Effects of pressurization and temperature on power generating characteristics and impedances of anode-supported and electrolyte-supported planar solid oxide fuel cells

Hsieh, Yu-Lin; Chan, Y.H.; Shy, S.S.

doi:10.1016/j.jpowsour.2015.08.080

Cited by 32 publications

(10 citation statements)

References 20 publications

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“…4c and is confirmed by the Bode plot in Fig. 4a which shows a difference in impedance at high frequency (~100 Hz) and is attributable to changes in the cathode activation polarization with temperature variation [41].…”

Section: Resultsmentioning

confidence: 55%

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Micro-tubular flame-assisted fuel cell stacks

Milcarek

Garrett

Ahn

2016

International Journal of Hydrogen Energy

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Similar to the original direct flame fuel cell the flame-assisted fuel cell, which has a solid oxide fuel cell (SOFC) operating in combustion exhaust, can potentially simplify the fuel cell system and has applications in micro-Combined Heat and Power. Development and testing of a 9 microtubular flame-assisted fuel cell stack is demonstrated in this work. Two different systems are investigated having 1) fixed fuel flow rate and varying air flow rate and 2) fixed total flow rate of air and fuel for the micro-Combined Heat and Power burners. The micro-tubular flame-assisted fuel cell stack achieves a significant performance of 237 mW cm -2 in model methane combustion exhaust at 0.5 V and 790⁰C with a lanthanum strontium manganite based cathode. Electrochemical impedance spectroscopy reveals that the fuel cell ohmic losses are unaltered by variations in the exhaust species concentrations while the polarization losses increase with decreasing first-stage combustion fuel-air equivalence ratio. Variations in the combustion exhaust temperature effects both the ohmic and polarization losses.

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Section: Resultsmentioning

confidence: 55%

“…A significant difference is noted in the impedance at low frequencies in the Bode plot (Fig. 4a), which is attributable to diffusion processes in the anode [41]. This results in higher total resistance as the combustion equivalence ratio decreases.…”

Section: Resultsmentioning

confidence: 96%

Micro-tubular flame-assisted fuel cell stacks

Milcarek

Garrett

Ahn

2016

International Journal of Hydrogen Energy

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“…The polarization resistance also showed a slight increase in polarization resistance as the buffer layer thickness exceeds the optimal ∼1.7 μm (105 layers of SDC sprayed). Differences in the cathode activation polarization are typically observed at high frequency (∼100 Hz) [55]. The mT-SOFC with 15 layers of SDC sprayed has higher impedance compared with 45 layers of SDC sprayed near 100 Hz, which indicates that a change in cathode activation polarization is also occurring as a result of increasing the buffer layer thickness.…”

Section: Resultsmentioning

confidence: 99%

Micro-Tubular Solid Oxide Fuel Cell Polarization and Impedance Variation With Thin Porous Samarium-Doped Ceria and Gadolinium-Doped Ceria Buffer Layer Thickness

Milcarek

Ahn

2020

Journal of Electrochemical Energy Conversion and Storage

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Abstract Porous buffer layers for anode-supported solid oxide fuel cells (SOFCs) have been investigated for many years with different thicknesses of the buffer layer in each study. In this work, micro-tubular SOFCs having samarium-doped ceria (SDC) and gadolinium-doped ceria (GDC) buffer layers are compared using the current-voltage technique, electrochemical impedance spectroscopy, scanning electron microscopy and energy dispersive x-ray spectroscopy. The thickness of the porous SDC and GDC buffer layer is investigated systematically with the thickness varying between 0.3–2.0 µm. The power density varies between 212 and 1,004 mW.cm−2 for samples having different SDC buffer layer thickness. Comparable changes occur for the SOFCs with a GDC buffer layer, but less variation in polarization losses resulted. Variation in electrochemical performance varies due to changes in ohmic resistance, cathode activation polarization, and interfacial reactions between the cathode and electrolyte materials.

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“…Cell performance of anode-supported and electrolyte-supported SOFCs under varying operating temperature and pressure was experimentally investigated by Hsieh et al [10]. The cell performance was significantly improved with increasing operating temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Analysis of heat and mass transport characteristics in anode-supported solid oxide fuel cells at various operating conditions

Shen

Yang

et al. 2019

Numerical Heat Transfer, Part A: Applications

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In this study, the heat and mass transport characteristics of anode-supported solid oxide fuel cells (SOFCs) are numerically investigated by using a twodimensional model. The mathematical model is validated by comparing the numerical results with experimental data found in the open literature. The species and temperature distributions of SOFCs at different cell voltages are presented and compared. Effects of operating temperature, flow direction arrangement, and flow velocity on the overall cell performance and local temperature distribution are also analyzed. It is concluded that the local temperature is increased with decreasing operating cell voltage, increasing operating temperature, and decreasing cathode flow velocity. The temperature distribution is significantly changed when counter-flow arrangement is used instead of coflow arrangement. In addition, the effect of anode flow velocity on temperature distribution is negligible. ARTICLE HISTORY

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Effects of pressurization and temperature on power generating characteristics and impedances of anode-supported and electrolyte-supported planar solid oxide fuel cells

Cited by 32 publications

References 20 publications

Micro-tubular flame-assisted fuel cell stacks

Micro-tubular flame-assisted fuel cell stacks

Micro-Tubular Solid Oxide Fuel Cell Polarization and Impedance Variation With Thin Porous Samarium-Doped Ceria and Gadolinium-Doped Ceria Buffer Layer Thickness

Analysis of heat and mass transport characteristics in anode-supported solid oxide fuel cells at various operating conditions

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