Abstract
This paper describes 3D tomographic investigations of the structural evolution of Ni-yttria-stabilized zirconia (Ni-YSZ) and (La,Sr)MnO 3-YSZ (LSM-YSZ) composite solid oxide fuel cell (SOFC) electrodes. Temperatures higher than normally used in SOFC operation are utilized to accelerate electrode evolution. Quantitative 3D FIB-SEM and X-ray tomographic imaging contributes to development of mechanistic evolution models needed to accurately predict long-term durability. Ni-YSZ anode functional layers annealed in humidified hydrogen at 900-1,100°C exhibited microstructural coarsening leading to a decrease in three-phase boundary (TPB) density. There was also a change in the fraction of pores that were isolated, which impacted the density of electrochemically active TPBs. The polarization resistance of optimally fired LSM-YSZ electrodes increased upon thermal aging at 1,000°C, whereas that of under-fired electrodes decreased upon aging. These results are explained in terms of observed 3D microstructural changes.
Original language | English (US) |
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Pages (from-to) | 449-454 |
Number of pages | 6 |
Journal | Fuel Cells |
Volume | 13 |
Issue number | 4 |
DOIs | |
State | Published - Aug 2013 |
Funding
Keywords
- Degradation
- Electrode
- SOFC
- Solid Oxide Fuel Cell
- Three Dimensional Tomography
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology