Enhanced hydrogen oxidation activity and H 2 S tolerance of Ni-infiltrated ceria solid oxide fuel cell anodes

Mirfakhraei, Behzad; Paulson, Scott; Thangadurai, Venkataraman; Birss, Viola I.

doi:10.1016/j.jpowsour.2013.05.150

Cited by 18 publications

(31 citation statements)

References 32 publications

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“…The behavior of the sulfur coverage on Ni and the voltage drop is indeed strikingly similar, which indicates that the observed Ni/CGO sulfur poisoning could be caused by Ni surface poisoning. This is consistent with previous studies in which Ni infiltration enhances the same low‐frequency process as the sulfur poisoning of CGO slows down …”

Section: Resultssupporting

confidence: 93%

Evaluation of the Effect of Sulfur on the Performance of Nickel/Gadolinium‐Doped Ceria Based Solid Oxide Fuel Cell Anodes

et al. 2016

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The focus of this study is the measurement and understanding of the sulfur poisoning phenomena of Ni/gadolinium‐doped ceria (CGO) based solid oxide fuel cells (SOFC). Cells with Ni/CGO10 and NiCu5/CGO40 anodes were characterized by using impedance spectroscopy at different temperatures and H2/H2O fuel ratios. The short‐term sulfur poisoning behavior was investigated systematically at temperatures of 800–950 °C, current densities of 0–0.75 A cm−2, and H2S concentrations of 1–20 ppm. A sulfur poisoning mitigation effect was observed at high current loads and temperatures. The poisoning behavior was reversible for short exposure times. It was observed that the sulfur‐affected processes exhibited significantly different relaxation times that depend on the Gd content in the CGO phase. Moreover, it was demonstrated that the capacitance of Ni/CGO10 anodes is strongly dependent on the temperature and gas‐phase composition, which reflects a changing Ce3+/Ce4+ ratio.

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Section: Resultssupporting

confidence: 93%

Evaluation of the Effect of Sulfur on the Performance of Nickel/Gadolinium‐Doped Ceria Based Solid Oxide Fuel Cell Anodes

et al. 2016

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“…[8][9][10][11][12][13] Other technological advantages are a wide choice of catalyst materials, a good adhesion and a reduced thermal expansion mismatch between the electrode and the electrolyte. 3 On the other hand, the long-term stability and the fabrication cost of nanostructured electrodes still need to be properly addressed.…”

mentioning

confidence: 99%

A Particle-Based Model for Effective Properties in Infiltrated Solid Oxide Fuel Cell Electrodes

Bertei

Pharoah

Gawel

et al. 2014

J. Electrochem. Soc.

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A modeling framework for the numerical reconstruction of the microstructure of infiltrated electrodes is presented in this study. A particle-based sedimentation algorithm is used to generate the backbone, while a novel packing algorithm is used to randomly infiltrate nanoparticles on the surface of backbone particles. The effective properties, such as the connected triple-phase boundary length, the effective conductivity, the effective diffusivity, are evaluated on the reconstructed electrodes by using geometric analysis, finite volume and random-walk methods, and reported in dimensionless form to provide generality to the results. A parametric study on the effect of the main model and operating parameters is performed. Simulations show that the critical loading (i.e., the percolation threshold) increases as the backbone porosity decreases and the nanoparticle diameter increases. Large triple-phase boundary length, specific surface area and good effective conductivity can be reached by infiltration, without detrimental effects on the effective transport properties in gas phase. Simulations reveal a significant sensitivity to the size and contact angle of infiltrated particles, suggesting that the preparation process of infiltrated electrodes should be properly tailored in order to obtain the optimized structures predicted by the model. In the last decade, much attention has been drawn toward nanostructured electrodes for solid oxide fuel cells (SOFCs) prepared via infiltration techniques.1-7 The main reason is reduced polarization resistance, with corresponding increased power density, in comparison with conventional electrodes prepared via traditional mixing and sintering processes. The improved performance of infiltrated electrodes holds even at intermediate temperatures (500-800• C), as demonstrated by a large number of experimental studies. [8][9][10][11][12][13] Other technological advantages are a wide choice of catalyst materials, a good adhesion and a reduced thermal expansion mismatch between the electrode and the electrolyte.3 On the other hand, the long-term stability and the fabrication cost of nanostructured electrodes still need to be properly addressed. 2,3The infiltration (or impregnation) technique involves the deposition of nanoparticles into a pre-sintered backbone of micrometer-size particles.1,3 The backbone is a skeletal structure typically composed of a single component, such as yttria-stabilized zirconia (YSZ) 5,8 or, in alternative, a mixed ionic-electronic conductor (e.g., lanthanum strontium cobalt ferrite LSCF).14 However, composite backbones, such as the usual lanthanum strontium manganite (LSM)/YSZ cathode, have also been used. 1,15 The sintering of the backbone is performed at high temperature in order to ensure structural stability of the electrode and good connection among backbone particles. 3 In the following step, nanoparticles are infiltrated in the backbone using different methods (such as metal salt precipitation, 2 nanoparticle dispersion, 16 molten salts) 1 and then sinte...

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“…Infiltration enables the use of metals that cannot be processed at high temperatures, for example copper. Although, the performance of the resulting anodes is excellent and it even seems to improve H 2 S tolerance [12], questions arise as to the practicability of up-scaling this procedure to make it economically feasible. Impregnation is commonly used in catalysis [13,14] where adequate loadings of metals can be achieved in a single impregnation step into a very highly porous support.…”

Section: Introductionmentioning

confidence: 99%

Metallizing porous scaffolds as an alternative fabrication method for solid oxide fuel cell anodes

Ruiz‐Trejo

Atkinson

Brandon

2015

Journal of Power Sources

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Enhanced hydrogen oxidation activity and H 2 S tolerance of Ni-infiltrated ceria solid oxide fuel cell anodes

Cited by 18 publications

References 32 publications

Evaluation of the Effect of Sulfur on the Performance of Nickel/Gadolinium‐Doped Ceria Based Solid Oxide Fuel Cell Anodes

Evaluation of the Effect of Sulfur on the Performance of Nickel/Gadolinium‐Doped Ceria Based Solid Oxide Fuel Cell Anodes

A Particle-Based Model for Effective Properties in Infiltrated Solid Oxide Fuel Cell Electrodes

Metallizing porous scaffolds as an alternative fabrication method for solid oxide fuel cell anodes

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