Three-Dimensional Analysis of Solid Oxide Fuel Cell Ni-YSZ Anode Interconnectivity

2009 ◽  
Vol 15 (1) ◽  
pp. 71-77 ◽  
Author(s):  
James R. Wilson ◽  
Marcio Gameiro ◽  
Konstantin Mischaikow ◽  
William Kalies ◽  
Peter W. Voorhees ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Electrochemically Active ◽  
Fuel Cell Electrode ◽  
Cell Electrode

AbstractA method is described for quantitatively analyzing the level of interconnectivity of solid-oxide fuel cell electrode phases. The method was applied to the three-dimensional microstructure of a Ni–Y2O3-stabilized ZrO2 (Ni-YSZ) anode active layer measured by focused ion beam scanning electron microscopy. Each individual contiguous network of Ni, YSZ, and porosity was identified and labeled according to whether it was contiguous with the rest of the electrode. It was determined that the YSZ phase was 100% connected, whereas at least 86% of the Ni and 96% of the pores were connected. Triple-phase boundary (TPB) segments were identified and evaluated with respect to the contiguity of each of the three phases at their locations. It was found that 11.6% of the TPB length was on one or more isolated phases and hence was not electrochemically active.

Microstructure and Connectivity Quantification of Complex Composite Solid Oxide Fuel Cell Electrode Three-Dimensional Networks

2010 ◽  
Vol 94 (2) ◽  
pp. 620-627 ◽  
Author(s):  
Danijel Gostovic ◽  
Nicholas J. Vito ◽  
Kathryn A. O'Hara ◽  
Kevin S. Jones ◽  
Eric D. Wachsman
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Three Dimensional ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Fuel Cell Electrode ◽  
Cell Electrode ◽  
Composite Solid

scholarly journals A Multiscale Approach to the Numerical Simulation of the Solid Oxide Fuel Cell

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 253 ◽  
Author(s):  
Marcin Mozdzierz ◽  
Katarzyna Berent ◽  
Shinji Kimijima ◽  
Janusz S. Szmyd ◽  
Grzegorz Brus
Keyword(s):  
Experimental Data ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Multiscale Model ◽  
Solid Oxide ◽  
Correct Prediction ◽  
Multiscale Approach ◽  
Oxide Fuel

The models of solid oxide fuel cells (SOFCs), which are available in the open literature,may be categorized into two non-overlapping groups: microscale or macroscale. Recent progressin computational power makes it possible to formulate a model which combines both approaches,the so-called multiscale model. The novelty of this modeling approach lies in the combination ofthe microscale description of the transport phenomena and electrochemical reactions’ with thecomputational fluid dynamics model of the heat and mass transfer in an SOFC. In this work,the mathematical model of a solid oxide fuel cell which takes into account the averaged microstructureparameters of electrodes is developed and tested. To gain experimental data, which are used toconfirm the proposed model, the electrochemical tests and the direct observation of the microstructurewith the use of the focused ion beam combined with the scanning electron microscope technique(FIB-SEM) were conducted. The numerical results are compared with the experimental data fromthe short stack examination and a fair agreement is found, which shows that the proposed modelcan predict the cell behavior accurately. The mechanism of the power generation inside the SOFC isdiscussed and it is found that the current is produced primarily near the electrolyte–electrode interface.Simulations with an artificially changed microstructure does not lead to the correct prediction of thecell characteristics, which indicates that the microstructure is a crucial factor in the solid oxide fuelcell modeling.

scholarly journals A parametric analysis of thermodynamic losses in an anode of a solid oxide fuel cell

2021 ◽  
Vol 2116 (1) ◽  
pp. 012081
Author(s):  
Tomasz Prokop ◽  
Grzegorz Brus ◽  
Shinji Kimijima ◽  
Janusz Szmyd
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Chemical Reaction ◽  
Parametric Analysis ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Micro Channels ◽  
Fuel Cell Electrode ◽  
Current Conduction ◽  
Cell Electrode

Abstract In this paper, generation of thermodynamic losses in the micro-channels of a Solid Oxide Fuel Cell electrode is discussed. Diffusive-convective equation is implemented to compute local concentrations of reagents. The model accounts for both the Fick’s, and the Knudsen’s diffusion. For a number of cases the total losses are decomposed to isolate the contributions of the diffusion, the current conduction, and the chemical reaction irreversibilities.

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