Phase wettability and microstructural evolution in solid oxide fuel cell anode materials

Davis, Ryan S.; Abdeljawad, Fadi F.; Lillibridge, Jeffrey; Haataja, Mikko

doi:10.1016/j.actamat.2014.06.037

Cited by 30 publications

(28 citation statements)

References 36 publications

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“…2. The TPB has been calibrated in most previous phase field simulations [21,23,27] but the Ni/LSM-Ni/LSM-pore triple junction has only been calibrated in Ref. [25] before.…”

Section: Interfacial Energy Calibrationmentioning

confidence: 99%

“…This simplification has two problems. The first is that the cation diffusivity in YSZ is much smaller than the self-diffusivity of Ni and the cation diffusivity in LSM [21,25]. So setting the mobility of YSZ equal to the mobility of Ni/LSM overestimates the particle coarsening of YSZ in SOFC electrodes.…”

Section: Effect Of Mobilitymentioning

confidence: 99%

“…Several phase field models have been proposed to phenomenologically simulate the time evolution of the microstructure and properties of SOFC electrodes. One of the common problems is that some models have ignored the effect of grain boundary on microstructure evolutions [21][22][23][24]. Thus, the grain growth in SOFC electrodes cannot be investigated in these models, and the grain boundary effect on the evolution of the critical properties of SOFC electrodes such as TPB density is unclear yet.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the grain growth in SOFC electrodes cannot be investigated in these models, and the grain boundary effect on the evolution of the critical properties of SOFC electrodes such as TPB density is unclear yet. Another problem is that YSZ phase has been forced to be static in some models [21,25]. Indeed, the evolution of YSZ phase is relatively slow at operational temperatures, but the size change in YSZ phase is still observable [12,26] and can affect the Ni coarsening in YSZ-Ni anode [26].…”

Section: Introductionmentioning

confidence: 99%

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Phase field modeling of microstructure evolution and concomitant effective conductivity change in solid oxide fuel cell electrodes

Lei

Cheng

Wen

2017

Journal of Power Sources

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Microstructure evolution plays an important role in the performance degradation of SOFC electrodes. In this work, we propose a much improved phase field model to simulate the microstructure evolution in the electrodes of solid oxide fuel cell. We demonstrate that the tunability of the interfacial energy in this model has been significantly enhanced. Parameters are set to fit for the interfacial energies of a typical Ni-YSZ anode, an LSM-YSZ cathode and an artificial reference electrode, respectively. The contact angles at various triple junctions and the microstructure evolutions in two dimensions are calibrated to verify the model. As a demonstration of the capabilities of the model, three dimensional microstructure evolutions are simulated applying the model to the three different electrodes. The time evolutions of grain size and triple phase boundary density are analyzed. In addition, a recently proposed bound charge successive approximation algorithm is employed to calculate the effective conductivity of the electrodes during microstructure evolution. The effective conductivity of all electrodes are found to decrease during the microstructure evolution, which is attributed to the increased tortuosity and the loss of percolated volume fration of the electrode phase.

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“…2. The TPB has been calibrated in most previous phase field simulations [21,23,27] but the Ni/LSM-Ni/LSM-pore triple junction has only been calibrated in Ref. [25] before.…”

Section: Interfacial Energy Calibrationmentioning

confidence: 99%

Section: Effect Of Mobilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase field modeling of microstructure evolution and concomitant effective conductivity change in solid oxide fuel cell electrodes

Lei

Cheng

Wen

2017

Journal of Power Sources

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“…High electrochemical performance required a high TPB in the anode, because increasing the TPB density will enhance the kinetics of the oxidation reaction that occurs between oxygen ions and methane fuel on the anode side of the cell, and thus increase cell performance. Using 3D imaging techniques like FIB-SEM [14,[30][31][32][33], the nanocomposite anodes with optimized electrode microstructure exhibit substantially higher TPB density, leading to higher cell performance and better stability [15,16,[34][35][36]. Therefore, the new double-pore NiO-SDC anode with a wider TPB area is much more promising for direct-methane solid oxide fuel cells, compared with the conventional single-pore NiO-SDC anode.…”

Section: Electrochemical Performance Of Single Cellsmentioning

confidence: 99%

A robust NiO–Sm0.2Ce0.8O1.9 anode for direct-methane solid oxide fuel cell

Tian

Liu

Chen

et al. 2015

Materials Research Bulletin

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A robust NiO-Sm0.2Ce0.8O1.9 anode for direct-methane solid oxide fuel cell, Materials Research Bulletin http://dx.doi.org/10. 1016/j.materresbull.2015.06.042 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Graphical abstractHighlights  Robust NiO-SDC anode is synthesized by co-assembly for direct-methane SOFC. The cell performance was improved by 40%-45% with the new NiO-SDC anode. No significant degradation of the cell performance was observed after 60 hours. The double-pore NiO-SDC anode with higher TPB is promising for SOFC. AbstractIn order to directly use methane without a reforming process, NiO-Sm 0.2 Ce 0.8 O 1.9 (NiO-SDC) nanocomposite anode are successfully synthesized via a one-pot, surfactant-assisted co-assembly approach for direct-methane solid oxide fuel cells.Both NiO with cubic phase and SDC with fluorite phase are obtained at 550°C. Both 2 NiO nanoparticles and SDC nanoparticles are highly monodispersed in size with nearly spherical shapes. Based on the as-synthesized NiO-SDC, two kinds of single cells with different micro/macro-porous structure are successfully fabricated. As a result, the cell performance was improved by 40%-45% with the new double-pore NiO-SDC anode relative to the cell performance with the conventional NiO-SDC anode due to a wider triple-phase-boundary (TPB) area. In addition, no significant degradation of the cell performance was observed after 60 hours, which means an increasing of long term stability. Therefore, the as-synthesized NiO-SDC nanocomposite is a promising anode for direct-methane solid oxide fuel cells.

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Phase Field Modelling of Microstructural Changes in NI/YSZ Solid Oxide Electrolysis Cell Electrodes

Trini

Angelis

Jørgensen

et al. 2019

Ceramic Engineering and Science Proceedings

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Solid oxide cells (SOC) are electrochemical devices that can operate efficiently both in fuel cell (solid oxide fuel cell, SOFC) and electrolysis mode (solid oxide electrolysis cell, SOEC). However, long-term performance degradation hinder the widespread commercialization of this technology. Nickel coarsening is a major cause of the decrease of the cells' performance. Therefore, investigating and quantifying effects of nickel coarsening on the microstructural evolution in SOCs is crucial to understand the degradation processes occurring during operation. Focused-ion-beam scanning electron microscopy (FIB-SEM) tomography and phase field (PF) modelling are used to investigate the microstructure evolution of Ni/Yttria-Stabilized Zirconia (YSZ) SOC fuel electrodes. A cell, tested as part of a 25 cells stack for 9000 hours, and a reference cell (never operated) are reconstructed using FIB-SEM tomography. Microstructural parameters were calculated on the two cells showing that the percolated triple phase boundary (TPB) length in the cell decreases from 1.85 µm/µm 3 for the reference cell to only 1.01 µm/µm 3 for the long-term tested one. Phase field simulations were run on the reference cell geometry and microstructural parameters such as particle size distribution (PSD), TPB length and surface areas are computed and quantified on the simulated volumes. A trend of decreasing percolated TPB length with time is observed in the simulations. The numerical results are used to investigate the effects of nickel coarsening as well as to obtain information on the kinetics of the phenomenon.

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Phase wettability and microstructural evolution in solid oxide fuel cell anode materials

Cited by 30 publications

References 36 publications

Phase field modeling of microstructure evolution and concomitant effective conductivity change in solid oxide fuel cell electrodes

Phase field modeling of microstructure evolution and concomitant effective conductivity change in solid oxide fuel cell electrodes

A robust NiO–Sm0.2Ce0.8O1.9 anode for direct-methane solid oxide fuel cell

Phase Field Modelling of Microstructural Changes in NI/YSZ Solid Oxide Electrolysis Cell Electrodes

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