ single crystal plates were piled up between platinum meshes, and contact stress was mechanically applied. The interfacial conductivity as well as the bulk conductivity was successfully measured with this setup. The interfacial conductivity is greatly influenced by the contact stress, whereas the bulk conductivity is almost independent of the stress. The interfacial conductivity was significantly increased with increasing contact stress. A similar improvement in the interfacial conductivity between YSZ and lanthanum strontium cobalt ferrite (YSZ/LSCF) was also observed.

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“…A small but growing effort has been directed over the last several years to address this gap by pursuing direct observation and measurement of single grain boundaries. The main strategies are: 1) in-plane electrical measurements on polycrystalline materials using microcontact electrodes; [6][7][8][9][10][11][12] 2) preparation of macroscopic bicrystals that can be characterized using conventional electrical platforms; [13][14][15][16][17][18] 3) development of scanning probe microscopy and its derivatives. [19][20][21][22][23][24][25] Despite these efforts, a universal approach for the measurement of the transport characteristics of single grain boundaries remains elusive.…”

Section: Introductionmentioning

confidence: 99%

Local Multimodal Electro‐Chemical‐Structural Characterization of Solid‐Electrolyte Grain Boundaries

Carr

Chen

et al. 2021

Advanced Energy Materials

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Typical models of polycrystalline ionic materials treat the grain boundary properties as single valued, without consideration of the full range of values that define the macroscopically measured average. Here a unique experimental platform suitable for local multimodal characterization of individual grain boundaries in bicrystal fibers is reported. A variation of three orders of magnitude in the grain boundary conductivity of ceria is observed, as measured across six individual bicrystals by both alternating current impedance spectroscopy and direct current (D.C.) linear sweep voltammetry. Nonlinear behavior of the D.C. measurements is consistent with resistance due to a space charge effect. Time‐of‐flight secondary ion beam spectroscopy reveals a correlation between grain boundary resistance and the concentration of impurities Si, Al, and Ca segregated at the grain boundaries, although the bulk concentrations of these impurities are negligible. Electron backscatter diffraction analysis of the crystal orientations suggests a correlation between the misorientation across the grain boundaries and grain boundary resistance. These correlations point towards a grain boundary resistance that arises from impurity‐generated space charge effects and variations in impurity concentration and hence resistivity driven by the energetics of impurity segregation to grain boundaries of differing surface energies.

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Impedance spectrum of a single grain boundary in yttrium stabilized zirconia

Cited by 21 publications

References 11 publications

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

Study of the Mechanism of the Electrochemical Promotion of Rh/YSZ Catalysts for C2H4 Oxidation Via AC Impedance Spectroscopy

Oxygen-Ion Transfer between YSZ/YSZ and YSZ/LSCF under Mechanical Contact Stress

Local Multimodal Electro‐Chemical‐Structural Characterization of Solid‐Electrolyte Grain Boundaries

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