Modeling Studies of Tubular SOFCs for Transportation Markets

2013 ◽  
Vol 10 (2) ◽  
Author(s):  
Gianfranco DiGiuseppe ◽  
Naveen K. Honnagondanahalli ◽  
Owen Taylor ◽  
Jeff Dederer
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Cell Voltage ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Fuel Distribution ◽  
Current Densities ◽  
Cell Testing ◽  
The Mathematical Model ◽  
And Diffusion

This paper reports a new 3D isothermal, steady state electrochemical modeling study for tubular solid oxide fuel cells where the testing setup is studied in order to improve fuel distribution and geometry. For the model validation, an experimental voltage-current density curve measured in house was used. This study focuses on the cell testing setup and is used to optimize the testing geometry for improved testing conditions. The mathematical model consists of coupling fluid dynamics, electrical conduction, and diffusion physics. The model indicates that flow mal-distribution may be of concern and may affect cell performance. In addition, concentrations of current densities throughout the solid oxide fuel cell may cause some hot spots. Finally, the model is able to predict the cell voltage-current density of the cell very well when compared to experimental data.

Effect of Bi-Layer Interconnector Design on the Current Density of Solid Oxide Fuel Cells

2009 ◽  
Author(s):  
Qiuyang Chen ◽  
Jian Zhang ◽  
Qiuwang Wang ◽  
Min Zeng
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Porous Electrode ◽  
Solid Oxide ◽  
The Novel ◽  
Oxide Fuel ◽  
Plane Normal ◽  
Three Phase ◽  
Porous Anode

The concentration gradient of fuel and oxidant gas is great in the plane normal to the solid oxide fuel cells (SOFC) three-phase-boundary (TPB) layer, especially in the porous electrode. We present a novel interconnector design, termed bilayer interconnector, for SOFC. It can distribute the fuel and air gas in the plane normal to the SOFC TPB layer. In this paper, we develop a 3D model to study the current density of the SOFC with conventional and novel bi-layer interconnectors. The numerical results show that the novel SOFC design Rib1 can slightly enhance the mass transfer in the porous anode and current density. The novel SOFC design Rib2 can improve the current density significantly under low electrical conductivity of interconnector.

Determination of Factors Governing Degradation of Anode-Supported Solid Oxide Fuel Cells as Influenced by Current Density and Humidity

2021 ◽  
Vol 103 (1) ◽  
pp. 1121-1128
Author(s):  
Riyan Achmad Budiman ◽  
Katherine Develos Bagarinao ◽  
Tomohiro Ishiyama ◽  
Toshiaki Yamaguchi ◽  
Haruo Kishimoto ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Solid Oxide ◽  
Oxide Fuel

Cobalt oxide enhanced lanthanum strontium cobalt ferrite electrode for solid oxide fuel cells

2021 ◽  
pp. 1-13
Author(s):  
Alberto Olivo ◽  
Berceste Beyribey ◽  
Hwan Kim ◽  
Joshua Persky
Keyword(s):  
Charge Transfer ◽  
Solid Oxide Fuel Cells ◽  
Charge Transfer Resistance ◽  
Solid Oxide ◽  
Co3o4 Nanoparticles ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Oxide Fuel ◽  
Transfer Resistance ◽  
And Diffusion

A Co3O4 enhanced La0.8Sr0.2Co0.5Fe0.5O3 - δ (LSCF) electrode is developed for use in air electrodes with proton conducting solid oxide fuel cell (SOFC). The incipient wetness impregnation method enables Co3O4 nanoparticles on the LSCF surface without altering the bulk porosity of the LSCF electrode. The polarization resistance of LSCF electrodes is significantly reduced by Co3O4 doping, and both charge transfer and diffusion/conversion resistances were positively affected. The highest reduction in charge transfer resistance is obtained at 700 °C, which is increased from 21%to 32%through reduction of po 2. Conversely, the highest reduction in diffusion/conversion resistance is achieved at 550 °C. By increasing po 2, the reduction is increased from 57%to 66%and its activation energy is reduced up to 33 %compared to pure LSCF. The lowest total area specific resistances obtained under air are 1.45 Ω·cm2, 2.95 Ω·cm2, 6.75 Ω·cm2 and 16.45 Ω·cm2 at 700 °C, 650 °C, 600 °C and 550 °C, respectively.

Determination of Factors Governing Degradation of Anode-Supported Solid Oxide Fuel Cells as Influenced by Current Density and Humidity

2021 ◽  
Vol MA2021-03 (1) ◽  
pp. 73-73
Author(s):  
Riyan Achmad Budiman ◽  
Katherine Develos Bagarinao ◽  
Tomohiro Ishiyama ◽  
Toshiaki Yamaguchi ◽  
Haruo Kishimoto ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Solid Oxide ◽  
Oxide Fuel

A Multiphysics Modeling Study of (Pr0.7Sr0.3)MnO3±δ∕8mol% Yttria-Stabilized Zirconia Composite Cathodes for Solid Oxide Fuel Cells

2004 ◽  
Vol 2 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Ke An ◽  
Kenneth L. Reifsnider
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Before And After

Solid oxide fuel cells (SOFCs) are expected to be a future power source. Simulation analyses of SOFCs can help to understand well the interactive functions among the multiphysics phenomena in the SOFC system. A three-dimensional multiphysics finite-element model was used to simulate the performance of a half-cell SOFC with (Pr0.7Sr0.3)MnO3±δ∕8mol% yttria-stabilized zirconia (8YSZ) composite cathode on one side of the 8YSZ electrolyte before and after aging. Multiphysics phenomena in the SOFC were considered in the modeling. The current/voltage curves simulated matched the experimental data before and after aging. The average current density was found to have a linear relationship to the logarithm of the effective exchange current density. The effect of the effective ionic conductivity of the composite cathode was more apparent for small total effective ionic conductivity values than for large ones.

Oscillation Phenomenon of the Cell Performance for an Anode-Supported Solid Oxide Fuel Cell with a Low-Porosity/High-Thickness Anode Structure

2015 ◽  
Vol 656-657 ◽  
pp. 124-128 ◽  
Author(s):  
Wei Xin Kao ◽  
Tai Nan Lin ◽  
Yang Chuang Chang ◽  
Maw Chwain Lee
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Current Density ◽  
Concentration Polarization ◽  
Cell Voltage ◽  
Solid Oxide ◽  
Constant Current ◽  
Oxide Fuel ◽  
Oscillation Phenomenon ◽  
Low Porosity

The anode-supported solid oxide fuel cell (SOFC) with low-porosity anode structure is fabricated and the electrochemical characteristics are investigated. The electrochemical characterization of the cell shows a periodic oscillation phenomenon of the cell voltage under the constant current density operation. The low-porosity anode structure results in the decrease in the effective diffusion coefficient and the accumulation of water vapor. The cell voltage oscillation is mainly caused by the concentration polarization as well as the boundary migration of the reaction zone. The profound influence on the concentration polarization can be observed when the cell test is executed with operation condition of higher current density, lower hydrogen concentration, and lower hydrogen flow rate in the anode side.

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