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Title: Phase field modeling of microstructure evolution and concomitant effective conductivity change in solid oxide fuel cell electrodes

Journal Article · · Journal of Power Sources
ORCiD logo [1];  [2];  [1]
  1. National Energy Technology Lab., Albany, OR (United States)
  2. National Energy Technology Lab., Albany, OR (United States); AECOM, Albany, OR (United States)

Microstructure evolution plays an important role in the performance degradation of SOFC electrodes. In this work, we propose a much improved phase field model to simulate the microstructure evolution in the electrodes of solid oxide fuel cell. We demonstrate that the tunability of the interfacial energy in this model has been significantly enhanced. Parameters are set to fit for the interfacial energies of a typical Ni-YSZ anode, an LSM-YSZ cathode and an artificial reference electrode, respectively. The contact angles at various triple junctions and the microstructure evolutions in two dimensions are calibrated to verify the model. As a demonstration of the capabilities of the model, three dimensional microstructure evolutions are simulated applying the model to the three different electrodes. The time evolutions of grain size and triple phase boundary density are analyzed. In addition, a recently proposed bound charge successive approximation algorithm is employed to calculate the effective conductivity of the electrodes during microstructure evolution. Furthermore, the effective conductivity of all electrodes are found to decrease during the microstructure evolution, which is attributed to the increased tortuosity and the loss of percolated volume fraction of the electrode phase.

Research Organization:
National Energy Technology Lab. (NETL), Albany, OR (United States); Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
OSTI ID:
1343950
Alternate ID(s):
OSTI ID: 1415678
Report Number(s):
NETL-PUB 20806
Journal Information:
Journal of Power Sources, Vol. 345, Issue C; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (2)

Performance Degradation Predictions Based on Microstructural Evolution Due to Grain Coarsening Effects in Solid Oxide Fuel Cell Electrodes journal January 2018
Investigation of LSM-YSZ Composite Cathode Performance Degradation with a Multistep Charge Transfer Model journal January 2019