Study of the Rate Limiting Step of the Cathodic Process in Anode Supported Solid Oxide Fuel Cell

2008 ◽  
Vol 5 (1) ◽  
Author(s):  
M. P. Carpanese ◽  
G. Cerisola ◽  
M. Viviani ◽  
P. Piccardo ◽  
D. Vladikova ◽  
...  
Keyword(s):  
Impedance Analysis ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Half Cell ◽  
Pure Material ◽  
Additional Information ◽  
Ysz Electrolyte

The oxygen reduction (OR) mechanism at the Sr-doped LaMnO3 (LSM) and yttria stabilized zirconia (YSZ) composite cathode for high temperature solid oxide fuel cells is still uncertain, despite of the great deal of work carried out over the last years about this system. In previous works, we tested a half-cell (with a YSZ electrolyte pellet) in a typical three-electrode configuration: It was observed that the portion of the composite cathode volume involved in the reaction depends on the operating temperature. Moreover, we analyzed part of the impedance data by the differential impedance analysis, which does not need a preliminary working hypothesis. The results suggested that significant limitations in the oxygen ion transport occur in the LSM pure material, which are not observed in the composite YSZ/LSM cathode. In this study, we investigate the behavior of the LSM/YSZ system in a Ni/YSZ cermet anode-supported half-cell with yttria stabilized zirconia (8YSZ) electrolyte and a screen printed LSM/YSZ composite cathode. The aim is to individuate and characterize the cathodic contribution from the overall impedance response, varying the partial pressure of the reactant gases, to obtain additional information about the OR mechanism from the p(O2) dependence. By a possible interpretation of the oxygen reaction mechanism, a comparative study of the cathode behavior with previous results is performed.

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.

scholarly journals Direct application of cobaltite-based perovskite cathodes on the yttria-stabilized zirconia electrolyte for intermediate temperature solid oxide fuel cells

2016 ◽  
Vol 4 (45) ◽  
pp. 17678-17685 ◽  
Author(s):  
Kongfa Chen ◽  
Na Li ◽  
Na Ai ◽  
Meng Li ◽  
Yi Cheng ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Direct Application ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Zirconia Electrolyte ◽  
Ysz Electrolyte

Cobaltite based perovskites can be directly applied on the YSZ electrolyte via an in situ polarization induced electrode/electrolyte interface.

Solid Oxide Fuel Cell PEN Structures Fabricated by Tape Casting and Co-Firing Technologies

2007 ◽  
Vol 280-283 ◽  
pp. 759-762
Author(s):  
He Ping Zhou ◽  
Zhi Hui Liu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Tape Casting ◽  
Sem Analysis ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Electrolyte Film ◽  
Ysz Electrolyte

Solid oxide fuel cell positive-electrolyte-negative (SOFC PEN) structures were fabricated by complex tape casting and co-firing technologies. La0.8Sr0.2FeO3 (LSF20) powders for cathode and 8 mol% yttria-stabilized zirconia (YSZ) powders for electrolyte were synthesized through glycine-nitrate process (GNP). The slurries for cathode, electrolyte and anode (NiO-YSZ) were cast in sequence to form green PEN structures. Co-fired at 1200oC for 6 h, there were no delamination, crack or curl occurred in PEN structures. SEM analysis showed that YSZ electrolyte film had been sintered to full dense and the interface combinations were compact. No evident reaction product between YSZ and LSF20 was detected by XRD.

Fabrication and evaluation of solid-oxide fuel cell anodes employing reaction-sintered yttria-stabilized zirconia

2009 ◽  
Vol 193 (2) ◽  
pp. 706-712 ◽  
Author(s):  
Daniel Storjohann ◽  
James Daggett ◽  
Neal P. Sullivan ◽  
Huayang Zhu ◽  
Robert J. Kee ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Fuel Cell Anodes
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