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Nanoscale Analysis of LSM/YSZ Interfaces within Composite Cathodes for Commercial Solid Oxide Fuel Cells

Journal Article · · ECS Transactions
 [1];  [2];  [3];  [3]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  3. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
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In this study, atom probe tomography (APT) was utilized to probe composition at the nanoscale across cathode/electrolyte interfaces for anode-supported commercial SOFCs. These SOFCs contained a porous composite cathode layer, consisting of sintered (La0.8Sr0.2)0.95MnO3 (LSM) and yttria-stabilized zirconia (YSZ). SOFCs were operated up to a 500 h duration at a 0.75 A/cm2 current density and 800°C. The measured cell voltage increased over the first 100 hours of operation, followed by a steady and linear drop in cell voltage that translated to a 5.35% performance loss per 1000 h. Cation migration behavior was extrapolated through comparisons of compositional profiles acquired by APT across LSM/YSZ particle interfaces for as-sintered, operated, and thermally aged conditions. The results show that operation drives La/Sr away from the LSM nanoparticle surface and Y depletion at the YSZ nanoparticle surface. Energy dispersive spectroscopy (EDS) inside a scanning transmission electron microscope (STEM) provided additional insights regarding Mn aggregation behavior during operation.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Carnegie Mellon University; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1817432
Alternate ID(s):
OSTI ID: 1844391
Journal Information:
ECS Transactions, Journal Name: ECS Transactions Journal Issue: 1 Vol. 103; ISSN 1938-5862
Publisher:
Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE