Characterization of NiO–yttria stabilised zirconia (YSZ) hollow fibres for use as SOFC anodes

Droushiotis, Nicolas; Doraswami, Uttam; Kanawka, Krzysztof; Kelsall, G. H.; Li, K.

doi:10.1016/j.ssi.2009.04.004

Cited by 80 publications

(61 citation statements)

References 25 publications

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“…It is important to note that the mechanical strength of all HFs investigated in this study was significantly higher than these reported by Droushiotis et al [10], where a dedicated sample holder was required to test a sample without breaking. Figure 3a and b shows the SEM image of the dual-layer NiO/NiO-YSZ precursor fibers prepared in this study.…”

Section: Original Research Papercontrasting

confidence: 66%

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NI/NI‐YSZ Current Collector/Anode Dual Layer Hollow Fibers for Micro‐Tubular Solid Oxide Fuel Cells

et al. 2011

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A co‐extrusion technique was employed to fabricate a novel dual layer NiO/NiO‐YSZ hollow fiber (HF) precursor which was then co‐sintered at 1,400 °C and reduced at 700 °C to form, respectively, a meshed porous inner Ni current collector and outer Ni‐YSZ anode layers for SOFC applications. The inner thin and highly porous “mesh‐like” pure Ni layer of approximately 50 μm in thickness functions as a current collector in micro‐tubular solid oxide fuel cell (SOFC), aiming at highly efficient current collection with low fuel diffusion resistance, while the thicker outer Ni‐YSZ layer of 260 μm acts as an anode, providing also major mechanical strength to the dual‐layer HF. Achieved morphology consisted of short finger‐like voids originating from the inner lumen of the HF, and a sponge‐like structure filling most of the Ni‐YSZ anode layer, which is considered to be suitable macrostructure for anode SOFC system. The electrical conductivity of the meshed porous inner Ni layer is measured to be 77.5 × 105 S m–1. This result is significantly higher than previous reported results on single layer Ni‐YSZ HFs, which performs not only as a catalyst for the oxidation reaction, but also as a current collector. These results highlight the advantages of this novel dual‐layer HF design as a new and highly efficient way of collecting current from the lumen of micro‐tubular SOFC.

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Section: Original Research Papercontrasting

confidence: 66%

“…Details of the procedure can be found elsewhere [10,31]. Each sample was measured at several different lengths and linear fits to the generated V-I data were used to determine fiber resistance from which the bulk conductivity of the HF (r fiber , S m -1 ) was calculated using the equation below:…”

Section: Characterisations Of Dual-layer Hfsmentioning

confidence: 99%

NI/NI‐YSZ Current Collector/Anode Dual Layer Hollow Fibers for Micro‐Tubular Solid Oxide Fuel Cells

et al. 2011

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“…Compared to ram extrusion, PI may decrease costs, enable better control of structures of extruded layers and impose minimal restrictions on HF lengths and diameters. The extrusion of both single layer and double layer HFs using PI, for use in SOFC technology, has been reported previously (1,2,3,4,5,6,7,8).…”

Section: Introductionmentioning

confidence: 94%

New Fabrication Techniques for Micro-Tubular Hollow Fiber Solid Oxide Fuel Cells

2013

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A novel combination of phase inversion and electrophoretic deposition was used in the fabrication of anode supported micro tubular (hollow fiber) solid oxide fuel cells (MT-HF-SOFCs). The phase inversion process was used to produce ca. 240 μm thick, highly porous 60 wt. % NiO-40 wt. % yttria-stabilised zirconia (YSZ) hollow fiber anode precursors. The electrophoretic deposition process was then used to apply ca. 40 μm thick, particulate YSZ electrolyte layers onto the unsintered NiO-YSZ HFs from an ethanol suspension at an applied electric field of ca. 0.22 kV cm -1 . The YSZ-coated NiO-YSZ HFs were sintered at 1500 o C for twelve hours. Dispersions of YSZ-LSM particles were then painted on top of the electrolyte layer, as 'graded' YSZ-LSM porous cathode precursors that were sintered at 1200 o C for three hours. The fabrication process was completed by winding silver wire current collectors spirally round the cathodes and through the lumen of the fibers to enable current collection from the anodes. Single MT-HF-SOFCs delivered peak power densities of 0.20, 0.18 and 0.14 W cm

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“…The fibers are very thin, <1 mm in diameter and with a wall of 200 µm in thickness, thereby increasing the specific surface area of the electrodes and increasing the VPD. Details of the preparation of anode HFs can be seen in a recent report (Droushiotis et al, 2009). This technique can also be used to produce dual layers of anode and electrolyte (Othman et al, 2011b).…”

Section: Hollow Fibersmentioning

confidence: 99%

Fabrication Methods and Performance in Fuel Cell and Steam Electrolysis Operation Modes of Small Tubular Solid Oxide Fuel Cells: A Review

2014

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Higher energetic density, better resistance to thermal stresses, and smaller starting times as compared with conventional planar stacks, make the so-called microtubular SOFC (mT-SOFCs with diameters in the millimeter size region) devices suitable for portable applications in the sub kilowatt energy range. However, fabrication of mT-SOFCs is a challenging process, where a number of ceramic layers with different compositions and characteristics have to be placed together in the cylindrical device. Several co-sintering processes have to be performed at different temperatures and using distinct atmospheres to complete cell fabrication. In this review, we summarize recent activity in the field of fabrication and characterization of mT-SOFCs, including the use of mT-SOFCs for steam electrolysis.

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Characterization of NiO–yttria stabilised zirconia (YSZ) hollow fibres for use as SOFC anodes

Cited by 80 publications

References 25 publications

NI/NI‐YSZ Current Collector/Anode Dual Layer Hollow Fibers for Micro‐Tubular Solid Oxide Fuel Cells

NI/NI‐YSZ Current Collector/Anode Dual Layer Hollow Fibers for Micro‐Tubular Solid Oxide Fuel Cells

New Fabrication Techniques for Micro-Tubular Hollow Fiber Solid Oxide Fuel Cells

Fabrication Methods and Performance in Fuel Cell and Steam Electrolysis Operation Modes of Small Tubular Solid Oxide Fuel Cells: A Review

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