Role of microstructure on electrode operating mechanisms for mixed ionic electronic conductors: From synchrotron-based 3D reconstruction to electrochemical modeling

Hubert, Maxime; Laurencin, Jérôme; Cloetens, Peter; Silva, Júlio César da; Lefebvre‐Joud, Florence; Bleuet, Pierre; Nakajo, Arata; Siebert, Elisabeth

doi:10.1016/j.ssi.2016.07.001

Cited by 52 publications

(78 citation statements)

References 67 publications

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“…Different noise-free models and their combinations [39,48] have been tested. It has been found that the exponential 10 correlation of second order (Gaussian) is the most suitable function to obtain a good fit of…”

Section: Two-phase Materials For O2 Electrodementioning

confidence: 99%

“…For this purpose, the electrodes active layers of both cells, in which the electrochemical reactions take place, have 14 been reconstructed by synchrotron X-ray holotomography [21,22]. The method, which has been adapted for the highly absorbent ceramic materials, presents the advantage to get 3D volumes with a large field of view (50 µm) and the ability to resolve details in the microstructure of few tens of nanometers [10]. The samples for the tomographic experiments have been prepared by milling cylindrical pillars in the cells with a Plasma Focused Ions Beam (PFIB) working with…”

Section: D Reconstructions By Synchrotron X-ray Nano-holotomography mentioning

confidence: 99%

“…4a) [10]. The samples have then been scanned at ID16A Nano-Imaging beam line (ESRF) with selected X-ray energies of 17.05 KeV and 33.6 KeV for the O2 and H2…”

Section: D Reconstructions By Synchrotron X-ray Nano-holotomography mentioning

confidence: 99%

“…fuel cell, steam electrolysis, reversible system, etc.). Indeed, the microstructure of the electrodes plays a major role in the global cell performances by controlling the rates of the electrochemical reactions which depend on each SOC application [7][8][9][10]. As a consequence, the electrode microstructure can be tuned to design more efficient SOC for each particular utilization.…”

Section: Introductionmentioning

confidence: 99%

“…Different techniques based on Focused Ion Beam sectioning coupled with a Scanning Electron Microscope (FIB-SEM) [15][16][17], X-ray absorption tomography [18][19][20] or holotomography [10,[21][22] have been successfully employed to reconstruct the SOCs electrodes microstructures with a high spatial resolution (at the scale of few tens of nanometers).…”

Section: Introductionmentioning

confidence: 99%

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Stochastic geometrical modeling of solid oxide cells electrodes validated on 3D reconstructions

Moussaoui

Laurencin

Gavet

et al. 2018

Computational Materials Science

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106

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Abstract. An original 3D stochastic model, based on the truncated plurigaussian random fields, has been adapted to simulate the complex microstructure of SOC electrodes. The representativeness of the virtual microstructures has been checked on several synchrotron Xray and FIB-SEM tomographic reconstructions obtained on typical LSCF, LSC and Ni-YSZ electrodes. The validation step has been carried out by comparing numbers of electrode morphological properties as well as the phase effective diffusivities. This analysis has shown that the synthetic media mimic accurately the complex microstructure of typical SOC electrodes. The model capability to simulate different types of promising electrode architectures has also been investigated. It has been shown that the model is able to generate virtual electrode prepared by infiltration resulting in a uniform and continuous thin layer covering a scaffold.With a local thresholding depending on the position, continuous graded electrodes can be also produced. Finally, the model offers the possibility to introduce different correlation lengths for each phase in order to control the local topology of the interfaces. All these cases illustrate the model flexibility to generate various SOC microstructures. This validated and flexible model can be used for further numerical microstructural optimizations to improve the SOC performances.Keyword: Solid Oxide Cell, 3D microstructure model, truncated plurigaussian random fields, X-ray tomography, Electrode design.

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Section: Two-phase Materials For O2 Electrodementioning

confidence: 99%

Section: D Reconstructions By Synchrotron X-ray Nano-holotomography mentioning

confidence: 99%

“…4a) [10]. The samples have then been scanned at ID16A Nano-Imaging beam line (ESRF) with selected X-ray energies of 17.05 KeV and 33.6 KeV for the O2 and H2…”

Section: D Reconstructions By Synchrotron X-ray Nano-holotomography mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stochastic geometrical modeling of solid oxide cells electrodes validated on 3D reconstructions

Moussaoui

Laurencin

Gavet

et al. 2018

Computational Materials Science

Self Cite

106

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Addressing planar solid oxide cell degradation mechanisms: A critical review of selected components

McPhail

Frangini

Laurencin

et al. 2021

Electrochemical Science Adv

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In this review paper, a critical assessment of the main degradation processes in three key components of solid oxide fuel cells and electrolysers (negative and positive electrodes and the interconnect) is undertaken, attempting prioritization of respective degradation effects and recommendation of the best approaches in their experimental ascertainment and numerical modeling.Besides different approaches to quantifying the degradation rate of an operating solid oxide cell (SOC), the latest advancements in microstructural representation (3D imaging and reconstruction) of SOC electrodes are reviewed, applied to the quantification of triple-phase boundary (TPB) lengths and morphology evolution over time. The intrinsic degradation processes in the negative (fuel)This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Reaction Mechanism and Impact of Microstructure on Performances for the LSCF‐CGO Composite Electrode in Solid Oxide Cells

et al. 2019

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The reaction mechanism and the impact of microstructure on performances for a porous LSCF‐CGO composite used as O2 electrode in SOCs have been investigated. For this purpose, an integrated approach coupling (i) electrochemical testing, (ii) advanced 3D characterizations, and (iii) modeling was proposed. In this frame, a symmetrical cell was tested in a three‐electrode setup and the microstructure of the LSCF‐CGO working electrode was reconstructed by FIB‐SEM tomography. The experimental polarization curves and the impedance diagrams along with the extracted microstructural parameters were used to validate an in‐house microscale electrochemical model. This model considers two parallel reaction pathways with (i) an oxidation/reduction at TPBls (surface path) and (ii) an oxygen transfer at the gas/LSCF interface (bulk path). It was shown that the LSCF‐CGO electrode reaction mechanism is mostly controlled by the charge transfer at TPBls whatever the polarization. Finally, the impact of electrode composition, porosity and particles size on the cell polarization resistance was investigated by using the electrochemical model in combination with a large dataset of synthetic microstructures generated by a geometrical stochastic model. The effect of each microstructural parameter on the electrode performance was analyzed in order to provide useful guidelines for the cell manufacturing.

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Role of microstructure on electrode operating mechanisms for mixed ionic electronic conductors: From synchrotron-based 3D reconstruction to electrochemical modeling

Cited by 52 publications

References 67 publications

Stochastic geometrical modeling of solid oxide cells electrodes validated on 3D reconstructions

Stochastic geometrical modeling of solid oxide cells electrodes validated on 3D reconstructions

Addressing planar solid oxide cell degradation mechanisms: A critical review of selected components

Reaction Mechanism and Impact of Microstructure on Performances for the LSCF‐CGO Composite Electrode in Solid Oxide Cells

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