Ni–YSZ gradient anodes for anode-supported SOFCs

Kong, Jiangrong; Sun, Kening; Zhou, Dengwang; Zhang, Naiqing; Ju, Mun-No; Qiao, Jinshuo

doi:10.1016/j.jpowsour.2006.12.042

Cited by 107 publications

(52 citation statements)

References 13 publications

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“…In this frame, the Functionally Graded Materials (FGM), which exhibit a spatial distribution in the composition and/or in the structure, are nowadays widely studied as advanced engineering materials [74]. The concept of FGM has been applied to the SOC electrodes in an attempt to enhance the cell efficiency and reliability [75,76]. With a gradient in composition and/or particle size for both electronic and ionic conducting phases, it has been shown that the electrode performances may be improved by optimizing the ohmic losses in the active layer [77,78].…”

Section: Introduction Of a Local Thresholding: Illustration On The Grmentioning

confidence: 99%

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

Moussaoui

Laurencin

Gavet

et al. 2018

Computational Materials Science

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: Introduction Of a Local Thresholding: Illustration On The Grmentioning

confidence: 99%

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

Moussaoui

Laurencin

Gavet

et al. 2018

Computational Materials Science

106

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“…However, as already discussed, the presence YSZ particles into the SL, above the percolation threshold, is beneficial from the point of view of the electrochemical performance, allowing a possible extension of the electrochemical reaction also into the SL. In addition, the presence of YSZ into the SL avoids Ni agglomeration and ensures that the TEC is as close as possible to that of the AL [24]. Due to the importance of this last issue, the Ni content of the SL is usually around 50%, and in some cases another additional layer is introduced between the AL and the SL [58,59], which allows a smoother transition.…”

Section: Effect Of Support Layer Characteristicsmentioning

confidence: 99%

“…Instead, the AL contains a prevailing amount of ionic conductor, in order to enhance the conduction of the oxygen ions coming from the electrolyte, and also to enhance adhesion to the electrolyte. The different composition of the AL and SL is an important factor, also in view of providing a gradual variation of TEC across the anode, in order to prevent possible delamination [24]. An overview of the AL and SL features is given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

2014

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Abstract:Intermediate temperature-solid oxide fuel cell (IT-SOFC) Ni-(ZrO 2 ) x (Y 2 O 3 ) 1−x (Ni-YSZ) anodes formed by two layers, with different thicknesses and morphologies, offer the possibility of obtaining adequate electrochemical performance coupled to satisfactory mechanical properties. We investigate bi-layered Ni-YSZ anodes from a modeling point of view. The model includes reaction kinetics (Butler-Volmer equation), mass transport (Dusty-Gas model), and charge transport (Ohm's law), and allows to gain an insight into the distribution of the electrochemical reaction within the electrode. Additionally, the model allows to evaluate a reciprocal overall electrode resistance 1/R p ≈ 6 S· cm −2 for a bi-layer electrode formed by a 10 µm thick active layer (AL) composed of 0.25 µm radius Ni and YSZ particles (34% vol. Ni), coupled to a 700 µm thick support layer (SL) formed by 0.5 µm radius Ni and YSZ particles (50% vol. Ni), and operated at a temperature of 1023 K. Simulation results compare satisfactorily to literature experimental data. The model allows to investigate, in detail, the effect of morphological and geometric parameters on the various sources of losses, which is the first step for an optimized electrode design.

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“…It is known that incorporation of gadolinium doped ceria (GDC) into conventional thick film Ni-YSZ anodes interfaced with YSZ electrolyte improves SOFC performance when operated with hydrogen or with methane [9][10][11][12][13] although such modification increases the mismatch of thermal properties at the critically important GDC anode/YSZ electrolyte interface, which can result in poor adhesion and cracking of the anode during high temperature treatment [14]. Additionally, despite the favorable properties of Ni/ceria-based oxides in regard to direct electrochemical carbon conversion [15] the reactivity of ceria with YSZ during anode sintering has limited its use [16].…”

Section: Introductionmentioning

confidence: 99%

High performance novel gadolinium doped ceria/yttria stabilized zirconia/nickel layered and hybrid thin film anodes for application in solid oxide fuel cells

García‐García

Beltrán

Yubero

et al. 2017

Journal of Power Sources

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Magnetron sputtering under oblique angle deposition was used to produce Ni-containing ultra thin film anodes comprising alternating layers of gadolinium doped ceria (GDC) and yttria stabilized zirconia (YSZ) of either 200 nm or 1000 nm thickness. The evolution of film structure from initial deposition, through calcination and final reduction was examined by XRD, SEM, TEM and TOF-SIMS. After subsequent fuel cell usage, the porous columnar architecture of the two-component layered thin film anodes was maintained and their resistance to delamination from the underlying YSZ electrolyte was superior to that of corresponding single component Ni-YSZ and Ni-GDC thin films. Moreover, the fuel cell performance of the 200 nm layered anodes compared favorably with conventional commercially available thick anodes. The observed dependence of fuel cell performance on individual layer thicknesses prompted study of equivalent but more easily fabricated hybrid anodes consisting of simultaneously deposited Ni-GDC and Ni-YSZ, which procedure resulted in exceptionally intimate mixing and interaction of the components. The hybrids exhibited very unusual and favorable I V characteristics, along with exceptionally high power densities at high currents. Their discovery is the principal contribution of the present work.

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Ni–YSZ gradient anodes for anode-supported SOFCs

Cited by 107 publications

References 13 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

Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

High performance novel gadolinium doped ceria/yttria stabilized zirconia/nickel layered and hybrid thin film anodes for application in solid oxide fuel cells

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