Properties of Ni/YSZ cermet as anode for SOFC

Koide, Hideto; Someya, Yoshiyuki; Yoshida, Toshihiko; Maruyama, Toru

doi:10.1016/s0167-2738(00)00652-4

Cited by 212 publications

(97 citation statements)

References 4 publications

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“…This system is very promising because zirconia and nickel are chemically stable and do not react with each other over a wide range of temperatures [6,7]. According to the literature reports, this composite can be applied as thermal barriers, as sensor, and as anode for solid oxide fuel cells [8,9]. The potential application of such materials is the reason for continuing work on this composite system carried out by many research centers [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of ZrO2/Ni composites

et al. 2018

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This paper focuses on a research on the influence of nickel content in zirconia matrix and its impact on the mechanical properties of obtained composites. ZrO 2 /Ni mixed powders were uniaxially pressed and sintered in a nitrogen atmosphere to obtain ZrO 2 /Ni composites that were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive Xray spectroscopy (EDS). The stereological analysis allows obtaining information about the size distribution of zirconia grains in the sintered composites. Relative density, hardness, fracture toughness, and bending strength were also analyzed. The results revealed that the presence of Ni particles in the composites affects the mechanical properties of the materials. An increased Ni concentration caused a decrease in Vickers hardness and increased the fracture toughness of the ZrO 2 /Ni composites compared to the ZrO 2 samples. This kind of composite is of interest for temperature and flow sensors, thermal barrier coatings for gas turbines and supersonic propulsion systems of spacecrafts, as well as as a material for anode in solid oxide fuel cell.

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Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of ZrO2/Ni composites

et al. 2018

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“…3YSZ, 10YSZ). Most discussed with regard to the applications-especially in the solid oxide fuel cells (SOFC) technology [6][7][8])-is 8YSZ; however, studies are still being conducted continuously for improving the properties of YSZ materials in order to overcome the previously mentioned disadvantages of this system. One way would be to use the appropriately modified tetragonal system (as 3YSZ) in applications that require higher conductivity; so far, the previous studies have only used the 8YSZ.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of silica-doped 3 mol% yttria-stabilized tetragonal zirconia

et al. 2016

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Inconsistent opinions in the literature on the impact of silica on the conductivity of Y 2 O 3 -ZrO 2 system become a motivating reason to reinvestigate this matter. Too low a value of the grain boundaries' conductivity in the case of 3YSZ (3 mol% yttriastabilized zirconia) is a fundamental barrier to using this material in the solid oxide fuel cell technology. The presence of silica is considered as the main cause of blocking effect on grain boundaries. The main purpose of this study involved the synthesis of nanomaterials, 3YSZ, with the addition of restricted amounts of silica. Two series of samples were prepared and sintered at the temperatures of 1073 and 1473 K. Then the obtained materials were tested for their phase composition, microstructure and electrical properties (based on analysis of the impedance spectra). The SEM microphotograph analysis indicated the decrease in the grain sizes of zirconia with the addition of SiO 2 . Moreover, X-ray diffraction measurements showed the beginning of formation of zirconium silicate at 1473 K. The detailed investigation of microstructures and electrical properties shows that the two factors reported in the literature have an influence on grain boundary conductivity-grains sizes and the amount of introduced silica. Presented studies shows that up to temperature in which silica reacts with zirconia to form zircon (ZrSiO 4 ), its presence actually improves the grain boundaries conductivity due to decrease in particle size of YSZ (pinning effect). The blocking effect of silica at the grain boundaries begins to play a greater role causing the formation of glassy layers at a higher temperature.

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“…The most common material used for SOFC anodes is a mixture of Ni and YSZ, which is known as Ni-YSZ cermet (ceramic-metallic composite) [108]. Ni provides the conductivity and catalytic activity, while YSZ provides oxygen ion conductivity and helps maintain porosity.…”

Section: Modification Of Sofc Anodesmentioning

confidence: 99%

Atomic Layer Deposition on Porous Materials: Problems with Conventional Approaches to Catalyst and Fuel Cell Electrode Preparation

et al. 2018

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Atomic layer deposition (ALD) offers exciting possibilities for controlling the structure and composition of surfaces on the atomic scale in heterogeneous catalysts and solid oxide fuel cell (SOFC) electrodes. However, while ALD procedures and equipment are well developed for applications involving flat surfaces, the conditions required for ALD in porous materials with a large surface area need to be very different. The materials (e.g., rare earths and other functional oxides) that are of interest for catalytic applications will also be different. For flat surfaces, rapid cycling, enabled by high carrier-gas flow rates, is necessary in order to rapidly grow thicker films. By contrast, ALD films in porous materials rarely need to be more than 1 nm thick. The elimination of diffusion gradients, efficient use of precursors, and ligand removal with less reactive precursors are the major factors that need to be controlled. In this review, criteria will be outlined for the successful use of ALD in porous materials. Examples of opportunities for using ALD to modify heterogeneous catalysts and SOFC electrodes will be given.

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Properties of Ni/YSZ cermet as anode for SOFC

Cited by 212 publications

References 4 publications

Fabrication and characterization of ZrO2/Ni composites

Fabrication and characterization of ZrO2/Ni composites

Electrical properties of silica-doped 3 mol% yttria-stabilized tetragonal zirconia

Atomic Layer Deposition on Porous Materials: Problems with Conventional Approaches to Catalyst and Fuel Cell Electrode Preparation

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