Journal
ACTA MATERIALIA
Volume 78, Issue -, Pages 271-281Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.06.037
Keywords
Solid oxide fuel cell; Microstructure; Coarsening; Modeling
Funding
- Energy Frontier Research Center on Science Based Nano-Structure Design and Synthesis of Heterogeneous Functional Materials for Energy Systems - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001061]
- NSF-REU EMERGE program at Princeton University [DMR-1156422]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1205734] Funding Source: National Science Foundation
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Recent experimental and theoretical findings suggest that high-temperature solid oxide fuel cells (SOFCs) often suffer from performance degradation due to coarsening of the metallic-phase particles within the anode. In this study, we explore the feasibility of improving the microstructural stability of SOFC anode materials by tuning the contact angle between the metallic phase and electrolyte particles. To this end, a continuum diffuse-interface model is employed to capture the coarsening behavior of the metallic phase and simulate a range of equilibrium contact angles. The evolution of performance-critical, microstructural features is presented for varying degrees of phase wettability. It is found that both the density of electrochemically active triple- phase regions and contiguity of the electron-conducting phase display undesirable minima near the contact angle of conventional SOFC materials. Our results suggest that tailoring the interfacial properties of the constituent phases could lead to a significant increase in the performance and lifetime of SOFCs. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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