Microstructure and polarization characteristics of anode supported tubular solid oxide fuel cell with co-precipitated and mechanically mixed Ni-YSZ anodes

Shikazono, Naoki; Sakamoto, Yusuke; Yamaguchi, Yohei; Kasagi, Nobuhide

doi:10.1016/j.jpowsour.2009.04.031

Cited by 38 publications

(30 citation statements)

References 27 publications

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“…The electrochemical performance of the cell thus increased considerably as a result of the improved microstructure. In addition, the maximum power densities obtained for the present micro-tubular SOFC are competitive with those of conventional anode-supported micro-tubular SOFCs produced using similar materials [40,45,46]. This suggests that despite the presence of more cell layers in the inert support-based micro-tubular design, microstructure engineering helps to achieve promising electrochemical performance without incurring additional losses from a gas diffusion or reaction kinetics point of view.…”

Section: Resultsmentioning

confidence: 74%

Performance improvement and redox cycling of a micro-tubular solid oxide fuel cell with a porous zirconia support

Panthi

Choi

Tsutsumi

2015

International Journal of Hydrogen Energy

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Microstructure PorosityRedox cycling a b s t r a c tThe performance of a novel micro-tubular solid oxide fuel cell (SOFC) with an inert support and an integrated current collector for the inner electrode was improved by controlling its microstructural features. Multi-step dip coating and co-sintering methods were used to fabricate the cell containing porous yttria-stabilized zirconia (YSZ), Ni, NieYSZ, YSZ, strontium-doped lanthanum manganite (LSM)eYSZ, and LSM as the inert support, anode current collector, anode, electrolyte, cathode, and cathode current collector, respectively.To enhance gas diffusion through the YSZ support by properly tailoring its porosity, a combination of micro-crystalline cellulose and polymethyl methacrylate pore formers was used. Additionally, the porosity of the Ni current collector was improved and the LSMeYSZ cathode was sufficiently thick for high oxygen reduction activity. Owing to its optimized microstructure, the micro-tubular SOFC delivered excellent power output with maximum power densities of 710, 591, 445, and 316 mW cm À2 at 850, 800, 750, and 700 C, respectively.The effect of redox cycling on cell performance was investigated by alternately exposing the anode to fuel and air atmospheres. The cell had good tolerance toward the redox phenomenon with no apparent degradation in its performance up to 10 redox cycles.

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Section: Resultsmentioning

confidence: 74%

Performance improvement and redox cycling of a micro-tubular solid oxide fuel cell with a porous zirconia support

Panthi

Choi

Tsutsumi

2015

International Journal of Hydrogen Energy

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“…Finally, the effect of the level of grid surface refinement (octree, cut-cell, etc.) on the results is investigated for random porous media with polydisperse particle size distributions available in the literature [40,51].…”

Section: Numerical Resultsmentioning

confidence: 99%

Effective transport properties of the porous electrodes in solid oxide fuel cells

Choi

Berson

Pharoah

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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This article presents a numerical framework for the computation of the effective transport properties of solid oxide fuel cells (SOFCs) porous electrodes from three-dimensional (3D) constructions of the microstructure. Realistic models of the 3D microstructure of porous electrodes are first constructed from measured parameters such as porosity and particle size distribution. Then each phase in the model geometries is tessellated with a computational grid. Three different types of grids are considered: Cartesian, octree, and body-fitted/cut-cell with successive levels of surface refinement. Finally, a finite volume method is used to compute the effective transport properties in the three phases (pore, electron, and ion) of the electrode. To validate the numerical approach, results obtained with the finite volume method are compared to those calculated with a random walk simulation for the case of a body-centred cubic lattice of spheres. Then, the influence of the sample size is investigated for random geometries with monosized particle distributions. Finally, effective transport properties are calculated for model geometries with polydisperse particle size distributions similar to those observed in actual SOFC electrodes.

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“…In the present study, a GDC specimen with a 97% relative density was obtained using the carbonate-derived GDC powders even at 1200 C. However, the shrinkage mismatch between the NieYSZ and GDC due to the additional shrinkage of the NieYSZ support above 1200 C led to the formation of surface cracks and pores in the GDC electrolytes sintered at 1300 and 1350 C. The shrinkage of the NieYSZ support can be tuned by proper control of the Ni particle sizes [51], YSZ particle sizes [52], sintering additives [53], pore former [54] and pre-sintering temperature [36] of the NieYSZ green body. A GDC specimen with a 95% relative density could be obtained at a sintering temperature as low as 1050 C by using the GDC powders calcined at 700 C. Accordingly, the co-firing temperature of the tubular cell in the present study may be decreased down to 1050 C if the shrinkage of the NieYSZ support can be controlled.…”

Section: Resultsmentioning

confidence: 99%

Intermediate-temperature nickel–yttria stabilized zirconia supported tubular solid oxide fuel cells using gadolinia-doped ceria electrolyte

Park

Ahn

et al. 2012

Journal of Power Sources

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Microstructure and polarization characteristics of anode supported tubular solid oxide fuel cell with co-precipitated and mechanically mixed Ni-YSZ anodes

Cited by 38 publications

References 27 publications

Performance improvement and redox cycling of a micro-tubular solid oxide fuel cell with a porous zirconia support

Performance improvement and redox cycling of a micro-tubular solid oxide fuel cell with a porous zirconia support

Effective transport properties of the porous electrodes in solid oxide fuel cells

Intermediate-temperature nickel–yttria stabilized zirconia supported tubular solid oxide fuel cells using gadolinia-doped ceria electrolyte

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