Modeling of Solid Oxide Fuel Cell functionally graded electrodes and a feasibility study of fabrication techniques for functionally graded electrodes

Flesner, Reuben Richard

doi:10.31274/etd-180810-2401

Cited by 3 publications

(5 citation statements)

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“…(31) can generate any grading profile between the linear profile (b ¼ 1) and a concave up profile (Fig. 6 represents concave up profile with orange and red lines) with b ¼ 0.00001 [3,48]. In this study, the grading profile using Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…where i n is the charge transfer current density, i o is the exchange current density, and b is the charge transfer coefficient and has been assumed to be 0.5 in previous modeling works [3, 36,48,62]. The charge transfer coefficient is the fraction of the activation voltage loss that affects the activation energy barrier, and thus the rate of electrochemical transformation.…”

Section: Model Developmentmentioning

confidence: 99%

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Simulation-based microstructural optimization of solid oxide fuel cell for low temperature operation

Abdullah

Liu

2016

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

Simulation-based microstructural optimization of solid oxide fuel cell for low temperature operation

Abdullah

Liu

2016

International Journal of Hydrogen Energy

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“…The solid oxide fuel cell (SOFC) converts chemical energy stored in a fuel (H 2 , CO, CH 4 , etc.) into electricity through an electrochemical reaction (by oxidizing a fuel) with low emissions [17]. SOFC is a sandwich structure composed of a porous oxide-based cathode, a dense ceramic electrolyte and a porous anode [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zirconia doped with naturally mixed rare earths oxides and their electrochemical properties for possible applications in solid oxide fuel cells

Ghiță,

Slobozeanu,

Licu

et al. 2024

Manufacturing Rev.

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Solid oxide fuel cells (SOFC) are electrochemical conversion devices that produces electricity directly from oxidizing a fuel and their development became of high importance to drastically reduce the greenhouse emission. Rare earth elements (REEs) are widely used as materials and dopants in controlling the ionic conductivity of solid electrolytes for SOFCs. Their criticality and high costs for separation to individual REEs lead to first studies aiming to search possible use of mixed REEs with natural occurrence as extracted from concentrates. This paper focused on obtaining sintered pellets based on zirconia doped with natural mixture of REEs extracted from monazite and study their microstructure, impedance spectra and dielectric properties vs. operating temperatures to assess their potential applications as solid electrolyte. ZrO2 doped powders with 8% natural mixture of REEs (8ZrMZ) were synthesized by hydrothermal process. ZrO2 doped with 4% Y2O3 (4ZrY) and 8%Y2O3 (8ZrY) were also obtained by the same route and used as standard materials already used in commercial SOFCs. All powders were uniaxially pressed and sintered in air, with highest densities obtained for 1400 °C. The Niquist diagrams for 8ZrMZ samples show significantly lower ionic conductivity compared to standards 4ZrY and 8 ZrY. This may be attributed to the presence of detrimental Fe and Si impurities following the mixed REE after Th and U removal from monazite concentrates and the ratio of REEs in the dopant composition affecting the ionic conductivity due to possible association of structural defects. Research works are further needed to improve the receipt for using naturally mixed REEs and asses their possible use as a competitive dopant for solid electrolytes.

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“…Various techniques have been investigated by scientists for the fabrication of electrodes, such as tape casting (Song, Park, Lee and Kim, 2008), screen printing (Rotureau, Viricelle, Pijolat, Caillol and Pijolat, 2005), spin coating (Xu, Xia, Huang and Peng, 2005a), tape calendaring (Minh, 2004), thermal plasma spraying (Hui, Wang, Kesler, Rose, Jankovic, Yick, Maric and Ghosh, 2007), electrostatic spray deposition (Nguyen and Djurado, 2001), and spray pyrolysis (Chang, Hsu and Hwang, 2008). These techniques have been summarized and compared in Table 4 (Flesner, 2009). Spray pyrolysis is one of the most cost effective and versatile deposition techniques.…”

Section: Discussionmentioning

confidence: 99%

“…Young's modulus of electrode at different porosities 29 Table 4. Comparison of SOFC fabrication techniques (Flesner, 2009) 40 Table 5. Experimental Matrix Used in the Study 44 Table 6.…”

mentioning

confidence: 99%

Solid oxide fuel cell reliability and performance modeling and fabrication by spray pyrolysis

Liu

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Modeling of Solid Oxide Fuel Cell functionally graded electrodes and a feasibility study of fabrication techniques for functionally graded electrodes

Cited by 3 publications

References 82 publications

Simulation-based microstructural optimization of solid oxide fuel cell for low temperature operation

Simulation-based microstructural optimization of solid oxide fuel cell for low temperature operation

Hydrothermal synthesis of zirconia doped with naturally mixed rare earths oxides and their electrochemical properties for possible applications in solid oxide fuel cells

Solid oxide fuel cell reliability and performance modeling and fabrication by spray pyrolysis

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