Abstract
Atom probe tomography (APT) was utilized to probe composition at the nanoscale across cathode/electrolyte interfaces for anodesupported 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.
| Original language | English |
|---|---|
| Title of host publication | 17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021 |
| Publisher | IOP Publishing Ltd |
| Pages | 1351-1362 |
| Number of pages | 12 |
| Edition | 1 |
| ISBN (Electronic) | 9781607685395 |
| DOIs | |
| State | Published - 2021 |
| Event | 17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021 - Stockholm, Sweden Duration: Jul 18 2021 → Jul 23 2021 |
Publication series
| Name | ECS Transactions |
|---|---|
| Number | 1 |
| Volume | 103 |
| ISSN (Print) | 1938-6737 |
| ISSN (Electronic) | 1938-5862 |
Conference
| Conference | 17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021 |
|---|---|
| Country/Territory | Sweden |
| City | Stockholm |
| Period | 07/18/21 → 07/23/21 |
Funding
This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This project was funded by the United States Department of Energy, National Energy Technology Laboratory, in part, through a site support contract. Neither the United States Government nor any agency thereof, nor any of their employees, nor the support contractor, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.