Impurity features in Ni-YSZ-H2-H2O electrodes

Utz, Annika; Hansen, Kent Kammer; Norrman, Kion; Ivers-Tiffée, Ellen; Mogensen, Mogens Bjerg

doi:10.1016/j.ssi.2010.12.014

Cited by 29 publications

(17 citation statements)

References 15 publications

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“…3.27 10 1065.3 [15] 3.34 10 exp [16] These coupled equations were solved by the LBM. The details of the calculation methods are described in Refs.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Furthermore, it is reported that segregation of impurities at TPB will increase the overpotential, which means that local exchange current density might deteriorate during the operation. [13][14][15]. Therefore, the change in exchange current density can be considered as one of the factors which leads to the change in electrode performance during the operation.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of nickel-yttria stabilized zirconia anode degradation during discharge operation and redox cycles operation by electrochemical calculation

Shimura

Jiao

Shikazono

2016

Journal of Power Sources

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Degradation of Solid Oxide Fuel Cell (SOFC) anode during discharge operation and redox cycles operation were evaluated by three-dimensional electrochemical calculations using a Lattice Boltzmann method (LBM). Three dimensional microstructures were obtained by Focused Ion Beam Scanning Electron Microscopy (FIB-SEM) reconstruction. In the electrochemical calculations, changes in exchange current density and ionic conductivity of Yttria stabilized Zirconia (YSZ) during the operations were assumed and their values were calculated by fitting the calculated overpotential values to the experimental ones.

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“…3.27 10 1065.3 [15] 3.34 10 exp [16] These coupled equations were solved by the LBM. The details of the calculation methods are described in Refs.…”

Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of nickel-yttria stabilized zirconia anode degradation during discharge operation and redox cycles operation by electrochemical calculation

Shimura

Jiao

Shikazono

2016

Journal of Power Sources

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“…Adaption of sintering process (heating rate, holding time, temperature steps) is necessary. • The potential of glass phase formation [26][27][28] caused by volatile silicon originating from the support and associated performance losses must be investigated.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale characterization of ceramic inert-substrate-supported and co-sintered solid oxide fuel cells

et al. 2020

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Understanding cell performance is essential for selecting cell components and the processing parameters for solid oxide fuel cells. The scale of relevant microstructural features in electrodes, electrolyte and supporting substrate covers several orders of magnitude. This contribution will demonstrate how advanced correlative multi-scale tomography can be used to identify those parameters: ranging from millimeter to nanometer scale. We employ optical microscopy, X-ray computed tomography (l-CT), focused ion beam-scanning electron microscopy tomography and energy-dispersive X-ray spectroscopyscanning transmission electron microscopy. Additional investigations by selected area electron diffraction allow a determination of the underlying crystal structures. An SOFC design based on the co-sintering of an inert substrate with various functional layers on top is used as a blueprint, allowing further methodological development. The effect of interdiffusion between phases and development of secondary phases on microstructure and chemical composition will be shown. Furthermore, porosity and tortuosity extracted individually from all porous layers will allow modeling of gas diffusion loss contributions within the co-fired cell structure. This exemplifies how correlative tomography helps to understand specific contributions to overall cell performance. Abbreviations ASR Area specific resistance CCL Cathode current collector layer (LSM) CFL Cathode functional layer (LSM-YSZ) CT X-ray computed tomography D K,O2 Oxygen Knudsen diffusion coefficient

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“…In these experiments special care was taken, by carefully choosing appropriate pCO and pCO 2 partial pressure ranges, to avoid both oxidation of the Ni electrode material as well as carbon deposition on the Ni surface due to the Boudouard reaction. In addition, in contrast to previously-reported CO oxidation studies on Ni/YSZ pattern model anodes (9), which suffered from ill-defined TPB lengths (due to uncontrolled Ni island formation during the course of the experiments), the experiments of Utz et al (8) were accompanied by thorough pre-and post-test analysis of the Ni pattern structures (10)(11)(12)(13), which allowed for a quantitative determination of the actual TPB length as well as the impurity content of the sample. Hence, the results of Utz et al can be at present regarded as the most detailed experimental investigations of the electrochemical CO oxidation over Ni/YSZ pattern model anodes.…”

Section: Introductionmentioning

confidence: 94%

Elementary Kinetic Numerical Simulation of Electrochemical CO Oxidation on Ni/YSZ Pattern Anodes

Yurkiv,

Utz,

Weber

et al. 2011

Meet. Abstr.

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Results of a numerical simulation analysis of recent experimental data obtained in a comprehensive study of electrochemical CO oxidation on well-defined Ni/YSZ patterned model anodes [Utz et al. )] are presented. A computational model representing the coupled behavior of heterogeneous chemistry and electrochemistry in terms of elementary reactions was developed, which allows for a quantitative description of the complete experimental data set, which covers a wide range of CO/CO 2 gas compositions (4.0·10 2 Pa ≤ pCO ≤ 5.1·10 4 Pa and 9.5·10 2 Pa ≤ pCO 2 ≤ 9.2·10 4 Pa) and operating temperatures (973 K ≤ T ≤ 1073 K). In the framework of the presented model a direct mechanistic interpretation of the experimentally observed electrochemical characteristics is obtained.

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Impurity features in Ni-YSZ-H2-H2O electrodes

Cited by 29 publications

References 15 publications

Evaluation of nickel-yttria stabilized zirconia anode degradation during discharge operation and redox cycles operation by electrochemical calculation

Evaluation of nickel-yttria stabilized zirconia anode degradation during discharge operation and redox cycles operation by electrochemical calculation

Multi-scale characterization of ceramic inert-substrate-supported and co-sintered solid oxide fuel cells

Elementary Kinetic Numerical Simulation of Electrochemical CO Oxidation on Ni/YSZ Pattern Anodes

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