Numerical simulation of the performance of solid oxide fuel cell with different flow channel geometries

Khazaee, Iman; Rava, Amin

doi:10.1016/j.energy.2016.12.074

Cited by 113 publications

(53 citation statements)

References 19 publications

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“…where E act and k e are activation energy (137 kJ/mol for the cathode, 140 kJ/mol for the anode) and pre-exponential factor (2.35 × 10 11 for the cathode, 6.54 × 10 11 for the anode), respectively. The exchange current density was calculated using the above equation with validated data from [29].…”

Section: Electrochemistrymentioning

confidence: 99%

Effect of Electrolyte Thickness on Electrochemical Reactions and Thermo-Fluidic Characteristics inside a SOFC Unit Cell

et al. 2018

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We investigated the effect of electrolyte thickness and operating temperature on the heat and mass transfer characteristics of solid oxide fuel cells. We conducted extensive numerical simulations to analyze single cell performance of a planar solid oxide fuel cell (SOFC) with electrolyte thicknesses from 80 to 100 µm and operating temperatures between 700 • C and 800 • C. The commercial computational fluid dynamics (CFD) code was utilized to simulate the transport behavior and electrochemical reactions. As expected, the maximum power density increased with decreasing electrolyte thickness, and the difference became significant when the current density increased among different electrolyte thicknesses at a fixed temperature. Thinner electrolytes are beneficial for volumetric power density due to lower ohmic loss. Moreover, the SOFC performance enhanced with increasing operating temperature, which substantially changed the reaction rate along the channel direction. This study can be used to help design SOFC stacks to achieve enhanced heat and mass transfer during operation.

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Section: Electrochemistrymentioning

confidence: 99%

Effect of Electrolyte Thickness on Electrochemical Reactions and Thermo-Fluidic Characteristics inside a SOFC Unit Cell

et al. 2018

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“…For large area anode supported cells, performance tests are usually conducted in a gas channel‐type setup, and in many cases their performance is inferior compared to that of a small cell. The performance of the planar large cell strongly depends on the gas channel design and operating conditions such as the gas flow rate (fuel utilization) . This is due to non‐uniform gas‐phase transport over a large area anode surface, which consequently creates a locally varied performance on the cell .…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of In‐plane Performance Variation on Anode Supported Solid Oxide Fuel Cells Using Segmented Cathodes and Reference Electrodes

et al. 2020

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In this study, planar anode-supported solid oxide fuel cells (5 5 cm 2 ) were fabricated with cathode segmentations and tested in a channel type setup. The in-plane performance variation became significant with an increasing current density (fuel utilization), and impedance analysis on each segment indicated that the poor performance in the outlet region was due to gas conversion overpotential combined with gas concentration overpotential. Pt reference electrodes were embedded in the electrolyte layers of the segments so that the anode and cathode overpotential could be separated for each segment. It was found that the cathode overpotential was dominant for both segments, which suggested that the cathode overpotential determined the overall cell performance. On the other hand, the anode overpotential was responsible for the in-plane performance variation. Post-analysis revealed that the Ni anode was partially oxidized and its layer was delaminated in the outlet region. Thus, this study suggests that the anode overpotential related to gas conversion is a critical factor in determining Ni anode stability as well as overall cell performance in planar anode supported cells with a gas channel setup.

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“…Another assumption made regarding heat-transfer problem in SOFC modeling is that local temperature equilibrium (LTE) approach is used to solve the temperature change within a single stack. This approach assumes that the temperature of the solid and gas phases within the electrodes are locally the same [35], [36]. The succeeding section discusses the boundary conditions commonly required to model an SOFC stack.…”

Section: Assumptions In Sofc Modelingmentioning

confidence: 99%

A short review on the modeling of solid-oxide fuel cells by using computational fluid dynamics: assumptions and boundary conditions

Aman

Muchtar²,

Somalu

et al. 2018

IJIE

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Performance tests are vital for the development of solid-oxide fuel cells (SOFCs) and can help determine the potential of developed SOFCs. However, the challenges in performing these tests such as cost, time, and safety limit the development of SOFCs. Computational fluid dynamics (CFD) can be used to numerically predict the performance of developed SOFCs. CFD methods enable the exploration of many design and operational parameters that are difficult to assess experimentally. This paper focuses on the assumptions and boundary conditions used to model the SOFC stack by using a CFD method. Through the discussions, we briefly explain several assumptions that are commonly found in SOFC modeling. These assumptions are important because they can influence the modeling processes and parameters required for simulations. The boundary conditions required for SOFC modeling are then described to provide an overview on how SOFC operations are incorporated into the model and simulations. Our results can help elucidate the significance of assumptions and boundary conditions used in the CFD modeling of SOFCs

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Numerical simulation of the performance of solid oxide fuel cell with different flow channel geometries

Cited by 113 publications

References 19 publications

Effect of Electrolyte Thickness on Electrochemical Reactions and Thermo-Fluidic Characteristics inside a SOFC Unit Cell

Effect of Electrolyte Thickness on Electrochemical Reactions and Thermo-Fluidic Characteristics inside a SOFC Unit Cell

Experimental Investigation of In‐plane Performance Variation on Anode Supported Solid Oxide Fuel Cells Using Segmented Cathodes and Reference Electrodes

A short review on the modeling of solid-oxide fuel cells by using computational fluid dynamics: assumptions and boundary conditions

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