Stability of Sc2O3 and CeO2 co-doped ZrO2 Electrolyte during the Operation of Solid Oxide Fuel Cells

Shimazu, Megumi; Isobe, Toshihiro; Ando, Shigeru; Hiwatashi, Kenichi; Ueno, Akira; Yamaji, Katsuhiko; Kishimoto, Haruo; Yokokawa, Harumi; Nakajima, Akira; Okada, Kiyoshi

doi:10.1016/j.ssi.2010.08.030

Cited by 29 publications

(32 citation statements)

References 30 publications

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“…This suggests that true issues should be first extracted from stack behaviors. In other words, button cell experiments are contaminated or interfered with those materials which are not used in stacks/systems, such as laboratory‐use sealants, Pt and similar materials . Even so, it becomes essential to reproduce those extracted issues even in a single/button cell level as early as possible; a most difficult case was the deterioration of cathode (LSM)‐supported YSZ electrolyte facing to anode atmosphere . Eventually, attempts were succeeded in reproducing pulverization of Mn‐doped YSZ under a steep oxygen potential gradient by using thinner YSZ, and results revealed what are most important factors of controlling this phenomenon .…”

Section: Introductionmentioning

confidence: 90%

Achievements of NEDO Durability Projects on SOFC Stacks in the Light of Physicochemical Mechanisms

et al. 2019

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Achievements of NEDO durability projects on SOFC mode are summarized with a focus on the physicochemical mechanisms characterized by diffusion properties of cell components and chemical reactions of cell components with gaseous impurities. Ni sintering and depletion including impurity (P, B, S) effects have been examined in terms of the surface/interface energies of Ni/oxide cermet anodes. The conductivity degradation due to the transformation of the cubic YSZ electrolyte was found to be characterized in terms of two time constants for the reductive and the oxidative regions to be determined by the Y‐diffusivity and its enhancement on NiO internal reduction in YSZ, while observed gaps in conductivity degradation behavior between stacks and button cells were ascribed to differences in those physicochemical properties involved, namely cation diffusion and kinetics associated with NiO internal reduction. The cathode performance degradation due to sulfur poisoning exhibits a variety of dependences on the microstructure (dense or porous) of doped‐ceria interlayers, the thickness of YSZ electrolyte and the humidity in the anode atmosphere, suggesting effects of protons in the cathode vicinity and the SrO activity changes during fabrication the LSCF/GDC/YSZ multilayers. Some defect chemical considerations were made on how such defects are affected by fabrication processes.

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Section: Introductionmentioning

confidence: 90%

Achievements of NEDO Durability Projects on SOFC Stacks in the Light of Physicochemical Mechanisms

et al. 2019

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“…Raman is uniquely sensitive to material properties such as phase, oxidation state, doping levels, and crystallite size which are strongly related to important physical properties such as conductivity and mechanical strength. Aging and phase separation effects within yttria stabilized zirconia (YSZ) SOFC electrolytes have been studied extensively as a function of doping during sintering and annealing [31] as well as post operation [12]. Figure 2(a) shows the Raman response of the cubic, tetragonal and monocline forms of ZrO 2 which have been induced through doping [21].…”

Section: Ex Situ Raman Spectroscopymentioning

confidence: 99%

“…Component materials have been characterized for phase separation, doping levels, stability, and other properties before being utilized within systems [11][12][13]. In this paper we give a summary of the technique itself and highlight ex situ and in situ studies that are particularly relevant for SOFCs.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy of Solid Oxide Fuel Cells: Technique Overview and Application to Carbon Deposition Analysis

et al. 2013

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Raman spectroscopy is a powerful characterization tool for improving the understanding of solid oxide fuel cells (SOFCs), capable of providing direct, molecularly specific information regarding the physical and chemical processes occurring within functional SOFCs in real time. In this paper we give a summary of the technique itself and highlight ex situ and in situ studies that are particularly relevant for SOFCs. This is followed by a case study of carbon formation on SOFC Ni‐based anodes exposed to carbon monoxide (CO) using both ex situ and in situ Raman spectroscopy combined with computational simulations. In situ measurements clearly show that carbon formation is significantly reduced for polarized SOFCs compared to those held at open circuit potential (OCP). Ex situ Raman mapping of the surfaces showed clear variations in the rate of carbon formation across the surface of polarized anodes. Computational simulations describing the geometry of the cell showed that this is due to variations in gas access. These results demonstrate the ability of Raman spectroscopy in combination with traditional characterization tools, to provide detailed understanding of critical processes occurring within functional SOFCs.

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“…However, it was found that the cubic phase transforms on the surface of the solid electrolyte to monoclinic via tetragonal phase during operation at 900ºC of a tubular-type SOFC [13]. Conductivity degradation of this electrolyte was also observed at 600ºC during long-term operation in humidified mixture of H 2 /N 2 and humidified H 2 [14].…”

Section: Introductionmentioning

confidence: 96%

Influence of additives on phase stabilization of scandia-doped zirconia

Muccillo¹,

Grosso²,

Reis³

et al. 2017

Matéria (Rio J.)

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The effects of small additions of tin, zinc, calcium and boron oxides on phase composition and electrical conductivity of zirconia-10 mol% scandia were investigated. Compounds containing 1 mol% zinc, tin and calcium oxides and 1, 3 and 5 wt.% boron oxide were prepared by solid state reaction and characterized by X-ray diffraction, density measurements, scanning electron microscopy and impedance spectroscopy. Full stabilization of the cubic structure at room temperature was obtained with additions of 1 mol% calcium oxide and 2 wt.% boron oxide. Partially stabilized compounds exhibit herringbone structure, characteristic of the β-rhombohedric phase. Specimens with calcium as additive show total conductivity of 23.8 mS.cm -1 at 750ºC with activation energy of 1.13 eV. Liquid phase sintering by boron oxide addition is effective to enhance the densification of the solid electrolyte.

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Stability of Sc2O3 and CeO2 co-doped ZrO2 Electrolyte during the Operation of Solid Oxide Fuel Cells

Cited by 29 publications

References 30 publications

Achievements of NEDO Durability Projects on SOFC Stacks in the Light of Physicochemical Mechanisms

Achievements of NEDO Durability Projects on SOFC Stacks in the Light of Physicochemical Mechanisms

Raman Spectroscopy of Solid Oxide Fuel Cells: Technique Overview and Application to Carbon Deposition Analysis

Influence of additives on phase stabilization of scandia-doped zirconia

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