Electrochemical Frequency Modulation for Estimating Exchange Current Density in Solid Oxide Fuel Cells

2016 ◽  
Vol 72 (7) ◽  
pp. 173-181
Author(s):  
D. Das ◽  
D. M. Hall ◽  
S. N. Lvov
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Frequency Modulation ◽  
Solid Oxide ◽  
Exchange Current ◽  
Exchange Current Density ◽  
Oxide Fuel

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

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.

A Modeling Study of the Effect of Cathode Delamination on SOFC Performance

2008 ◽  
Author(s):  
Gianfranco DiGiuseppe ◽  
Gladys Morin Licon
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Significant Role ◽  
Current Density ◽  
New Technology ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Commercial Market ◽  
Voltage Degradation

In this paper cathode delamination is studied in order to better understand its effect on the electrochemical performance of planar solid oxide fuel cells (SOFCs). In recent published work cathode delamination has been suggested to play a significant role in voltage degradation. Voltage degradation has challenged this new technology in recent years and has prevented SOFC systems to enter the commercial market except for a few prototypes. The objective of this work is to quantify the effect of cathode delamination on the cell electrochemical performance. This study will better elucidate the delamination problem which will in turn inspire more work to improve cathode adhesion by modifying the cathode properties. Modeling results indicate that the SOFC performance is affected if the cathode cannot maintain a good attachment with the SOFC assembly. Voltage-current density curves indicate that the performance of the SOFC declines as the percentage of the separation increases. Therefore a portion of the observed voltage degradation could be attributed to the delamination of the cathode.

Characterization of Anode-Supported Solid Oxide Fuel Cells With Nd2NiO4 Cathodes

2009 ◽  
Vol 6 (4) ◽  
Author(s):  
V. A. C. Haanappel ◽  
C. Lalanne ◽  
A. Mai ◽  
F. Tietz
Keyword(s):  
Grain Size ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Gas Diffusion ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Sintering Conditions ◽  
Diffusion Problems

A systematic study was initiated of anode-supported solid oxide fuel cells (SOFCs) with Nd2NiO4 cathodes. This type of cathode, a mixed conducting K2NiF4-type material, can be considered as a candidate for SOFC applications. In this study, the influence of (1) the presence of a Ce0.8Gd0.2O1.9 (CGO) interlayer between the electrolyte and the cathode, (2) sintering conditions, and (3) the grain size of the powder on the performance of SOFCs with Nd2NiO4 cathodes was investigated in more detail. Results from current density-voltage characteristics and permeation and gas diffusion measurements showed that the electrochemical performance was promising for SOFCs including a CGO interlayer and a Nd2NiO4 cathode (prepared with a powder with a d50 of 0.5A∕cm2 or 0.8μm) sintered at 1100°C or higher; current density at 800°C and 700mV between 1.2 and 1.3A∕cm2. The microstructure of the cathode was such that no gas diffusion problems occurred.

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